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KROQ

KROQ

KROQ-FM is a commercial rock and roll music radio station in Los Angeles, California, broadcasting on 106.7 FM. The call sign is pronounced "kay rock." The first station with the call letters KROQ was formed in 1972, broadcasting on 1500 AM, with a format of Top 40 hits. In 1973 KROQ bought the station KPPC 106.7 FM, which had been broadcasting rock and roll since 1968. The FM station became KROQ-FM. The two stations broadcasted identical programing through 1978, when the AM station was sold. In 1986, KROQ was purchased by Infinity Broadcasting, a subsidiary of Viacom. KROQ plays alternative, new wave, nu metal, and indie artists. In 2004, KROQ began broadcasting in High Definition Radio for a higher quality broadcast.

Personalities

Present


- Kevin and Bean (Weekday morning show, 5-10am: hosts)
- Doc on the 'ROQ (Weekday morning show: news)
- Ralph Garman (Weekday morning show: movies, celebrity voices)
- Lisa May (Weekday morning show)
- Dean Shefron (Weekday morning show: sports)
- Kat Corbett (Weekdays 10am-1pm)
- Jed the Fish (Weekdays 1-4pm)
- Stryker (Monday to Thursday 4-7pm, and Friday)
- Nicole Alvarez (Weekdays 7-10pm)
- Adam Carolla and Dr. Drew (syndicated Loveline, weeknights 10pm-12am)
- John Michael (Weekends)
- Scott Mason (KROQ) ( Sunday AM's)
- Jason Bentley (Saturday 12am-3am)
- Rodney Bingenheimer (Monday 12am-3am)
- Doug the Slug aka Sluggo (various)
- Jack Blades (Weekends)

Past


- Raymond Banister aka Ramondo (1980-mid 90s)
- Dave Baxter aka Big Dave the KROQ Van Man (1989-1993)
- Richard Blade (1982-2000)
- Carson Daly (1996)
- Dr. Demento (1970-71)
- Raechel Donahue (1984-86)
- Mike Evans (1980-82, 1984-89)
- Sam Freeze (1982-85)
- Ken Fusion (1982-90)
- Tami Heide (1991-2004)
- Van Johnson (1986-91)
- Jimmy Kimmel (1994-99)
- Lewis Largent (1986-93)
- John Logic (1982-86)
- Katy Manor (1983-89)
- Spacin' Scott Mason (1980s)
- Money (1994-2005)
- Mr. Hand (1991)
- Riki Rachtman (1993-96)
- Robert Roll (1981-85)
- Frazer Smith (1976-80)
- Freddy Snakeskin (1980-90, 1992-94)
- Sly Stone ('70s)
- Dusty Street (1979-89)
- Swedish Egil (1983-90)
- Jim Trenton ("The Poorman") (1982-93)
- "Insane" Darryl Wayne (1976-81)
- Denise Westwood (1980-82)
- April Whitney (1978-87, 1990-94)
- Larry Woodside (1980-81)
- The Young Marquis and Stanley (1977-83)

Concerts and communities


- KROQ Acoustic Christmas, first aired in December 1990
- KROQ Top 106.7 Countdowns, first aired in December 1980 - on New Year's Eve every year, they do top 106.7 songs for the year
- KROQ Weenie Roast, first aired in June 1993
- KROQ Inland Invasion, first aired in September 2000

KROQ-related albums


- [http://www.allmusic.com/cg/amg.dll?p=amg&sql=10:yxddyl5jxppb~T00 Rodney on the ROQ, Vol. 1] a classic punk compilation from KROQ's Rodney Bingenheimer.
- [http://www.allmusic.com/cg/amg.dll?p=amg&sql=10:u1ge4jj70waw~T00 Rodney on the ROQ, Vol. 2] more good punk from KROQ's Rodney Bingenheimer.
- [http://www.allmusic.com/cg/amg.dll?p=amg&sql=10:7gy67uy0h0j0~T00 Rodney on the ROQ, Vol. 3] even more punk from KROQ's Rodney Bingenheimer.
- 2005 KROQ New Music, a collection of new singles that were premiered in 2004.
- At KROQ, a CD-single by Morrissey.
- On KROQ's Loveline, CD by Hagfish
- The Best of KROQ's Almost Acoustic Christmas, a compilation of concerts recorded at the Acoustic Christmas.
- Time Bomb Recordings Kroq: B.O. Acoustic Christmas
- Kevin & Bean Present Fo' Shizzle St. Nizzle (2002)
- Kevin & Bean Present Swallow My Eggnog (2001)
- Kevin & Bean: The Real Slim Santa (2000)
- Kevin & Bean's Last Christmas (1999)
- Kevin & Bean: Santa's Swingin Sack (1998)
- Kevin & Bean: A Family Christmas In Your Ass (1997)

External links


- [http://www.kroq.com/ Official Website]
- [http://www.rocklists.com/kroq.html Complete countdown list of KROQ songs (1980-present)]
- [http://www.geocities.com/SiliconValley/1008/kroqhist.html History of KROQ 1968-1979]
- [http://earlhoward.com/kroq.htm History of KROQ 1980-1990]
- [http://www.kroqclassics.com/ KROQ Classics] Webcast - A Tribute to KROQ 1980-1990
- [http://www.radiohitlist.com List of KROQ Top 106.7 countdowns with a searchable archive]
- [http://www.findarticles.com/cf_dls/m1346/11_46/79396173/p1/article.jhtml KROQ: an oral history] Article from November 2001 Los Angeles Magazine.
- [http://myspace.com/KROQ KROQ] or [http://www.myspace.com/worldfamouskroq World Famous] @ MySpace
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ROQ title article ROQ ko:KROQ

Rock and roll

:For other uses of "rock and roll", see Rock and roll (disambiguation). Rock and roll (also spelled rock 'n' roll, especially in its first decade), is a genre of music that emerged as a defined musical style in American South in the 1950s, and quickly spread to the rest of the country, and the world. From the late 1950s to the mid 1990s rock was perhaps the most popular form in music in the western world. It later evolved into the various different sub-genres of what is now called simply 'rock'. As a result, "rock and roll" now has two distinct meanings: either traditional rock and roll in the 1950s style, or later rock and even pop music which may be very far from traditional rock and roll (rhythm sample).

Precursors and origins

Main article: Origins of rock and roll Rock and roll emerged as a defined musical style in America in the 1950s, though elements of rock and roll can be heard in rhythm and blues records as far back as the 1920s. Early rock and roll combined elements of blues, boogie woogie, jazz and rhythm and blues, and is also influenced by traditional Appalachian folk music, gospel and country and western. Going back even further, rock and roll can trace a foundational lineage to the old Five Points district of mid-19th century New York City, the scene of the first fusion of heavily rhythmic African shuffles and sand dances with melody driven European genres, particularly the Irish jig. Rocking was a term first used by black gospel singers in the American South to mean something akin to spiritual rapture. By the 1940s, however, the term was used as a double entendre, ostensibly referring to dancing, but with the hidden subtextual meaning of sex; an example of this is Roy Brown's "Good Rocking Tonight". This type of song was usually relegated to "race music" (the music industry code name for rhythm and blues) outlets and was rarely heard by mainstream white audiences. In 1951, Cleveland, Ohio disc jockey Alan Freed would begin playing this type of music for his white audience, and it is Freed who is credited with coining the phrase "rock and roll" to describe the rollicking R&B music that he brought to the airwaves. There is much debate as to what should be considered the first rock and roll record. Candidates include the 1951 "Rocket 88" by Jackie Brenston & His Delta Cats, or later and more widely-known hits like Chuck Berry's "Maybellene" "Johnny B. Goode" or Bo Diddley's "Bo Diddley" or Bill Haley & His Comets' "Rock Around the Clock" or, as RollingStone magazine pointed out, to some controversy, in 2005, "That's all right", Elvis Presley's first single for SUN records, in Memphis. Some historians go further back, pointing to musicians like Fats Domino, who were recording in the 40s in styles largely indistinguishable from rock and roll; these include Louis Jordan's "Is You Is or Is You Ain't My Baby?", Jack Guthrie's "The Oakie Bookie" (1947) and Benny Carter and Paul Vandervoort II's "Rock Me to Sleep" (1950). Main artists starting to score in the main hit charts from 1955 onward included the influencial and pioneering: Bill Haley, Elvis Presley, Fats Domino, Little Richard, Chuck Berry, Jerry Lee Lewis.

Early North American rock and roll (1953-1963)

Whatever the beginning, it is clear that rock appeared at a time when racial tensions in the United States were coming to the surface. African Americans were protesting segregation of schools and public facilities. The "separate but equal" doctrine was nominally overturned by the Supreme Court in 1954. It can hardly be a coincidence, then, that a musical form combining elements of white and black music should arise, and that this music should provoke strong reactions, of all types, in all Americans. 1954The phrase may possibly first be heard on Louis Jordan and His Tympany Five's version of Tamburitza Boogie recorded on August 18, 1950, in New York City. However, in 1922, Trixie Smith had a song titled "My Man Rocks Me with One Steady Roll". On March 21, 1952 in Cleveland, Alan Freed (also known as Moondog) organized the first rock and roll concert, titled "The Moondog Coronation Ball". The audience and the performers were mixed in race and the evening ended after one song in a near-riot as thousands of fans tried to get into the sold-out venue. The culture industry soon understood that there was a white market for black music that was beyond the stylistic boundaries of rhythm and blues and so social prejudice and racial barriers, could do nothing against the forces of capitalism. Rock and roll was an overnight success in the U.S. making ripples across the atlantic, culminating in 1964 with the British Invasion. By the end of the decade, rock had spread throughout the world. In Australia, for example, Johnny O'Keefe became perhaps the first modern rock star of that country, and beginning a long history of Australian rock.

Rockabilly

Main article: Rockabilly In 1954, Elvis Presley recorded at Sam Phillips' Sun studios in Memphis, the regional hit "That's All Right, Mama." Elvis played a rock and country & western fusion called rockabilly, which was characterized by hiccupping vocals, slapping bass and a spastic guitar style. He became the first superstar rock musician. It was the following year's "Rock Around the Clock" by Bill Haley & His Comets that really set the rock boom in motion, though. The song was one of the biggest hits in history, and frenzied teens flocked to see Haley and the Comets perform it, even causing riots in some places; "Rock Around the Clock" was a breakthrough for both the group and for all of rock and roll music. If everything that came before laid the groundwork, "Clock" certainly set the mold for everything else that came after. With its combined rockabilly and R & B influences, "Clock" topped the U.S. charts for several weeks, and became wildly popular in places like Australia and Germany. The single, released by independent label Festival Records in Australia, was the biggest-selling recording in the country at the time. In 1957, Jerry Lee Lewis and Buddy Holly became the first rock musicians to tour Australia, marking the expansion of the genre into a worldwide phenomenon. That same year, Bill Haley & His Comets toured Europe bringing rock 'n' roll to that continent for the first time.

Covers

Main article: Cover version Through the late 1940s and early 1950s, R&B music had been gaining a stronger beat and a wilder style, with artists such as Fats Domino and Johnny Otis speeding up the tempos and increasing the backbeat to great popularity on the juke-joint circuit. Despite the efforts of Freed and others, black music was still taboo on many white-owned radio outlets. However, savvy artists and producers quickly recognized the potential of rock and raced to cash in with white versions of this black music. Covering was customary in the music industry at the time. One of the first successful rock and roll covers was Wynonie Harris's transformation of Roy Brown's "Good Rocking Tonight" from a jump blues to a showy rocker. The most notable trend, however, was white pop covers of black R&B numbers. Black performers saw their songs recorded by white performers, an important step in the dissemination of the music, but often at the cost of feeling and authenticity. Most famously, Pat Boone recorded sanitized versions of Little Richard songs, though Boone found "Long Tall Sally" so intense that he couldn't cover it. Later, as those songs became popular, the original artists' recordings received radio play as well. Little Richard once called Pat Boone from the audience and introduced him as "the man who made me a millionaire". The cover versions were not necessarily straightforward imitations. For example, Bill Haley's incompletely bowdlerized cover of "Shake, Rattle and Roll" transformed Big Joe Turner's humorous and racy tale of adult love into an energetic teen dance number, while Georgia Gibbs replaced Etta James's tough, sarcastic vocal in "Roll With Me, Henry" (covered as "Dance With Me, Henry") with a perkier vocal more appropriate for an audience unfamiliar with the song to which James's song was an answer, (Hank Ballard's "Work With Me, Annie").

British Rock and Roll

Main article: British rock The Trad jazz movement brought blues artists to Britain, and in 1955 Lonnie Donegan's version of "Rock Island Line" began Skiffle music which inspired many young people to have a go, including John Lennon whose "The Quarry Men" formed in March 1957 would gradually change and develop into The Beatles. This primed the United Kingdom to respond creatively to American rock and roll which had an impact across the globe. In Britain skiffle groups, record collecting and trend-watching were in full bloom among the youth culture prior to the rock era, and color barriers were less of an issue with the idea of separate "race records" seeming almost unimaginable. Countless British youths listened to R&B and rock pioneers and began forming their own bands. Britain quickly became a new centre of rock and roll. In 1958 three British teenagers formed a rock and roll group, Cliff Richard and the Drifters (later renamed Cliff Richard and the Shadows). The group recorded a hit, "Move It", marking not only what is held to be the very first true British rock 'n' roll single, but also the beginning of a different sound — British rock. Richard and his band introduced many important changes, such as using a "lead guitarist" (virtuoso Hank Marvin) and an electric bass. The British scene developed, with others including Tommy Steele and Adam Faith vying to emulate the stars from the U.S.. Some touring acts attracted particular popularity in Britain, an example being Gene Vincent. This inspired many British teens to begin buying records and follow the music scene, thus laying the groundwork for Beatlemania. At the start of the '60s instrumental dance music was very popular, with hits including Apache by the The Shadows and Telstar by The Tornados from a British branch of Surf instrumental music.

Decline and rebirth

Main article: Rock (music). At the end of the 1950s the original Rock 'n' Roll rush faded, as stars like Elvis Presley diverted into the more commercial sound of ballads, and the music went out of fashion. It had influenced other genres which were going strong, and in the United Kingdom it formed a major part of the mix that brought the surge of British rock that reinvigorated Rock music worldwide.

Books


- The Fifties by Pulitzer Prize winning author David Halberstam (1996) Random House (ISBN 0517156075) provides information and analysis on fifites popular culture exploring major social and cultural changes including television, transistor radios, the phenomenon of Elvis Presley and the rise of rock-and-roll.
- The Rolling Stone Illustrated History of Rock and Roll : The Definitive History of the Most Important Artists and Their Music by editors James Henke, Holly George-Warren, Anthony Decurtis, Jim Miller. (1992) Random House (ISBN 0679737286)
- The Rolling Stone Encyclopedia of Rock & Roll by Holly George-Warren, Patricia Romanowski, Jon Pareles (2001) Fireside Press (ISBN 0743201205)

See also


- 100 Greatest Women of Rock and Roll
- List of rock genres
- Cultural appropriation

External links


- [http://www.history-of-rock.com The History of Rock'n'Roll 1954 - 1963]
- [http://www.bandnews.org/genre/Rock/ Rock and Roll News]
- [http://www.rockhallsf.com San Francisco Rock and Roll Hall of Fame]
- [http://www.myclassiclyrics.com/elvis_presley/elvis_presley_sound_video_3.html Analysis on the True Birth of Rock and Roll] When did rock really begin
- [http://www.jerryfielden.com/essays/electromusic.htm The influence of Electronic Music in Rock Music, 1967-76; Keith Emerson, Jimi Hendrix, Pink Floyd and others]
- [http://nomuzak.co.uk/against_pop.html Pop and Rock] An analysis of musical form and technique in popular music.
- [http://www.reasontorock.com/ Reason to Rock - Rock Music as Art Form]
- [http://www.myclassiclyrics.com/ Classic Rock Lyrics Page]
- [http://www.rockforums.net/ Rock Forums]
- [http://www.everythingrock.com/ Everythingrock.com - Rock music source & community]
- [http://groups-beta.google.com/group/Rock-Talk/ Rock music forum]
- [http://www.rantandroll.com/ Rock and Roll Forum]
- [http://www.rockreviews.co.uk/ Rock Reviews] ja:%E3%83%AD%E3%83%83%E3%82%AF%E3%83%B3%E3%83%AD%E3%83%BC%E3%83%AB ko:%EB%9D%BD simple:Rock music Category:American styles of music Category:Radio formats Category:Rock music Category:Musical movements Category:Musical genres Category:Youth culture in the United Kingdom Category:Moral panics

Radio station

A radio station is a sound broadcasting service. Traditionally, radio stations have broadcast through the air via radio waves (a form of electromagnetic radiation), sent through a transmitter and antenna. Today, many if not most stations broadcast via cable FM, local wire networks, satellite, or the Internet as well as (or instead of) atmospheric broadcasting. Stations can be linked in radio networks to broadcast a common program, either in syndication or simulcast, or both. Broadcasting program material in real time is known as live broadcasting. As technology for sound recording improved, an increasing proportion of broadcast programming used pre-recorded material. A current trend is the automation of radio stations. Some stations now operate without direct human intervention by using entirely pre-recorded material sequenced by computer control (see Voice-tracking). Radio stations are of several types. The best known are the AM and FM stations, including both commercial and public or nonprofit varieties. Non-commercial college and university radio stations are found throughout the developed world. The earliest radio stations were simply radio telegraph systems, and did not carry audio. The first known audio transmission that could be called a broadcast occurred on Christmas Eve in 1906, and was made by Reginald Fessenden. While many early experimenters attempted to create systems similar to radiotelephone devices where only two parties were meant to communicate, there were others who intended to transmit to larger audiences. Charles Herrold started broadcasting in California in 1909 and was carrying audio by the next year. For the next decade, radio tinkerers had to build their own radio receivers. KDKA AM of Pittsburgh, Pennsylvania (owned by Westinghouse) started broadcasting as the first "commercial" radio station on November 2, 1920. The commercial sense of the station came from the type of license—they didn't start airing advertisements until a few years later. The first broadcast was the results of the U.S. presidential election, 1920. Many historians base KDKA's status as "first" on the fact that commercially-produced radio receivers weren't available until that time. However, by that standard, many believe that other stations should count, as at least one smaller manufacturer with their own station was making radios by the time KDKA was licensed. AM stations were developed first. AM refers to amplitude modulation, a mode of broadcasting radio waves, and occurs on North American airwaves in the mediumwave frequency range of 530 to 1700 kHz (known as the "standard broadcast band"). The band was expanded in the 1990s by adding nine channels from 1620 to 1700 kHz. Channels are spaced every 10 kHz in the Americas, and generally every 9 kHz everywhere else. Europe also uses the longwave band. FM refers to frequency modulation, and occurs on VHF airwaves everywhere (except Japan) in the frequency range of 88 to 108 MHz. Japan uses the 74 to 90 MHz band. FM stations are much more popular in economically developed regions, such as Europe and the United States, especially since higher sound fidelity and stereo broadcasting became common in this format. The digital radio stations are now emerging, first in Europe (the U.K. and Germany), and later in the United States. The European system is named DAB, for Digital Audio Broadcasting, and uses the public domain EUREKA 147 system. In the United States, the IBOC system is named HD Radio and owned by a private company, a consortium called iBiquity. It is expected that for the next 10 to 20 years, all these systems will co-exist, while by 2015 to 2020 digital radio may predominate, at least in the developed countries. Many other non-broadcast types of radio stations exist. These include:
- base stations for police, fire and ambulance networks
- military base stations
- dispatch base stations for taxis, trucks, and couriers
- emergency broadcast systems
- amateur radio stations

See also


- History of broadcasting
- History of radio
- Television station
- List of radio stations
- International broadcasting
- Callsign (radio)
- Low power radio station
- Radio format

External links


- [http://search.fcc.gov/query.html?qt=radio+station&col=fccall+edocs+digest&ht=0&qp=&qs=&qc=&pw=100%25&ws=0&la=en&qm=0&st=1&nh=10&lk=1&rf=0&oq=&rq=0&si=0&Submit+search+request.x=8&Submit+search+request.y=9 In the United States, See FCC]
- category:broadcast engineering ja:ラジオ放送局

Los Angeles, California

The City of Los Angeles (from Spanish; Los Ángeles, ) also known simply as L.A., is the second-largest city in the United States in terms of population, as well as one of the world's most important economic, cultural, and entertainment centers. It was incorporated as a city in California on April 4, 1850, when the city's population was only 1,610, and is the county seat of Los Angeles County. As of the 2000 census, it has a population of 3,694,820, but a May 1, 2005 California Department of Finance estimate shows the city's population at 3,957,875, with the metropolitan area at 17,545,623. The city is also large by geographic standards since it sprawls over more than 465 square miles (1200 square kilometers), making it physically larger than New York City and Chicago. In addition, Los Angeles hosted two Olympic Games (in 1932 and 1984) and is home to world-renowned scientific and cultural institutions. The city is one of the biggest entry points for immigrants to the United States, making it one of the most culturally diverse places in the world. People are attracted to the city for its warm weather, its vibrant lifestyle, its unique energy, and the opportunity to realize the "American Dream."

History

The Los Angeles coastal area was occupied by the Tongva, Chumash, and even earlier Native American peoples for thousands of years. The Spanish arrived in 1542, when Juan Cabrillo visited the area. In 1769, the Spanish returned to California to stay. Father Juan Crespi described a "beautiful river", which the explorers named in Spanish "El Pueblo de Nuestra Señora la Reina de los Ángeles del Río de Porciúncula", English: "The Village of Our Lady the Queen of the Angels of the Porciuncula River". The Mission San Gabriel Arcángel was founded in 1771, thus establishing a permanent presence in the area and securing Spanish territory. territory On September 4, 1781, settlers from the San Gabriel Mission founded the town and named it after the river, but used a slighly shorter version. The official name was El Pueblo de la Reina de los Ángeles, "The Town of the Queen of the Angels", showing Franciscan affiliation. It remained a small mission and ranch town for decades. Mexican independence from Spain was achieved in the 1820s, but the greatest change took place in present-day Montebello after the Battle of Rio San Gabriel in 1847, which decided the fate of Los Angeles. Yankees gained control after they flooded into California during the Gold Rush and secured the subsequent admission of California into the United States. Los Angeles was incorporated as a city in 1850. Railroads arrived when the Southern Pacific completed its line to Los Angeles in 1876. Oil was discovered in 1892, and by 1923, Los Angeles was supplying one-quarter of the world's petroleum. Even more important to the city's growth was water. In 1913, William Mulholland completed the aqueduct that assured the city's growth and led to the annexation by the City of Los Angeles, starting in 1915, of dozens of neighboring communities without water supplies of their own. A somewhat fictionalized account of the Owens Valley Water War can be found in the motion picture Chinatown. In the 1920s the motion picture and aviation industries both flocked to Los Angeles and helped to further develop it. The city was the proud host of the 1932 Summer Olympics. World War II brought new growth and prosperity to the city, although many of its Japanese-American residents were transported to internment camps for the duration of the war. This period also saw the arrival of the German exiles, which included such notables as Thomas Mann, Bertolt Brecht and Lion Feuchtwanger. The postwar years saw an even greater boom as urban sprawl expanded into the San Fernando Valley. The Watts riots in 1965 reminded the country of the deep racial divisions that even the nation's youngest city faced. The XXIII Olympiad was successfully hosted in Los Angeles in 1984. The city was once again tested by the 1992 Los Angeles riots and the 1994 Northridge earthquake. A city-wide vote on San Fernando Valley and Hollywood secession was defeated in 2002.

Geography and climate

Geography

2002 According to the United States Census Bureau,the city has a total area of 1,290.6 km² (498.3 mi²). 1,214.9 km² (469.1 mi²) of it is land and 75.7 km² (29.2 mi²) of it is water. The total area is 5.86% water. The extreme north-south distance is 44 miles (71 km), the extreme east-west distance is 29 miles (47 km), and the length of the city boundary is 342 miles (550 km). The land area is the 9th largest in the Lower-48th of United States (excluding Alaska and Hawaii). The highest point in Los Angeles is Sister Elsie Peak (5,080 feet) at the far reaches of the northeastern San Fernando Valley, part of Mt. Lukens. The Los Angeles River is a short, largely seasonal river flowing through the city, with headwaters in San Fernando Valley. Its length is almost entirely lined in concrete. The Los Angeles area is remarkably rich in native plant species. With its beaches, dunes, wetlands, hills, mountains, and rivers, the area contains a number of important biological communities. The largest area is coastal sage scrub, which covers the hillsides in combustible chaparral. Native plants include: California poppy, matilija poppy, toyon, coast live oak, giant wild rye grass, and hundreds of others. Unfortunately, many native species are so rare as to be endangered, such as the Los Angeles sunflower. There are many exotic flowers and flowering trees that are blooming year-round, with subtle colors, including the jacaranda, hibiscus, phlox, bougainvillea, coral tree blossoms and bird of paradise. If there were no city here, flower-growing could still flourish as an industry, as it does in Lompoc. Wisteria has been known to grow to house-lot size, and in Descanso Gardens there are forests of camellia trees. Orchids require special attention in this Mediterranean climate.

Cityscape

Mediterranean climate Mediterranean climate The city is divided into many neighborhoods. Most of the neighborhood names come from farm towns that were annexed by the growing city, physical terrain features, major streets, or subdivision names coined by enterprising developers. These divisions have no legal status but are of significance to residents for cultural and financial reasons. Signs have been placed on major thoroughfares designating some of the communities, a practice going back decades. (The "neighborhood councils" of Los Angeles began in 1999 and often follow different borders).

Climate

Mediterranean climate The city is situated in a Mediterranean climate or subtropical zone, experiencing mild, wet winters and warm to hot, dry summers. Onshore breezes keep the beach communities of Los Angeles and San Diego cooler in summer and warmer in winter than those further inland. Temperatures in the summer can get well over 90 °F (32 °C) and smog can become a problem. Average Summer day time highs are 85 °F (29 °C), with overnight lows of 66 °F (18 °C). Winter day time high temperatures get up to around 67 °F (19 °C, with overnight lows of 48 °F (8 °C) and rain is a possibility. Generally the weather is warm and dry in all seasons, with 325 days of sunshine a year. The median temperature in January is 58.3 °F (14.6 °C) and 74.3 °F (23.5 °C) in July. The highest temperature recorded within city borders was 116.0 °F (46.7 °C) at Canoga Park in 1985; the lowest temperature recorded was 18.0°F (−7.8 °C) in 1989, also at Canoga Park. The highest temperature ever recorded for Downtown Los Angeles was 112.0 °F (44.4 °C) on June 26 1990, and the lowest temperature ever recorded was 28.0 °F (−2.2 °C) on January 4 1949. Accumulating snowfall is a once in a lifetime event. There has been three recorded instances of snowfall in the city; two inches (5 cm) of snow fell in 1932 and the last snowfall occurred in 1949. Rain occurs mainly in the winter and spring months (February being the wettest month) with great variations in storm severity year by year. Los Angeles averages 13-16 inches (330 to 410 mm) of rain per year.

Pollution

1949Due to the city's geography as well as the population's heavy reliance on automobiles as a major form of transportation, the city suffers from severe air pollution in the form of smog. The Los Angeles Basin and the San Fernando Valley hold in the fumes from automobiles, diesel trucks, shipping, and locomotive engines, as well as manufacturing and other sources. In addition, the groundwater is increasingly threatened by MTBE from gas stations and perchlorate from rocket fuel. Some consider urban sprawl to be a result of the city's transportation system. Light pollution is also a problem.

Seismic activity

Like most areas of California, Los Angeles is subject to frequent earthquakes, due to the close proximity of the San Andreas Fault, as well as the smaller San Jacinto Fault and Banning Fault, in southern California. Most earthquakes are relatively minor, however, throughout history there are several major earthquakes. The most recent was the 1994 Northridge earthquake, which was centered in the northern San Fernando Valley. Coming less than two years after the L.A. riots, the Northridge earthquake was a severe emotional shock to Southern Californians, in addition to causing physical damage worth billions of dollars. Other major earthquakes include the 1987 Whittier Narrows earthquake and the 1971 Sylmar earthquake.

People and culture

Demographics

Sylmar earthquake

Census 2000

As of the census of 2000, there were 3,694,820 people, 1,275,412 households, and 798,407 families residing in the city. The population density was 3,041.3/km² (7,876.8/mi²). There were 1,337,706 housing units at an average density of 1,101.1/km² (2,851.8/mi²). The racial makeup of the city was 46.93% White, 11.24% African American, 0.80% Native American, 15.89% Asian, 0.16% Pacific Islander, 25.70% from other races, and 5.18% from two or more races. 46.53% of the population were Hispanic or Latino of any race and 29.75% White, not of Latino/Hispanic origins. There were 1,275,412 households of which 33.5% had children under 18, 41.9% were married couples, 14.5% had a female householder with no husband present, and 37.4% were non-families. 28.5% of households were made up of individuals and 7.4% had someone living alone who was 65 years of age or older. The average household size was 2.83 and the average family size 3.56. The age distribution was: 26.6% under 18, 11.1% from 18 to 24, 34.1% from 25 to 44, 18.6% from 45 to 64, and 9.7% who were 65 or older. The median age was 32. For every 100 females there were 99.4 males. For every 100 females age 18 and over, there were 97.5 males. The median income for a household was $36,687, and for a family was $39,942. Males had a median income of $31,880, females $30,197. The per capita income was $20,671. 22.1% of the population and 18.3% of families were below the poverty line. 30.3% of those under the age of 18 and 12.6% of those aged 65 or older were below the poverty line.

Other demographics

Of 2,182,114 native people, 1,485,576 were born in California, 663,746 were born in a different state of the United States of America, and 31,792 were born in a United States territory (Puerto Rico, Guam, U.S. Virgin Islands, or Northern Marianas). Of 1,512,720 foreign born people, 100,252 were born in Europe, 376,767 were born in Asia, 20,730 were born in Africa, 4,104 were born in Oceania, 996,996 were born in Latin America, and 13,859 were born in Northern America. Of such foreign-born people, 569,771 entered between 1990 to March 2000. 509,841 are naturalized citizens and 1,002,879 are not citizens. The people of Los Angeles are known as Angelenos. L.A. can truly be described as a "world city" (Alpha World City) — that is, it has one of the largest and most diverse populations of any municipality anywhere. The Hispanic and Asian American populations are growing particularly quickly — the Asian American population is the second largest of any city in the U.S. Los Angeles hosts the largest populations of Armenians, Cambodians, Filipino, Guatemalans, Israelis, Koreans, Salvadorans, Thais, Mexicans, and Hungarians outside of their respective countries. Los Angeles is also home to the largest populations of Japanese and Persians (Iranians) living in the U.S., and has one of the largest Native American populations in the country. L.A. is home to people from more than 140 countries, who speak at least 224 different languages. Ethnic enclaves like Chinatown, Koreatown, Little India (Artesia), Little Armenia, Thai Town, Historic Filipinotown and Little Ethiopia give testimony to the polyglot character of Los Angeles.

Crime

The COMPSTAT unit of the Los Angeles Police Department tabulates Part I offenses (violent and property crimes) committed in the city. Los Angeles has been experiencing significant decline in Part I offenses since the mid 1990s hitting a record low in 2004. Criminality peaked in 1992 with 72,667 recorded acts of violence (1,096 homicides) and 245,129 recorded property crimes. In 2004, there were 31,245 recorded violent crimes of which 518 were homicides. The distribution of homicides in the city is uneven with nearly half of such crimes occurring in the four stations of the South Bureau of the LAPD encompassing South Los Angeles and the Harbor area. A further quarter occur in the areas covered by the Central Bureau which covers Downtown and its environs. Property crimes were three times more common than violent crimes; 90,374 were recorded in 2004. When compared to other large cities, Los Angeles fares relatively well with a total crime index lower than San Francisco, Chicago, and Boston. Many movies and songs about Los Angeles depict the notion that the city is home to a large number of gangsters and professional criminals. According to a May 2001 Drug Threat Assessment by the National Drug Intelligence Center [http://www.usdoj.gov/ndic/pubs0/668/overview.htm], Los Angeles County is home to 152,000 gang members organized into 1,350 gangs. In Los Angeles, car chases happen more often than in most other major cities (sometimes several per week). The city's complex freeway system allows for lengthier pursuits, which may take them throughout the city. Other common crimes include: car-to-car shootings (see road rage), drive-by shootings, thrill killings, hit-and-run accidents, and carjackings. Numerous instances of all these crimes are documented on the LAPD press release Web site [http://www.lapdonline.org/portal/generic.php?page=/press_releases/press_releases.php]. One interesting example is a report on ten freeway shootings within two months [http://www.nbc4.tv/news/4449599/detail.html]. Also, Los Angeles has been a popular setting for several crime-based video games, such as Grand Theft Auto: San Andreas (which features Los Santos, a city largely based on the Los Angeles metropolitan area) and True Crime: Streets of LA (which takes place in a close replica of the Los Angeles area).

Arts and entertainment

True Crime: Streets of LA Los Angeles is sometimes considered the entertainment capital of the world. It shares the title of the cultural capital of the United States with New York City. Its largest entertainment industry is film production, but it is an important center for music, art, and architecture as well. As a major global metropolis, Los Angeles has evolved a unique culture and that is well-portrayed in popular media and is sometimes idealized as highly desirable. However, this culture has also inspired criticism that it is not really a unique culture, although most believe the contrary. Residents of the city of Los Angeles are served by the Los Angeles Public Library (LAPL) and its branch locations. Residents of the unincorporated areas of Los Angeles County and various cities within the county are served by the County of Los Angeles Public Library The LAPL is funded by voter-approved bond and tax levy packages. The Main Library is located in downtown Los Angeles and has been recognized as a National Historic Site.

Media

The major daily newspaper in the area is The Los Angeles Times. La Opinión is the city's major Spanish-language paper. There are also a wide variety of smaller regional newspapers, alternative weeklies and magazines, including the Los Angeles Newspaper Group's Daily News (which focuses coverage on the Valley), Village Voice Media's L.A. Weekly, L.A. City Beat, Los Angeles magazine, Los Angeles Business Journal, Los Angeles Daily Journal (legal industry paper), Variety (entertainment industry paper), and [http://www.downtownnews.com Los Angeles Downtown News]. In addition to the English and Spanish language papers, numerous local periodicals serve immigrant communities in their native languages (e.g. Korean, Persian and Japanese). Most of the above papers are center-left or left in their political stance with the clear exception of the Daily News, which is center-right. One example of this is that the L.A. Times often does high-quality investigative journalism on important inner-city issues like health care and crime, while the L.A. Daily News is usually content to run wire stories on those issues, if it covers them at all. The L.A. Daily News also focuses on business issues, education, and crime. It strongly supports lowering taxes. Many cities adjacent to Los Angeles also have their own daily newspapers whose coverage and availability overlaps into certain Los Angeles neighborhoods. Examples include the Daily Breeze (serving the South Bay), and The Long Beach Press-Telegram. The Los Angeles metro area is served by a wide variety of local television stations, and is the second largest designated market area (DMA) in the U.S. with 5,431,140 homes (4.956% of the U.S.). The major network television affiliates include KCBS 2 (CBS), KABC-TV 7 (ABC), KNBC 4 (NBC), KTTV 11 (FOX), KTLA 5 (WB), and KCOP 13 (UPN), and KPXN 30 (i). There are also four PBS stations in the area, including KVCR 24, KCET 28, KOCE 50, and KLCS 58. World TV operates on two channels, KNET 25 and KSFV-LP 27. There are also several Spanish-language television networks, including KMEX 34 (Univision), KFTR 46 (Telefutura), KVEA 52 (Telemundo), and KAZA 54 (Azteca America). KTBN 40 (Trinity Broadcasting Network), is a religious station in the area. Several independent television stations also operate in the area, including KCAL 9 (owned by CBS/Viacom), KSCI 18 (focuses primarily on Asian language programming), KWHY 22 (Spanish-language), KNLA-LP 27 (Spanish-language), KJLA 33 (variety), KPAL-LP 38, KXLA 44, KDOC 56 (classic programming and local sports), KJLA 57 (variety), and KRCA 62 (Asian language programming).

Religion

Los Angeles is home to adherents of many religions. Los Angeles has the second-largest Jewish community in the United States, rivaled only by New York City. The Roman Catholic Archbishop of Los Angeles leads the largest archdiocese in the country. Roger Cardinal Mahony oversaw construction of the Cathedral of Our Lady of the Angels, completed in 2002 at the north end of downtown. The Los Angeles Temple of the Church of Jesus Christ of Latter-day Saints is their second-largest temple and is located in West Los Angeles. The Azusa Street Revival (1906–1909) in Los Angeles was a key milestone in the history of the Pentecostal movement. Los Angeles can be called the birthplace of Christian Fundamentalism. From 1908 to 1959 the Bible Institute of Los Angeles (B.I.O.L.A. now Biola University) was located in downtown at the corner of Hope and Sixth streets, in front and to the west of the Los Angeles Central Library building. In 1913, B.I.O.L.A. published a set of books called The Fundamentals, which presented a defense of the traditional conservative interpretation of the Holy Bible. The term fundamentalism is derived from these books. In the 1920s, Aimee Semple McPherson established a thriving evangelical ministry, with her Angelus Temple in Echo Park open to both black and white church members. Billy Graham became a celebrity during a successful revival campaign in Los Angeles in 1949. Herbert W. Armstrong's Worldwide Church of God used to have its headquarters in nearby Pasadena, now in Glendale. Until his death in 2005, Dr. Gene Scott was based near downtown. The Metropolitan Community Church, a fellowship of Christian congregations a focus on outreach to gays and lesbians, was started in Los Angeles in 1968 by Troy Perry. Jack Chick, of "Chick Tracts", was born in Boyle Heights and lived in the area most of his life. Chick Tracts]] Because of Los Angeles's large multi-ethnic population there are numerous organizations in the area representing a wide variety of faiths, including Islam, Buddhism, Hinduism, Sikhism, Bahá'í, various Eastern Orthodox Churchs, Sufism and others. Immigrants from Asia for example, have formed a number of significant Buddhist congregations. Los Angeles has been a destination for Swamis and Gurus since as early as 1900, including Paramahansa Yogananda (1920). The Self-Realization Fellowship is headquartered in Hollywood and has a private park in Pacific Palisades. Los Angeles is the home to a number of Neopagans, as well as adherents of various other mystical religions. One wing of the Theosophist movement is centered in Los Angeles, and another is in neighboring Pasadena. Maharishi Mahesh Yogi founded the Transcendental Meditation movement in Los Angeles in the late 1950s. The Church of Scientology has a major presence in Hollywood, as does the Kabbalah Centre.

Sports

Club Sport League Venue Logo
Baseball Major League Baseball: National League Dodger Stadium Dodger Stadium
Baseball Major League Baseball: American League Angel Stadium of Anaheim Angel Stadium of Anaheim
Los Angeles Lakers Basketball National Basketball Association: Western Conference Staples Center Staples Center
Los Angeles Clippers Basketball National Basketball Association: Western Conference Staples Center Staples Center
Los Angeles Sparks Basketball Women's National Basketball Association: Western Conference Staples Center Staples Center
Los Angeles Kings Ice Hockey National Hockey League: Western Conference Staples Center Staples Center
Mighty Ducks of Anaheim Ice Hockey National Hockey League: Western Conference Arrowhead Pond Arrowhead Pond
C.D. Chivas USA Soccer Major League Soccer: Western Confernce Home Depot Center Home Depot Center
Los Angeles Galaxy Soccer Major League Soccer: Western Conference Home Depot Center Home Depot Center
Los Angeles Avengers Arena Football Arena Football League: American Conference Staples Center Staples Center
---- Los Angeles is the home of the Los Angeles Dodgers, the Los Angeles Lakers and Los Angeles Clippers , the Los Angeles Sparks, the Los Angeles Kings, the Club Deportivo Chivas USA and Los Angeles Galaxy, and the Los Angeles Avengers. Los Angeles has been without an NFL franchise since 1995 despite being the second-biggest television market in North America. Prior to 1995, the Rams (1946-1994) and the Raiders (1982-1994) of the NFL were in the Los Angeles market. Raiders Anaheim, about 25 miles (40 km) to the south-east of downtown, is home to the Mighty Ducks of Anaheim and the Los Angeles Angels of Anaheim. At various times in history the Angels have been known as the Los Angeles Angels (1961-1965), the California Angels (1965-1997), and the Anaheim Angels (1997-2004); talks in 2004 suggested the team was considering returning to the original name, over loud protests from the Anaheim government. The name was officially changed to the Los Angeles Angels of Anaheim in late December 2004 in order to link with the larger city while still complying with contractual obligations. Beach volleyball and windsurfing were both invented in the area (though predecessors of both were invented in some form by Duke Kahanamoku in Hawaii). Venice, also known as Dogtown, is credited with being the birthplace of skateboarding and the place where Rollerblading first became popular. Area beaches are popular with surfers, who have created their own subculture. Los Angeles has twice played host to the summer Olympic Games: in 1932 and in 1984. The Los Angeles area contains all kinds of topography, notably the hills and mountains rising around the metropolis (it's the only major city in the United States bisected by a mountain range); four mountain ranges extend into city boundaries. Thousands of miles of trails crisscross the city and neighboring areas, providing exercise and wilderness access on foot, bike, or horse. Across the county a great variety of outdoor activities are available, such as skiing, rock climbing, gold panning, hang gliding, and windsurfing. Numerous outdoor clubs serve these sports, including the Angeles Chapter of the Sierra Club, which leads over 4,000 outings annually in the area.

Economy

The economy of Los Angeles is driven by agriculture, petroleum, entertainment (motion pictures, television, and recorded music), aerospace, international trade, and tourism. Los Angeles is also the largest manufacturing center in the United States. The contiguous ports of Los Angeles and Long Beach together compose the most significant port in North America and one of the most important ports in the world. They are vital to trade within the Pacific Rim. Los Angeles is the world center for the entertainment industry, including adult entertainment. Other significant industries include media production, finance, aerospace, telecommunications, law, tourism, health and medicine, and transportation. The city is home to three major Fortune 500 companies, including aerospace contractor Northrop Grumman, energy company Occidental Petroleum Corporation, and homebuilding company KB Home. Other companies headquartered in Los Angeles include Twentieth Century Fox, Herbalife, Univision, Metro Interactive, LLC, Premier America, CB Richard Ellis, Gibson, Dunn & Crutcher LLP, Guess, Inc., O'Melveny & Myers LLP, Paul, Hastings, Janofsky & Walker LLP, TOKYOPOP, The Jim Henson Company, Paramount Pictures, Robinsons-May, Sunkist, Fox Sports Net, Health Net, Inc., 21st Century Insurance, and The Coffee Bean & Tea Leaf. The metropolitan area contains the headquarters of even more companies, many of whom wish to escape the city's high taxes. For example, Los Angeles charges a gross receipts tax based on a percentage of business revenue, while most neighboring cities charge only small flat fees. The companies below clearly benefit from their proximity to Los Angeles, while at the same time they also avoid the city's taxes (and other problems). Some of the major companies headquartered in cities adjacent to Los Angeles include Shakey's Pizza (Alhambra), Academy of Motion Pictures Arts and Sciences (Beverly Hills), City National Bank (Beverly Hills), Hilton Hotels (Beverly Hills), DiC Entertainment (Burbank), The Walt Disney Company (Fortune 500 - Burbank), Warner Brothers (Burbank), Countrywide Financial Corporation (Fortune 500 - Calabasas), THQ (Calabasas), Belkin (Compton), National Public Radio West (Culver City), Sony Pictures Entertainment (parent of Columbia Pictures, located in Culver City), Computer Sciences Corporation (Fortune 500 - El Segundo), DirecTV (El Segundo), Mattel (Fortune 500 - El Segundo), Unocal (Fortune 500 - El Segundo), DreamWorks SKG (Glendale), Sea Launch (Long Beach), ICANN (Marina Del Rey), Cunard Line (Santa Clarita), Princess Cruises (Santa Clarita), Activision (Santa Monica), and RAND (Santa Monica). There are many other well-known companies with headquarters located in the County of Los Angeles or the greater Los Angeles area, but they are far beyond the City of Los Angeles (and the scope of this article). See Los Angeles County: Economy for a list of such companies in Los Angeles County.

Infrastructure

Government

Los Angeles County: Economy The city is governed by a mayor-council system. The current mayor is Antonio Villaraigosa. There are 15 city council districts. Other elected city officials include the city attorney, Rocky Delgadillo, and the city controller, Laura Chick. The city attorney prosecutes misdemeanors within the city limits. The district attorney, elected by the county voters, prosecutes misdemeanors in unincorporated areas and in 78 of the 88 cities in the county, as well as felonies throughout the county. The Los Angeles Police Department (LAPD) polices the city of Los Angeles. The Los Angeles County Sheriff's Department polices all unincorporated areas of Los Angeles County and some cities which have contracted for law enforcement services because they lack police departments of their own, including Calabasas, Temple City, West Hollywood, and Compton. The Los Angeles Police Department, Los Angeles Public Library System and Los Angeles Unified School District are among the largest such organizations in the country. The Los Angeles Department of Water and Power provides service to city residents and businesses. The city government has been perceived as inefficient and ineffective by residents of some areas, which led to an unsuccessful secession movement by the San Fernando Valley and Hollywood in 2002. The main problem seems to be that the city administration in Downtown gives priority to high-density neighborhoods like Mid-City and Downtown at the expense of its far-flung suburban neighborhoods. To make the government more responsive and to help encourage the cohesiveness of neighborhood communities, the city council has promoted the formation of neighborhood councils. These advisory councils were first proposed by city council member Joel Wachs in 1996 and were incorporated in the Charter Reform of 1999. The councils cover districts which are not necessarily identical to the traditional neighborhoods of Los Angeles, the borders of which often reflect those of cities that were annexed to Los Angeles. More than 90 neighborhood councils have been formed and all stakeholders in a district may vote for council members. Though the councils have little actual power, they are still official government bodies and so must abide by California's Brown Act that strictly governs the meetings of deliberative assemblies. These and other regulatory requirements have proven frustrating for activists unaccustomed to bureaucratic procedures. The first notable achievement of the neighborhood councils was their organized opposition in March 2004 to an 18% increase in water rates by the Los Angeles Department of Water and Power (a municipal monopoly), which led the city council to suspend the rate hike pending further study.

Legal system

Los Angeles Department of Water and PowerThe Los Angeles County Superior Court has jurisdiction over all cases arising under state law, while the U.S. District Court for the Central District of California hears all federal cases. Both are headquartered in a large cluster of government buildings in the city's Civic Center. Unlike the largest city in the United States, modulation which represents information as variations in the instantaneous frequency of a carrier wave. (Contrast this with amplitude modulation, in which the amplitude of the carrier is varied while its frequency remains constant.) In analog applications, the carrier frequency is varied in direct proportion to changes in the amplitude of an input signal. Digital data can be represented by shifting the carrier frequency among a set of discrete values, a technique known as frequency-shift keying. FM is commonly used at VHF radio frequencies for high-fidelity broadcasts of music and speech (see FM broadcasting). Normal (analog) TV sound is also broadcast using FM. A narrowband form is used for voice communications in commercial and amateur radio settings. The type of FM used in broadcast is generally called wide-FM, or W-FM. In two-way radio, narrowband narrow-fm (N-FM) is used to conserve bandwidth. In addition, it is used to send signals into space. FM is also used at intermediate frequencies by most analog VCR systems, including VHS, to record the luminance (black and white) portion of the video signal. FM is the only feasible method of recording to and retrieving from magnetic tape without extreme distortion, as video signals have a very large range of frequency components -- from a few hertz to several megahertz. FM is also used at audio frequencies to synthesize sound. This technique, known as FM synthesis, was popularized by early digital synthesizers and became a standard feature for several generations of personal computer sound cards.

Applications in radio

sound card Edwin Armstrong presented his paper: [https://michael.industrynumbers.com/fm.pdf "A Method of Reducing Disturbances in Radio Signaling by a System of Frequency Modulation"], which first described FM radio, before the New York section of the Institute of Radio Engineers on November 6, 1935. Frequency modulation requires a wider bandwidth than amplitude modulation by an equivalent modulating signal, but this also makes the signal more robust against interference. Frequency modulation is also more robust against simple signal amplitude fading phenomena. As a result, FM was chosen as the modulation standard for high frequency, high fidelity radio transmission: hence the term "FM radio" (although for many years the BBC insisted on calling it "VHF radio", which is quite logical, since commercial FM broadcasting uses a well-known part of the VHF band; in certain countries, expressions referencing the more familiar wavelength notion are still used in place of the somewhat mysterious modulation technique name). FM receivers inherently exhibit a phenomenon called capture, where the tuner is able to clearly receive the stronger of two stations being broadcast on the same frequency. Problematically, however, frequency drift or lack of selectivity may cause one station or signal to be suddenly overtaken by another on an adjacent channel. Frequency drift typically constituted a problem on very old or inexpensive receivers, while inadequate selectivity may plague any tuner. An FM signal can also be used to carry a stereo signal: see FM stereo. However, this is done by using multiplexing and demultiplexing before and after the FM process, and is not part of FM proper. The rest of this article ignores the stereo multiplexing and demultiplexing process used in "stereo FM", and concentrates on the FM modulation and demodulation process, which is identical in stereo and mono processes.

Theory

If the signal to be transmitted is :x_m(t)\, which is restricted in amplitude to be : \left| x_m(t) \right| \le 1 \, and the sinusoidal carrier is :x_c(t) = A \cos (2 \pi f_c t)\, where fc is the carrier's base frequency in hertz and A is an arbitrary amplitude, the carrier will be modulated by the signal as in :x_c(t) = A \cos \left( 2 \pi \int_^ f(\tau)\, d \tau \right) = A \cos \left( 2 \pi \int_^ \left[ f_c + f_\Delta x_m(\tau) \right] \, d \tau \right) :where, f(t) = f_c + f_\Delta x_m(t) In this equation, f(t) is the instantaneous frequency of the oscillator and fΔ is the frequency deviation, which represents the maximum shift away from fc in one direction, assuming xm(t) is limited to the range ±1. Although it may seem that this limits the frequencies in use to fc ± fΔ, this neglects the distinction between instantaneous frequency and spectral frequency. The frequency spectrum of an actual FM signal has components extending out to infinite frequency, although they become negligibly small beyond a point. For a simplified case, the harmonic distribution of a sine wave signal modulated by another sine wave signal can be represented with Bessel functions - this provides a basis for a mathematical understanding of frequency modulation in the frequency domain. A rule of thumb, Carson's rule states that nearly all the power of a frequency modulated signal lies within a bandwidth of :2(f_\Delta +f_m)\, where fΔ is the peak deviation of the instantaneous frequency f(t) from the center carrier frequency fc (assuming xm(t) is in the range ±1) and fm is the highest modulating frequency of xm(t). Note that frequency modulation can be regarded as a special case of phase modulation where the carrier phase modulation is the time integral of the FM modulating signal. Frequency-shift keying refers to the simple case of frequency modulation by a simple signal with only discrete states, such as in Morse code or radio-teletype applications. Manchester encoding may be regarded as a simple version of frequency shift keying, where the high and low frequencies are respectively double and the same as the bit rate, and the bit transitions are synchronous with carrier transitions. When used in supervisory signaling in telephony, the term frequency-change signaling has been used to describe frequency modulation. The phrase frequency-modulated, an adjective, should have a hyphen when used attributively.

Modulation Index

As with other modulation indices, in AM this quantity indicates by how much the modulated variable varies around its unmodulated level. For FM, it relates to the variations in the frequency of the carrier signal: :h = \frac = \frac \ With a tone-modulated FM wave, if the modulation frequency is held constant and the modulation index is increased, the (non-negligible) bandwidth of the FM signal increases, but the spacing between spectra stays the same. If the frequency deviation is held constant and the modulation index increased, the bandwidth stays roughly the same, but the spacing between spectra decreases.

See also


- Frequency modulation synthesis (FM as an audio synthesis method)
- Modulation index
- Modulation, for a list of other modulation techniques
- History of radio

External links


- http://www.rfcafe.com/references/electrical/frequency_modulation.htm
- http://www.fas.org/man/dod-101/navy/docs/es310/FM.htm Category:Radio modulation modes ko:주파수 변조 ja:周波数変調

Radio call sign

In broadcasting and radio communications, a call sign (also known as a callsign or call letters, or abbreviated as a call) is a unique designation for a transmitting station. A call sign can be formally assigned by a government agency, informally adopted by individuals or organizations, or even cryptographically encoded to disguise a station's identity.

International series

International call signs are formal, semi-permanent, and issued by a nation's telecommunications agency. They are used for amateur, broadcast, commercial, maritime and sometimes military radio use (including television in some countries). Each country has a set of alphabetic or numeric International Telecommunication Union-designated prefixes with which their call signs must begin. For example:
- The United States uses the prefixes: W, K, N, and AAA to ALZ (only W and K are used for broadcast stations).
- Canada uses the prefixes: CF-CK, CY-CZ, VA-VG, VO, VX-VY, XJ-XO
- Mexico uses XA-XI
- The United Kingdom uses the prefixes: G, M, and 2
- France uses the prefixes: F, TM
- Germany uses the prefixes: DA-DR
- Chad uses the prefix: TT
- Italy uses the prefix: I

Aviation

Call signs in aviation are derived from several different policies, depending on the type of flight operation being conducted, and depending on whether the caller is in an aircraft or at a ground facility. In most countries, unscheduled general aviation flights identify themselves using the call sign correseponding to the aircraft's registration number (also called N-number in the U.S., or tail-number). In this case, the call sign is spoken using the ICAO phonetic alphabet. Aircraft registration numbers internationally follow the pattern of a country prefix (N in the U.S.), followed by a unique identifier made up of letters and numbers. For example, an aircraft registred as N9876Q conducting a general aviation flight would be use the call sign november niner eight seven six quebec. Alternatively, pilots may use the aircraft type in lieu of the N in the registration number, i.e. Cessna niner eight seven six quebec. After making initial contact to a ground facility, air traffic controllers may choose to use an abbreviated call sign (omitting all but the last two or three digits) for an aircraft under his or her control, so long as it is unambiguous. In the United States, a registration number begins with the letter N, followed by up to five digits and/or letters in one of these schemes: one to five numbers (N12345), one to four numbers and one suffix letter (N1234Z), or one to three numbers and two suffix letters (N123AZ). The numeric part of the registration never starts with zero. To avoid confusion with the digits 1 (one) and 0 (zero), the alphabetic letters I (india) and O (oscar) are not used in registration numbers. Commercial operators, including airlines, air cargo and air taxi operators, will usually use an ICAO or FAA-registered call sign for their company, which is used together with the flight number. For example, British Airways flight 75 would use the call sign Speedbird seven-five, since Speedbird is the registered call sign for British Airways. Air taxi operators sometimes do not have a registered call sign, in which case the prefix T is used followed by the aircraft registration number (i.e. tango november niner eight seven six quebec). Some variations of call signs exist to express safety concerns to all operators and controllers monitoring the transmissions. Aircraft call signs will use the suffix "heavy" to indicate a large aircraft, i.e. United Two-Five Heavy. For air ambulance flights, the callsign prefix Lifeguard is used before the normal callsign, i.e.Lifeguard three three alfa. Glider pilots often use a supplementary number (the competition number) in their call signs. Military flights use a variety of registered call signs with flight numbers, just like commercial operators. i.e. Navy Golf Alfa Kilo 21, REACH 31792. Ground facilities identify themselves by the name and function of the facility: i.e. Seattle Tower for the tower controller's position, or Boston Center for a en-route air traffic control facility.

Ships and Boats

Merchant vessels are assigned a call sign by their national licensing authority. In the case of states such as Liberia or Panama, which are flags of convenience for ship registration, call signs for larger vessels consist of the national prefix plus three letters (for example, 3LXYZ). United States vessels are given call signs beginning with the letter W.

Amateur radio

Amateur radio call signs are in the international series and normally consist of a one- or two-character prefix, a number (which sometimes corresponds to a geographic area within the country), and a 1, 2, or 3 character suffix. The number following the prefix is normally a single number (0 to 9). Some prefixes, such as Djibouti's (J2), consist of a letter followed by a number. Hence, in the hypothetical Djibouti call sign, J29DBA, the prefix is J2, the number is 9, and the suffix is DBA. The numbers are sometimes assigned geographically. In the Italian call sign, IK1TZO, IK is the prefix, the number component is 1 and corresponds to the Piedmont region, and TZO is the suffix. Another example is WB3EBO. WB is the prefix, the number 3 most often indicates that the station is located in Delaware, Maryland, Pennsylvania, or the District of Columbia, and the suffix is EBO. For district numbers within the United States, see [http://www.arrl.org/awards/was/map.gif ARRL map].

Broadcast call signs

North America

Broadcast stations in North America generally use call letters in the international series. There are some common conventions followed in each country. In Canada, call signs begin with the letter C, except for four stations in St. John's which begin with the letters VO; three of these predate Newfoundland's union with Canada in 1949, and the fourth was given special permission to adopt the callsign in 1981 because of its ownership association with one of