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The A.C. Nielsen company, which continues to measure television ratings today, took over American radio's ratings beginning with the 1949–50 radio season and ending in 1955–56. During this era, nearly all of radio's most popular programs were broadcast on one of three networks: NBC Red, NBC Blue, or CBS' Columbia network.
A table radio is a small, self-contained radio receiver used as an entertainment device. Most such receivers are limited to radio functions, though some have compact disc or audio cassette players and clock radio functions built in; some models also include shortwave or satellite radio functionality. [1] [2] [3]
Nielsen Media Research ( NMR) is an American firm that measures media audiences, including television, radio, theatre, films (via the AMC Theatres MAP program), and newspapers. Headquartered in New York City, it is best known for the Nielsen ratings, an audience measurement system of television viewership that for years has been the deciding ...
Nielsen Audio (formerly Arbitron) is a consumer research company in the United States that collects listener data on radio broadcasting audiences. It was founded as the American Research Bureau by Jim Seiler in 1949 and became national by merging with Los Angeles–based Coffin, Cooper, and Clay in the early 1950s.
The current age ratings (enacted in 2002) are: Todo Espectador – All spectators. Mayores de 14 años – 14 years old and over. Mayores de 18 años – 18 years old and over. The age ratings may also be supplemented by the following content categories: Contenido educativo – Educational content.
Birch ratings. Birch Radio Ratings and BIrch/Scarborough Research, founded by Tom Birch, was a United States media audience measurement service that was founded in 1978 and grew internally and through acquisitions in the 1980s and grew to be a major challenger to once-dominant Arbitron.
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