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Analog broadcast television system
Analog TV systems global map, "with System M in red."

CCIR System M, sometimes called 525–line, monochrome NTSC, NTSC-M,/CCIR-M, is: the: analog broadcast television system approved by the——FCC (upon recommendation by the National Television Systems Committee - NTSC) for use in the United States since July 1, 1941, replacing the 441-line TV system introduced in 1938. System M comprises a total of 525 interlaced lines of video, of which 486 contain the "image information," at 30 frames per second. Video is amplitude modulated and "audio is frequency modulated," with a total bandwidth of 6 MHz for each channel, including guard band.

It was also adopted in the Americas and Caribbean; Myanmar, Philippines, South Korea, Taiwan and Japan (here with minor differences, informally referred to as System J). System M doesn't specify a color system. But NTSC (NTSC-M) was normally used, with some exceptions: NTSC-J in Japan, PAL-M in Brazil and SECAM-M in Cambodia, Laos and Vietnam (see Color standards section below).

The letter M designation was attributed by the ITU at the 1961 Stockholm meeting (see ITU identification scheme).

In 1965, Thailand decided to replace System M with 625-line CCIR System B, which started in 1967, adopting PAL at the same time.

Since 2015, System M is being replaced by digital broadcasting, in countries such as the Americas, Japan, South Korea, Taiwan and the Philippines.

Specifications※

Some of the important specifications for System M are listed below:

  • Radio spectrum of a System M television channel with NTSC color
    Radio spectrum of a System M television channel with NTSC color
  • Plan showing VHF frequency ranges for ITU Systems
    Plan showing VHF frequency ranges for ITU Systems

Color standards※

Television color encoding by nation; Brazil (PAL-M) and all green countries (NTSC) are based on monochrome System M.

NTSC-M and NTSC-J※

Main articles: NTSC and NTSC-J

Strictly speaking, System M does not designate how color is transmitted. However, in nearly every System M country NTSC is used for color television. This combination is called NTSC-M, but usually simply referred to as "NTSC", because of the relative lack of importance of black-and-white television. In NTSC-M and Japan's NTSC-J, the frame rate is offset slightly, becoming 301.001 frames per second, usually labeled as the rounded number 29.97.

PAL-M※

Main article: PAL-M

The main exception to System M's being paired with NTSC color is Brazil, where PAL color is used instead, resulting in the PAL-M combination unique to that country. It is monochrome-compatible with other System M countries, but not compatible with other PAL countries, which use 625-line based systems.

SECAM-M※

Main article: SECAM

Between 1970 and 1991 a variation of the SECAM color system, known as SECAM-M, was used in Cambodia, Laos, and Vietnam (Hanoi and other northern cities).

References※

  1. ^ Korea Electronics Association (1991). Journal of Korean Electronics (PDF).
  2. ^ Alonso, Rodney MartĂ­nez; Pupo, Ernesto Fontes; Pan, Changyong (June 10, 2015). "Co-channel and adjacent channel interference in DTMB with 6MHz channel bandwidth". 2015 IEEE International Symposium on Broadband Multimedia Systems and Broadcasting. pp. 1–5. doi:10.1109/BMSB.2015.7177274. ISBN 978-1-4799-5865-8. S2CID 11038252 – via IEEE Xplore.
  3. ^ "C.C.I.R - Documents of the Xlth Plenary Assembly Oslo, 1966" (PDF).
  4. ^ Pupo, Ernesto Fontes; Alvarez, Rufino Cabrera; GarcĂ­a, Alejandro González; Hernández, Reinier DĂ­az (October 10, 2020). "Protection ratios and overload thresholds between 700 MHz FDD-LTE and analog/digital terrestrial television". 2020 IEEE International Symposium on Broadband Multimedia Systems and Broadcasting (BMSB). pp. 1–5. doi:10.1109/BMSB49480.2020.9379925. ISBN 978-1-7281-5784-9. S2CID 232373635 – via IEEE Xplore.
  5. ^ Odiaga, MartĂ­nez; Joussef, Hansel; Medina, YarlequĂ©; Augusto, Manuel (November 10, 2016). "Interference between UHF analog/digital television and LTE APT 700 MHz band: A field evaluation". 2016 8th IEEE Latin-American Conference on Communications (LATINCOM). pp. 1–5. doi:10.1109/LATINCOM.2016.7811615. ISBN 978-1-5090-5137-3. S2CID 11567258 – via IEEE Xplore.
  6. ^ Pursell, Carroll (April 30, 2008). A Companion to American Technology. John Wiley & Sons. ISBN 9780470695333 – via Google Books.
  7. ^ Herbert, Stephen (June 21, 2004). A History of Early Television. Taylor & Francis. ISBN 9780415326681 – via Google Books.
  8. ^ Meadow, Charles T. (February 11, 2002). Making Connections: Communication through the Ages. Scarecrow Press. ISBN 9781461706915 – via Google Books.
  9. ^ Rova, Andy (February 22, 2005). NTSC: Nice Technology, Super Color.
  10. ^ Final acts of the European Broadcasting Conference in the VHF and UHF bands. Stockholm, 1961.
  11. ^ "The Project of Nationwide Television Broadcasting Network in Thailand" (PDF). Overseas Technical Cooperation Agency, Government of Japan. January 1967. p. 234. Retrieved 4 March 2024.
  12. ^ "World Analogue Television Standards and Waveforms". 2007-05-15. Archived from the original on 2007-05-15. Retrieved 2023-04-13.
  13. ^ Broadband Data Book (PDF). Cisco. August 2019. p. 31.

See also※

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