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Broadcast Radio Subcarriers or Subsidiary …
https://www.fcc.gov/media/radio/subcarriers-sca
Subcarrier - Wikipedia
https://en.wikipedia.org/wiki/Subcarrier
Transmission of a PCM Telemetry Subcarrier with a …
https://repository.arizona.edu/bitstream/handle/10150/612078/ITC_1991_91-762.pdf;sequence=1
as an FM subcarrier carrying a pulse-code modulated [PCM] digital signal. Transmitting a video signal with an auxiliary subcarrier isn’t new—while early commercial TV system designs had a separate transmitter for sound and video, newer designs transmit the audio as a subcarrier 4½ MHZ above the AM video carrier.
analog - Why the audio subcarrier is never transmitted ...
https://electronics.stackexchange.com/questions/247605/why-the-audio-subcarrier-is-never-transmitted-with-baseband-analogue-video-signa
It should not significantly affect the quality of either video (as the audio subcarrier is outside the video bandwidth) or audio (as the audio carrier frequency of, depending on region, 4.5-6.5 MHz - and its bandwidth - are high enough to encode all audible frequencies). Stereo could also be carried the usual broadcast way ( MTS, A2 or NICAM ).
Electronic – Why the audio subcarrier is never transmitted ...
https://itectec.com/electrical/electronic-why-the-audio-subcarrier-is-never-transmitted-with-baseband-analogue-video-signal/
It should not significantly affect the quality of either video (as the audio subcarrier is outside the video bandwidth) or audio (as the audio carrier frequency of, depending on region, 4.5-6.5 MHz – and its bandwidth – are high enough to encode all audible frequencies). Stereo could also be carried the usual broadcast way (MTS, A2or NICAM).
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