Rf volume control circuit

Details Rf volume control circuit Rf volume control circuit

H - Electricity

04

N

350/97

H04N 5/62 (2006.01)

Patent

CA 1227567

RF VOLUME CONTROL CIRCUIT Abstract of the Disclosure A TV remote volume control includes an RF input for re- ceiving the video modulated RF carrier and the audio modulated RF carrier, both with common mode spurious deviation. The audio mo- dulated RF carrier is demodulated to provide a baseband audio signal without common mode spurious deviation. The video modu- lated RF carrier is used to provide a video RF carrier signal with common mode spurious deviation. The baseband audio is volume con- trolled and the volume controlled baseband audio is then used to provide an audio modulated IF carrier. The volume controlled audio modulated IF carrier is combined with the video carrier with common mode spurious deviation to provide a volume controlled audio modulated RF carrier with common mode spurious deviation. -1-

492470

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