AUDIO SIGNAL DEMODULATING CIRCUIT WITH REDUCED POWER CONSUMPTION

摘要

PCT No. PCT/JP89/01087 Sec. 371 Date Aug. 6, 1990 Sec. 102(e) Date Aug. 6, 1990 PCT Filed Oct. 24, 1989 PCT Pub. No. WO90/04901 PCT Pub. Date May 3, 1990.In an audio signal demodulating circuit, an externally supplied reference clock signal is frequency-divided so that the frequency-divided clock signals are supplied to circuit units constituting the audio signal demodulating circuit as clock signals having lower frequencies. A logic circuit is provided to respond to a timing pulse generated synchronously with a video signal so as to set input data or clock signals supplied to the aforementioned circuit units to a low level or a high level during a time period other than the time period of an audio signal, whereby electric power consumption in the audio signal demodulating circuit is markedly reduced.