Demodulator audio of a television system pal, and more particularly, a circuit designed to use a demodulator audio in common in the television system pal.

摘要

P a) a demodulator audio of a television system pal, and more particularly, a circuit designed to use a demodulator audio in common in the television system pal. & br / b), characterized in that it comprises: & br / - a first means of oscillation (24) to generate signals of a first to third frequency applied respectively to the systems pal - b / g, i, d / k, by using the first to third input voltages of the control; & br / - a means for generating signals of the intermediate frequencies video and audio by mixing the intermediate frequency signal with one of the three signals of frequencies supplied by the first means of oscillation; & br / - a means for filtering out only the intermediate frequency signal from the audio signals of the intermediate frequencies video and audio; & br / - a second oscillation (27) for generating a fourth frequency signal in order to convert the frequency of the intermediate frequency signal audio filtered. / p