Abstract: A sound-multiplexed TV signal demodulator includes a stereo demodulation means having a first phase-locked loop of a first voltage controlled oscillator and also having a first frequency divider and a first comparator, an L-R demodulator and a matrix circuit, a SAP demodulation means having a second voltage controlled oscillator and a second comparator, a SAP detector detecting absence of the SAP signal to produce a detection signal when the SAP signal is not received, means by using a signal obtained from the first frequency divider for producing a reference signal having a frequency integer times as high as the frequency of the stereo pilot signal, and means for fixing the oscillation frequency of the second voltage controlled oscillator at the reference frequency in response to the detection signal.