PURPOSE: To freely stop a recorder accurately while no recording is required, by delaying an audio signal in matching with a mechanical delay of the recorder, and recording the audio signal to be recorded entirely.

CONSTITUTION: Left and right outputs of an FM receiver 1 are A/D-converted with ADPCM at audio analyzers 2a and 2b and stored in storage devices 3a and 3b. Audio synthesizers 4a and 4b perform D/A conversion. On the other hand, a comparison circuit 5 compares the output of the analyzers 2a and 2b and a counter 6 is incremented or decremented depending on coincidence/discidence signals. A carrier or a borrow signal is outputted depending whether the number of coincidence signals are more or less than the discidence signal (5). A set output of an FF7 is inputted to the 1st shift register 8 with this signal and a gate circuit is closed after one second and the input signal to a recorder 11 is lost. The recorder 11 is stopped after further 3 seconds with the output of the 2nd shift register 9. The recorder 11 is started with the borrow signal of the counter 6.