| 摘要 |
<p>A video tape recorder for recording and/or reproducing a stereo frequency-modulated audio signal by a pair of carrier signals of an indispensable first carrier signal and an additional second carrier signal, comprises a circuit (20S) for demodulating the second carrier signal to provide a demodulated output, and a comparator (33) for comparing an amplitude of the demodulated output with a predetermined value, wherein when the amplitude of the demodulated output is below the predetermined value, it is determined that the second carrier signal exists. <IMAGE></p> |
