| 摘要 |
<p>PURPOSE:To simplify the recording operation by setting the content of start information of a code signal to a prescribed value for a prescribed time when the music head in an input signal is detected before the input signal is modulated. CONSTITUTION:Right/left channel signals are added by an adder circuit 21. The output of the circuit 21 is inputted to a comparator circuit 22, compared with a reference level 23 and the circuit 22 outputs a low level signal when the input signal is below the reference level or below and outputs a high level signal when more than the reference level. A time comparison circuit 24 outputs a low level signal when the low level signal outputted by the circuit 22 is shorter than the reference time and outputs a high level signal when longer. A detection circuit 26 outputs a detection signal when both the outputs of the circuit 24 are at high level. That is, the detection signal is outputted in the timing when the music head is inputted. A counter circuit 27 outputs a high level signal for a prescribed time when the music head is detected. A code control circuit 28 sets a start ID to logical '1' during this time.</p> |
