| 摘要 |
<p>PURPOSE:To execute the processing of a signal which has been demodulated, easily and also stably, by digitizing a circuit configuration so as to permit absorbing the timing jitter of a reproducing signal, and the running jitter of a recording medium. CONSTITUTION:A reproducing signal from a recording medium is amplified by a reproduction amplifying circuit 1, and becomes a pulse waveform. In the rise-up part and the breaking part of this pulse wave, monostable multivibrators 2, 3 operate, output pulses having narrow pulse width, input a differential waveform of a circuit 1 output to a counting circuit 5 through an off-gate 4, and reset the circuit 5. To an input 52 of this circuit 5 is provided an oscillation clock of frequency having a period of 1/16 times the shortest period of said differential wave, therefore, a clock signal T10 is obtained in an output of 1/16 frequency division of the circuit 5. Also, an output of the circuit 1 is stored in a buffer memory 6 by a reproducing clock from the circuit 5, and when it is read out by a clock which has been divided into 1/16 by a frequency dividing circuit 7, a reproducing signal T11 which is free from jitter can be obtained from the memory 6. Accordingly, a demodulated output T18 which is free from jitter can be obtained.</p> |
