| 摘要 |
PURPOSE:To reduce the error rate at the time of reproduction and improve the reliability, by providing a delay element corresponding to less than the detection window width of digital signals, coefficient instrument which changes the output gain of the delay element, a circuit for inverting the polarity of a signal, and their adder. CONSTITUTION:The high level and low level of input signals 61 are dependently detected by using two detecting circuits 83 through an inverter 84. The detecting circuit 83 for data width at a high level of the input signal 61 is constituted with a set of 2T- pulse detecting circuit 79 and coefficient instrument 81 and another set of 1.5T-pulse detecting circuit 80 and coefficient instrument 82 and, when 2T- and 1.5T-pulses of the input signal 61 are detected, the 2T-pulse output is intensified to a prescribed level as compared with the 1.5T-pulse, and then, outputted. This processing is also made in the case of an low level input. A synchronizing circuit 78 outputs the synchronizing circuit output signal 85 of input signals synchronizing to the 2T- and 1.5T-pulses detected by the detecting circuit 83 and a record compensating circuit output 91 is obtained by adding the signals 85-89 to each other at an adder circuit 90. Therefore, the error rate at the time of reproduction can be reduced and the reliability as a PCM sound recording and reproducing device can be improved. |
