| 摘要 |
PURPOSE:To prevent remaining data from being accumulated in a RAM by writing a reproduced/demodulated digital signal in order to prevent jitters and by phase-synchronizing a read clock for reading it with a reproduction clock. CONSTITUTION:A digital audio reproduction signal such as a PCM, which is reproduced by a video disk player, etc., is demodulated in a demodulator 8 and written in a RAM11 by a clock through a reproduction clock extraction circuit 9, a frequency divider circuit 14, etc. The RAM11 is read out by a read clock synchronous with a reproduction clock through the circuit 9, frequency divider circuits 15 and 16, a PLL circuit of a phase comparator, an LPF18, a voltage control oscillator 19, etc., and a frequency divider 20, and becomes a demodulated output after jitters are removed. By the constitution employing the read clock synchronous with the reproduction clock, frequency errors of the read clock never occur, and data will not remain in a RAM; therefore the accumulation of remaining data can be prevented. |
