JPS57141099A - Sound recording and reproducing device - Google Patents

Abstract

PURPOSE:To reduce wow and flutter to prevent the degradation of the performance of the device, by reading and writing information from and to a storage device, which is provided between an A/D converting means and a D/A converting means, on a basis of an external command signal by the output signal of a microcomputer. CONSTITUTION:At a sound recording time, when a start switch 84 is turned on, a cpu circuit 7 outputs an upper address, a lower address, and a write instruction to an output port 73, an address bus 72, and a control line respectively to send them to a control circuit 6. The circuit 6 outputs an A/D trigger 61 to an A/D converter 2. Then, the output of an LPF1 is sampled and is subjected to A/D conversion and is sent to an RAM circuit 3. Next, an address signal 63 and a line pulse 62 are outputted to the circuit 3 in order. Thus, a digital sound recording signal 21 is stored in the memory of an address designated by the signal 63 of the circuit 3. At a reproducing time, the circuit 7 sets and outputs the same address as recording, and a read instruction is outputted through a control line 71 to the circit 3 to operate the circuit 6, and contents in a designated address of the circuit 3 are subjected to D/A conversion and have the waveform shaped by an LPF5 to take out an output signal.