Disk recording and sound reproducing device using pitch change and

Abstract

In a disk recording and sound reproducing device, a disk is intermittently accessed for data read out to write the disk readout data into a memory. The written data in the memory are continually read out and expanded to output the expanded data as playback data signals. Data to be recorded are continually written into the memory, during which time the data to be recorded are intermittently read out from the memory 10 to be demodulated so as to record the demodulated data onto the disk. A clock controller, in accordance with a pitch change instruction, varies the rate of data readout from the memory (in reproduction) or the rate of data writing into the memory (in recording). Corresponding to the data readout or writing rate, a memory controller controls the intervals at which the data are read out from the disk (in reproduction) or the intervals at which the data are recorded onto the disk (in recording). Further, in accordance with a timing shift instruction, a system controller varies the intervals between the intermittent data writing into the memory so as to selectively change the reproduction timing of a specific portion of the data.