JPS647374A - Pcm device - Google Patents

Abstract

PURPOSE:To eliminate the need for the control for generating forcibly a memory clear period externally through the use of a microcomputer or the like by writing 0s to a memory area of a readout signal just after the recording signal is read out of the memory. CONSTITUTION:When a block clock 4a is outputted from a recording clock generating circuit 618A, an address control circuit 605 updates addresses 5d, 5c. Then an R/W clock generating circuit 5 receives a readout symbol clock 4c to generate a latch clock 5a and a selection signal 5b of a selector 3. The data in the memory 1 designated by the addresses 5d, 5c by using the clock 5a is latched by a latch 2 and recorded on a tape. On the other hand, an input A of the selector 3 is selected for the 0 period by the signal 5b and 0s are inputted to the memory 1. A clock 5e is applied to the memory 1 from the circuit 5 in the same timing as the 0 period of the signal 5b resulting that the memory slot read out already is 0. The same operation is repeated successively.