JPS56125142A - Identified reproduction circuit - Google Patents

Abstract

PURPOSE:To simplify constitution and to reduce the power consumption, by the identified reproduction through the use of a positive and a reverse clock signals for tri-state data, in an identified reproduction circuit for an input signal used for PCM relay device, etc. CONSTITUTION:The identified reproduction circuit of tri-state data consists of an identification circuit 5, gate circuit 6 and FFs 7, 8, and the positive and reverse data (a), (b) obtained from the input data are given to input terminals 9, 10, and clock signal C is input to terminal 17. The gate circuit 6 forms positive and reverse timing signals C, g from the clock signal C, the identified circuit 5 compares the data (a), (b) with the threshold value VR in positive phase timing. If the positive data is greater than the threshold value, the positive identification signal (d) is output, and if both the data are smaller than the threshold value, the zero identification signal (f) is output, and if both data are smaller than the threshold value, the zero identification signal (f) is output and it is fed to FFs 7, 8, and FF8 outputs the zero identification signal (h) during the reverse timing, and the positive reproduction signal (i) is output from the terminal 18 of FF7 and the negative reproduction signal (j) is output from the terminal 19.