PURPOSE: To improve error rate, by using two code discriminating circuits different from threshold values for discrimination, as to a pattern having high possibility discriminating input signals subject to interference between codes in error.
CONSTITUTION: When two discriminating circuits 12, 13 output equal logical values, logical "0" appears at a comparison circuit 14, a gate circuit 15 is conductive, a gate circuit 19 is nonconductive, and the discrimination circuit 12 is transmitted to an output terminal 16. When an input signal at a terminal 11 receives distortion and enters a region where an error may be caused in the discriminating timing, the two circuits 12, 13 transmit the different discriminating result, the logical "1" is transmitted to the output of the comparison circuit 14, the gate circuit 15 is nonconductive and the gate circuit 19 is conductive. In this case, a signal in a storage circuit 17 by one bit before is inverted at an inverting circuit 18 and given to an output terminal 16.
MIKI TOSHIO
MUROTA KAZUAKI
OGOSE SHIGEAKI
