| 摘要 |
An apparatus for determining if a received binary word corresponds to the true or complement version of a stored binary word includes means for serially multiplexing the bits of each binary word to the inputs of an exclusive OR gate. The exclusive-OR gate generates a logical high signal each time a mismatch occurs. These signals are applied directly to an error counter and, after inversion, to a match counter. The contents of the error counter and match counter are compared to a stored threshold number. A first signal is generated if the contents of the error counter exceeds the threshold. A second signal is generated if the contents of the match counter exceeds the threshold. Upon the occurrence of both signals, the serial comparison process is terminated.
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