MISCELLANEOUS LEGISLATION TEXT FOR SHIFTWORKS

摘要

During the reading of certain combinations of bits from a magnetic disk memory surface, wider than normal separations may occur between positive and negative peaks. In order to eliminate false peak readings to be decoded by the decoding circuitry, a delayed readback signal is compared with the undelayed signal in a pair of polarity discriminators. The delayed signal is also differentiated to provide a complementary output. Zero crossing detectors are connected to receive the complementary outputs and are gated by the polarity discriminators. The output of the detectors is connected to a latch circuit which sets and resets according to zero crossing detections. An output circuit develops a peak indicating pulse whenever the latch changes state, which is utilized by subsequent circuitry to generate the decoded digital signal.