PPM decoder utilizing drop-out location information

Details PPM decoder utilizing drop-out location information PPM decoder utilizing drop-out location information

1995-04-19

1997-03-25

Beausoliel, Jr., Robert W.

Excavating

371 571, 360 46, 375239, 375224, H03M 504

Patent

active

056152230

ABSTRACT:
A method of and apparatus for decoding data from positive and negative pulses of an encoded pulse train, e.g. a NRZ pulse train for PPM encoding, wherein the recorded data is subject to drop-outs and drop-ins. Data bits are decoded from valid positive and negative pulses exceeding positive and negative peak pulse thresholds. Drop-outs are identified in the encoded pulse train as a function of read out positive and negative pulse magnitudes not exceeding positive and negative thresholds, and drop-out flags are provided in lieu of the respective positive and negative pulses. Decoded data bit signs are stored in memory locations, and drop-out flags are stored in memory locations in relation to the stored data bit signs such that the beginning and/or end of a drop-out in the encoded pulse train is indicated. Drop-out flags are also stored in response to the occurrence of two successive valid positive pulses or two successive valid negative pulses in the pulse train. Additionally, drop-out flags are stored in response to the time out of an interval between successive positive or negative pulses. The drop-out flag may also be stored in a memory location in relation to the preceding decoded data storage location such that the last valid data prior to the beginning of the drop-out in the encoded pulse train is indicated.

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