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Decoder for Delay-Modulation Coded Data

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1 Author(s)
J. Lewin ; Astro-Electronics Division, RCA,Princeton,NJ

"Delay modulation," originally developed in conjunction with high density digital (saturation) tape recoding, combines the advantages of narrow bandwidth of pulse-code modulation (PCM) nonreturn to zero (NRZ) and the advantages of self-timing information inherent in phase modulation. This paper describes a decoding technique for the conversion of delay-modulated digital data to NRZ C data. A potential time-phase ambiguity in reception and decoding of delay-modulated data is resolved in real time, through monitoring the data stream for a unique waveform inherent in delay-modulated data. Statistical backup is provided. Included are logic implementation and timing diagrams.

Published in:

IEEE Transactions on Communication Technology  (Volume:19 ,  Issue: 5 )