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Abstract

An error correction code data communication system scrambles and descrambles both non-coded data and coded data by using substantially the same code process at the opposite ends of a transmission path. The frequency of the occurrence of an error correction pulse in a decoder is monitored to set up synchronization for descrambling. The transmitter includes an encoder for adding a correction code to a data signal to be transmitted, and a scrambler for randomizing the data signal. The receiver includes a descrambler for descrambling the data signal which was randomized by the scrambler, and a decoder for correcting a code error responsive to the error correction code. The scrambler modulo 2 adds an output of a random signal generator to both an input data signal and an output data signal. The descrambler modulo 2 adds an output of a second random signal generator to both an input data signal and an output data signal.

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