초록 ▼

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 s

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.

대표청구항 ▼

A method of correcting errors in scrambled digital communication, said method comprising the steps of: (a) providing digital signals for encoding and scrambling; (b) encoding said signals in a convolution encoder means having a transmit input and output with said transmit input coupled to receive sa

A method of correcting errors in scrambled digital communication, said method comprising the steps of: (a) providing digital signals for encoding and scrambling; (b) encoding said signals in a convolution encoder means having a transmit input and output with said transmit input coupled to receive said digital signals and said transmit output coupled to a transmission path; (c) scrambling said digital signals by including a first random generator means coupled between a source of said digital signals and said transmit input and between said transmit output and said transmission path whereby said scrambler means is coupled in parallel with said convolutional encoder means; (d) transmitting said digital signals from said transmit output to said transmission path; (e) applying signals transmitted over said transmission path to the convolution decoder means having a receive input and a receive output with said receive input being coupled to said transmission path and said receive output being coupled to a system output terminal; (f) descrambling of said transmitted signals by including a second random generator means coupled between said transmission path and said receive input whereby a means for accomplishing said descrambling is coupled in parallel with said decoder; (g) operating said first and second random generator means operating in the same pattern; and (h) monitoring a code error in said decoder, thereby synchronizing said second random generator.