Importance

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Abstract

Coder-decoder for a transmission channel for digital signals, said signals being constituted by a sequence of bits between a more significant bit formed by a sign bit and a less significant bit. The coder-decoder comprises on the one hand a coder constituted by a circuit able to extract the more significant bit e.g. 1 from the indicated incident digital signal, a recurrent coding circuit of ratio 2 receiving bit EB1 and supplying two redundant bits EB1a and EB1b, means for forming a coded signal having the same number of bits as the incident signal with bit EB1a as the most significant bit, the least significant bit of the incident signal being eliminated and bit EB1b being inserted between two given bits of the incident signal and on the other hand a decoder which comprises means for extracting the redundant bits EB1a and EB1b from the coded signal, a recurrent decoding circuit receiving the two bits EB1a and EB1b and supplying a sign bit EB1b, a pseudo-random bit generator and means for restoring a digital signal having the signal bits received other than EB1a and EB1b between the sign bit taken as the most significant bit and the pseudo-random bit taken as the least significant bit.

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First Claim