System of encoding digital signals intended for transmission and

Details System of encoding digital signals intended for transmission and System of encoding digital signals intended for transmission and

1990-12-20

1993-06-08

Safourek, Benedict V.

Pulse or digital communications

Spread spectrum

Direct sequence

358138, 371 371, H04N 1102

Patent

active

052186229

ABSTRACT:
A system of encoding digital signals comprising a source encoder followed by a transmission channel encoder, which is characterized in that in the case in which the source encoder is a variable-length encoding circuit (10), the channel encoder comprises a series arrangement of a sub-assembly of encoding with selective protection and a sub-assembly of encoding without selective protection. The signals being arranged in information component blocks. The system includes a stage for encoding lengths of blocks for determining along the block an accumulated length of code words supplied by said source encoder and ensuring the encoding of block lengths thus determined, a stage for selective protection of said blocks and a stage for multiplexing the signals supplied by said length encoding and selective protection stages. The corresponding decoding system comprises a transmission channel decoder followed by a source decoder, the channel decoder comprising a series arrangement of a sub-assembly for decoding with non-selective protection and a sub-assembly for decoding with n levels of selective protection.

REFERENCES:
patent: 4633483 (1986-12-01), Takahashi et al.
patent: 4782387 (1988-11-01), Sabri et al.
patent: 4939583 (1990-07-01), Tsuboi et al.
patent: 4982282 (1991-01-01), Saito et al.

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