Apparatus for digital data synchronization
First Claim
1. A digital communication system for processing a data bit stream having a length M, said bit stream including a predetermined initial identification bit sequence, the system comprising:
- encoder means for encoding said data bit stream including;
encoder bit storage means having N predetermined sync bits stored therein;
combining means for predeterminedly combining said N sync bits with said M data bits to thereby produce a transmission bit stream having a bit length less than M+N;
decoder means for decoding said transmission bit stream including;
decoder sync bit storage means having said N predetermined sync bits stored therein;
processing means for predeterminedly processing said transmission bit stream with said N sync bits to thereby regenerate said data bit stream;
identification bit storage means having said initial identification bit sequence stored therein; and
detector means for comparing the regenerated data bit stream with the contents of said identification bit storage and producing a detect indication output responsive to a predetermined minimum correlation therebetween to allow passage of the remainder of the regenerated bit stream to an output terminal.
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Abstract
A system, including an encoder and decoder, for the transmission of digital information over a transmission medium. The encoder processes a data stream of length M and generates a transmission bit stream. The processing includes combination of the M data bits with N predetermined sync bits, via a modulo-2 adder. The resulting transmission stream has a total length less than M+N, thereby substantially minimizing the number of bits otherwise required.
The decoder regenerates the data bit stream by modulo-2 subtraction of the transmission bit stream with said N sync bits, stored within the decoder.
The resulting system thereby provides optimum synchronization and, therefore, data recovery, while requiring a minimum of transmission bits.
38 Citations
2 Claims
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1. A digital communication system for processing a data bit stream having a length M, said bit stream including a predetermined initial identification bit sequence, the system comprising:
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encoder means for encoding said data bit stream including; encoder bit storage means having N predetermined sync bits stored therein; combining means for predeterminedly combining said N sync bits with said M data bits to thereby produce a transmission bit stream having a bit length less than M+N; decoder means for decoding said transmission bit stream including; decoder sync bit storage means having said N predetermined sync bits stored therein; processing means for predeterminedly processing said transmission bit stream with said N sync bits to thereby regenerate said data bit stream; identification bit storage means having said initial identification bit sequence stored therein; and detector means for comparing the regenerated data bit stream with the contents of said identification bit storage and producing a detect indication output responsive to a predetermined minimum correlation therebetween to allow passage of the remainder of the regenerated bit stream to an output terminal. - View Dependent Claims (2)
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Specification