Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1979-10-22
1981-01-27
Safourek, Benedict V.
Pulse or digital communications
Spread spectrum
Direct sequence
370100, 371 42, 375118, H04L 700
Patent
active
042479452
ABSTRACT:
Recovery of eight-bit data characters imbedded in the time slots of a train of data bytes individually having six slots available is implemented by a process which locates the bit alignment of a first one of the characters and executes a sequence of assembly procedures to appropriately form this and subsequent characters. The data characters are available as bursts of data characters preceded by synchronizing words having a predetermined bit sequence to create data blocks, the sequential bits of the block being inserted in sequential available slots of the byte train. Recovery is accomplished by comparing the bits of each byte with stored patterns corresponding to overlapping portions of the synchronizing word. A comparison match identifies the bit location of the first character in the burst to thereby define one of a plurality of assembly procedures which process the bits in the identified locations to form the character. The assembly procedure then defines the next subsequent assembly procedure to be executed.
REFERENCES:
patent: Re29215 (1977-05-01), Carney et al.
patent: 3603735 (1971-09-01), Cleobury
patent: 3831142 (1974-08-01), Fletcher
patent: 3961311 (1976-06-01), Pavoni et al.
patent: 4161719 (1979-07-01), Parikh et al.
Bell Telephone Laboratories Incorporated
Lipton Roy C.
Safourek Benedict V.
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