Apparatus for identifying coded information without internal clo

Details Apparatus for identifying coded information without internal clo Apparatus for identifying coded information without internal clo

1981-05-26

1983-07-26

Safourek, Benedict V.

Pulse or digital communications

Spread spectrum

Direct sequence

307269, 371 6, 382 41, H04L 708

Patent

active

043957730

ABSTRACT:
A self-synchronized apparatus for recognizing identifying codes especially n missiles and spacecraft. The apparatus comprises a video quantizer for receiving bipolar video input signals and providing an output of validly timed data to a decode register which is clocked by a free running oscillator. The decode register defines a valid mark as "K" high bits followed by "K" low bits where 2K is the capacity of the decode register. A constant width decoder compares the first K bits in a sequential, pairwise fashion with the inverse of the values of the second K bits. The constant width decoder ANDs the pairwise comparison outputs to insure that "K" high bits are followed by "K" low bits before a "mark" signal is produced. A derivative data buffer receives the "mark" signals. A synchronous counter is coupled to the derivative buffer and the free running oscillator to produce one output pulse for every N oscillator output pulses. The inputs of the derivative buffer presets the sync counter to synchronize the derivative clock output with the actual data as transmitted.

REFERENCES:
patent: 3317669 (1967-05-01), Ohnsorge
patent: 3591720 (1969-10-01), Othmer
patent: 3609391 (1969-06-01), Hatano
patent: 3760355 (1973-09-01), Bruckert
patent: 3909724 (1975-09-01), Spoth et al.
patent: 4124898 (1978-11-01), Munter
patent: 4185273 (1980-01-01), Gowan
patent: 4242755 (1980-12-01), Gauzan
patent: 4293949 (1981-10-01), Philippides

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