Pulse or digital communications – Repeaters – Testing
Patent
1980-07-25
1982-09-28
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
375 80, 329112, 179 84VF, H04L 2714
Patent
active
043521940
ABSTRACT:
A system for determining the frequency of any received tone segment of N possible time synchronous tone segments each having a period T.sub.1 and each having one of N predetermined frequencies. The system comprises a first shift register having M stages, a second register also having M stages each being aligned with one of the M stages of the first shift register, sampling logic for samping each received tone segment into P samples where P is less than M and P-M=L, and logic for serially entering the P samples into the first shift register. Also provided is a time generator for generating 2N I and Q sampled reference tones each having P samples and representing one of the N predetermined frequencies, and for successively entering the 2N sampled reference tones into the second register at a rate M/WT.sub.1 in positions in the second register successively displaced by W stages thereof so that each sampled reference tone is then successively aligned with the sampled received tone segment whose frequency is being determined, where 2NW is .ltoreq.L. Comparing logic is provided for comparing the quantized input tone segment with each quantized reference tone to determine the reference tone that most closely correlates with the input tone segment.
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Chin Stephen
Cohen Samuel
Pillion Donald W.
RCA Corporation
Safourek Benedict V.
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