Telegraphy – Code transmitters – Rotary contact
Patent
1975-10-29
1977-03-01
Griffin, Robert L.
Telegraphy
Code transmitters
Rotary contact
178 691, 325320, 329122, H04L 700, H04L 2722
Patent
active
040103234
ABSTRACT:
Sample timing recovery in a differentially coherent phase-shift keyed data transmission system is accomplished through the use of digital techniques. Samples of received phase-modulated signal waves taken at a rate high with respect to the carrier frequency are applied to a delay medium advantageously implemented by a shift register. Stored samples spaced by known carrier phase differences are compared for the purpose of detecting phase changes. Digital indications of such phase changes resulting from differentiation of comparator outputs are then effective to control a phase-locked oscillator and provide a substantially jitter-free timing recovery wave without using excess bandwidth for the transmitted wave.
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Bell Telephone Laboratories Incorporated
Bookbinder Marc E.
Griffin Robert L.
Kearns Joseph P.
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