Receiver for data-transmission system operating with single-side

Details Receiver for data-transmission system operating with single-side Receiver for data-transmission system operating with single-side

1979-10-17

1981-06-09

Pitts, Harold I.

Pulse or digital communications

Repeaters

Testing

375 17, H04L 300

Patent

active

042728452

ABSTRACT:
A receiver for three-level data signals transmitted by single-sideband amplitude modulation with an attenuated carrier, including an amplitude demodulator driven by the extracted carrier, comprises a phase shifter in the carrier input of the demodulator controlled by a phase-error detector which compares the demodulated baseband signals with a pair of balanced voltage thresholds to correct spurious phase shifts between that signal and the carrier. The phase-error detector receives timing pulses from a sync extractor comparing the baseband signal with two other balanced voltage thresholds and summing the results to control a local oscillator with a phase-locking loop. The phase shifter may be manually precalibrated to maximize the amplitude of a synchronizing signal in the output of the summing circuit of the sync extractor, that amplitude being proportional to the width of an eye diagram obtained from the baseband signal.

REFERENCES:
patent: 3860871 (1975-01-01), Ninoshita

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