Patent
1976-05-21
1977-07-12
Safourek, Benedict V.
325302, 325306, 325478, 325474, 325363, 325 56, 325 65, 325 67, H04B 708, H04B 116
Patent
active
040357295
ABSTRACT:
In a system for selecting one of a plurality of signal transmission paths, a circuit is provided for each path to indicate the quality of an audio signal delivered by the path. The circuit comprises a log amplifier, an envelope detector and indicating means including a signal detector, a noise detector and a difference amplifier. The log amplifier monitors the audio signal and produces a logarithmic signal having an amplitude which varies as the log of the amplitude of the audio signal. The envelope detector produces an envelope signal corresponding to the envelope of the peak amplitude excursions of the logarithmic signal. The maximum excursions of the envelope signal represent signal content of the audio signal and the minimum excursions represent noise content. The indicating means produces a quality signal having a magnitude representative of the difference between the amplitude of the maximum and minimum excursions of the envelope signal. This magnitude is representative of the logarithm or the signal-to-noise ratio of the audio signal. The quality signals from the indicating means in all of the circuits are compared and the signal transmission path delivering the highest quality audio signal is selected for connection to a utilization device.
REFERENCES:
patent: 3235807 (1966-02-01), Appel
patent: 3238457 (1966-03-01), Boymel et al.
patent: 3605018 (1971-09-01), Covlello
patent: 3628149 (1972-12-01), Swan
patent: 3729681 (1973-04-01), Elder
patent: 3729682 (1973-04-01), Elder
patent: 3916316 (1975-10-01), Hearn et al.
Chin Tommy P.
General Electric Company
Kraus Robert J.
Safourek Benedict V.
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