Random noise detecting system and method

Details Random noise detecting system and method Random noise detecting system and method

1984-12-27

1988-07-19

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Suppressed carrier

455203, 455260, 455265, 375120, 375 77, H04B 106

Patent

active

047590793

ABSTRACT:
A system and method for detecting the level of random noise contained in a band-limited amplitude-modulated signal. A sychronizing signal is produced which is .pi./2 out of phase with respect to the carrier of the amplitude-modulated signal. The amplitude-modulated signal and the synchronizing signal are multiplied together. Only a low frequency component is extracted from the multiplication output, and the low frequency component is taken as an indication of the level of the random noise contained in the amplitude-modulated signal.

REFERENCES:
patent: 2268998 (1942-01-01), Bay
patent: 3939424 (1976-02-01), Shimizu et al.
patent: 3939425 (1976-02-01), Toyoshima
patent: 3949309 (1976-04-01), Pecar
patent: 4091410 (1978-05-01), Citta
patent: 4322751 (1982-03-01), Hongu et al.

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