Method of processing a signal, and corresponding devices

Details Method of processing a signal, and corresponding devices Method of processing a signal, and corresponding devices

1975-07-31

1977-04-12

Smith, Alfred E.

Wave transmission lines and networks

Automatically controlled systems

With control of equalizer and/or delay network

307229, 307240, 329 50, 333 76, H03H 728, H03D 318, H03H 715, H03H 750

Patent

active

040178129

ABSTRACT:
In the synchronous detection signals of frequency Fo immersed in a noise, an auxiliary signal is produced having a period 1/2 Fo and in the form of a rectified symmetrical wave, by rectifying a symmetrical wave of period 1/Fo. The signal to be filtered is multiplied by the auxiliary signal and synchronous filtering or synchronous detection on the frequency Fo is performed on the signal obtained after the above-mentioned multiplication. Preferably the auxiliary signal is produced in the form of a rectified sinusoidal wave and a square wave reference signal from which the above-mentioned symmetrical wave is derived, having the period 1/Fo, is also used to control the synchronous detection or the synchronous filtering.

REFERENCES:
patent: 3403345 (1968-09-01), Frank et al.
patent: 3432761 (1969-03-01), Morine
patent: 3483546 (1969-12-01), Ausfeld
patent: 3493876 (1970-02-01), Zimmerman
patent: 3729695 (1973-04-01), Condon
patent: 3774125 (1973-11-01), Condon et al.
patent: 3793599 (1974-02-01), Coor
patent: 3867620 (1975-02-01), Coor

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