Apparatus for detecting a voice frequency signal

Details Apparatus for detecting a voice frequency signal Apparatus for detecting a voice frequency signal

1976-09-10

1978-05-30

Claffy, Kathleen H.

H04M 150

Patent

active

040924998

ABSTRACT:
An apparatus for detection of a tone signal having a predetermined frequency among other tone signals, includes a combined band reject-band pass filter, amplitude limiting means and a product modulator. The signals appearing across the two outputs of the filter have different phases if an input signal has a frequency equal to the tone signal frequency. The value of the phase difference is converted to a DC-component by the limiting means and the modulator, and the magnitude of the DC-component forms an indication of the desired tone signal.

REFERENCES:
patent: 3501703 (1970-03-01), Baade
patent: 3593275 (1971-07-01), Phmpe

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