Intercarrier sound detecting apparatus for a television receiver

Details Intercarrier sound detecting apparatus for a television receiver Intercarrier sound detecting apparatus for a television receiver

1982-11-30

1985-11-05

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358198, 375 81, H04N 562, H04N 560

Patent

active

045517568

ABSTRACT:
An intercarrier sound detecting apparatus for a television receiver includes an antenna for receiving a television signal; a tuner for selecting a desired frequency range of the received television signal from the antenna and producing a tuned signal having a video intermediate frequency component in response thereto; a filter for extracting the video intermediate frequency component from the tuned signal; video intermediate frequency amplifiers for producing a video intermediate frequency signal having an amplitude-modulated video carrier component, in response to the extracted video intermediate frequency component; a phase-locked loop which phase-locks the video intermediate frequency signal with respect to the amplitude-modulated video carrier component thereof and produces an output signal having a 4.5 MHz beat signal component in response thereto; a band pass filter for transmitting substantially only the 4.5 MHz beat signal component; and a frequency discriminator for producing a sound signal in response to the 4.5 MHz beat signal component transmitted through the band pass filter.

REFERENCES:
patent: 4365205 (1982-12-01), Dehaene
patent: 4392254 (1983-07-01), Ecklund
patent: 4490743 (1984-12-01), Mycynek et al.

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