Intercarrier sound detecting apparatus for a television...

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

H - Electricity

04

N

350/97

H04N 5/60 (2006.01) H04N 5/62 (2006.01)

Patent

CA 1190976

ABSTRACT OF THE DISCLOSURE: 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 extracing 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 heat signal component transmitted through the band pass filter.

416668

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