Frequency translation phase-locked loop television sound detecti

Details Frequency translation phase-locked loop television sound detecti Frequency translation phase-locked loop television sound detecti

1982-08-30

1984-09-04

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358197, H04N 562

Patent

active

044700709

ABSTRACT:
A frequency translation phase-locked loop (PLL) is provided for detecting the audio information from a television signal. The PLL includes a mixer and a phase detector, responsive to the intermediate picture and sound carriers respectively, which carriers are amplified by a single IF amplifier. A first filter is coupled between the output of the television receiver tuner and the input of the IF amplifier and has a frequency response for passing the picture and sound carriers. The input of the mixer is coupled to the output of the IF amplifier and is substantially responsive to the amplified picture carrier. The phase detector has a first input also coupled to the output of the IF amplifier and is substantially responsive to the amplified sound carrier and a second input coupled to the output of the mixer. A second filter coupled to one of the first and second inputs of the phase detector has an amplitude versus frequency response which provides a predetermined attenuation at the frequency of the picture carrier and substantially less attenuation at the frequency of the sound carrier. A lowpass filter coupled to the output of the phase detector provides the detected audio information.

REFERENCES:
patent: 4419695 (1983-12-01), Yamamoto
"Intercarrier Buzz Phenomena Analysis and Cures" by P. Fockens and C. G. Ellers, Published in IEEE Transactions on Consumer Electronics, Aug. 1981, pp. 381-397.
Phaselock Techniques by Floyd M. Gardner, Published by John Wiley and Sons, Inc. 1966, Chapter 8-4.

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