Television sound detection system using a frequency translation

Details Television sound detection system using a frequency translation Television sound detection system using a frequency translation

1982-08-30

1984-09-04

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358197, H04N 562

Patent

active

044700717

ABSTRACT:
A frequency translation phase-locked loop (PLL) is provided for detecting the audio information from a television signal. A voltage controllable oscillator having a nominal oscillation frequency equal to the frequency difference between the intermediate frequency (IF) picture and sound carriers provides one input to a mixer and a substantially unmodulated picture carrier is supplied as the other input to the mixer. A phase detector has as its first input the output signal from the mixer and as its second input the sound carrier. A lowpass filter coupled between the output of the phase detector and a control input to the VCO completes the PLL. The detected audio information is provided at the output of the lowpass filter.

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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