Frequency translation phase-locked loop for separate or intercar

Details Frequency translation phase-locked loop for separate or intercar Frequency translation phase-locked loop for separate or intercar

1982-10-29

1985-04-16

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 562

Patent

active

045119244

ABSTRACT:
A frequency translation phase-locked loop (PLL) is provided for detecting the audio information from a received television signal. The PLL includes a switching arrangement which, in a first position causes the loop to process the IF picture and sound carriers for detecting the audio information in an intercarrier type of detection method and, in a second position causes the loop to process the IF sound carrier for detecting the audio information without the use of the received picture carrier, in a "separate" (split-sound) type of audio detection method.

REFERENCES:
Phaselock Techniques, by Floyd M. Gardner, published by John Wiley and Sons, Inc., 1966, Chapter 8-4.
United States Patent Application Ser. No. 412,902, entitled "Television Sound Detection System Using a Frequency Translation Phase-Locked Loop", filed Aug. 30, 1982, in the name of Abraham E. Rindal and assigned to RCA Corporation.
Concurrently filed United States Patent Application entitled "Sound Signal and Impulse Noise Detector for Television Receivers", filed in the name of Abraham E. Rindal and assigned to RCA Corporation.
Block Diagram of 1450 Television Demodulator, manufactured by Tektronix, Inc., and published Jul. 1979.
Electrical Patents Index Profile Booklet, W3, Week E25/E28, published Sep. 15, 1982, includes on p. 40 a Figure and Abstract for Great Britain Patent Application No. 2,089,608, published Jun. 23, 1982.

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