Audio level equalization of television sound, broadcast FM and N

Details Audio level equalization of television sound, broadcast FM and N Audio level equalization of television sound, broadcast FM and N

1991-05-06

1992-11-17

Kostak, Victor R.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358189, 3581931, 358198, 358197, 4551801, H04N 550

Patent

active

051648300

ABSTRACT:
A television receiver includes a single tuner for tuning both television channels and broadcast FM stations. The tuner serves as the first conversion stage of a double conversion FM receiver, a separate mixer-oscillator converts the FM radio sound IF to 4.5 MHz for processing in the television receiver's sound channel. A single discriminator circuit is employed for tuning FM radio signals having a first deviation, such as broadcast FM radio signals, and FM signals having a second deviation (i.e., the television sound signals), and FM radio signals having a third deviation, such as signals of the National Weather Service. Circuitry for amplifying the output signal of the discriminator circuit exhibits a first gain, and a first volume control range when amplifying FM signals having the first deviation, exhibits a second gain and the first volume control range, when amplifying FM signals having the second deviation, and exhibits a second gain, and a second volume control range when amplifying FM signals having the third deviation.

REFERENCES:
patent: 3970773 (1976-07-01), Muterspaugh
patent: 4272788 (1981-06-01), Ogita
patent: 4599652 (1986-07-01), Carlson
patent: 4633316 (1986-12-01), Burke
patent: 4698670 (1987-10-01), Matty
patent: 4907082 (1990-03-01), Richards
P. 2-1 of RCA/GE Color Television Service Data CTC156/157.
P. 2-3 of RCA/GE Color Television Supplemental Service Data CTC156/157-S1.

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