Double trapping of adjacent channel sound

Details Double trapping of adjacent channel sound Double trapping of adjacent channel sound

1979-04-20

1981-04-21

Safourek, Benedict V.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

333176, H04N 560

Patent

active

042636191

ABSTRACT:
A network is provided for attenuating the adjacent channel sound carrier signal in a television receiver. First and second trap circuits are serially coupled intermediate the R.F. mixer and the first I.F. amplifier. One of the trap circuits is tuned to a frequency in the vicinity of and above the nominal frequency of the adjacent channel sound carrier, and the other is tuned to a frequency in the vicinity of and below that of the adjacent channel sound carrier. The two trap circuits are mutually coupled to a degree necessary to produce a composite response curve exhibiting a substantially constant level of maximum attenuation in the vicinity of the nominal frequency location of the adjacent channel sound carrier. The trap circuits provide attenuation in excess of that required to eliminate adjacent channel sound carrier interference over a bandwidth sufficient to encompass expected carrier deviation due to frequency modulation, carrier mislocation, and trap mistuning.

REFERENCES:
patent: 2312145 (1943-02-01), Bradley
patent: 3074026 (1963-01-01), Kuzminsky
patent: 3204025 (1965-08-01), Przybyszewski
patent: 3217096 (1965-11-01), Caprio
patent: 3562417 (1971-02-01), Poppa
RCA Victor Service Data, 1954, No. T13, Model 21-CT-55, 11/24/54.
RCA Television Service Data File 1978 C-2 For CTC-87 Series Chassis, p. 28.
The Design of IF Amplifiers For Color Television Receivers, Jack Avins, IRE Trans on Broadcast and TV Receivers, pp. 14-25, vol. 1952-1955, No. PGBTR-7, Jul. 1954.

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