Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1979-09-27
1981-02-24
Griffin, Robert L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
333194, H04N 548
Patent
active
042531195
ABSTRACT:
A system is described for interfacing a SWIF with a tuner and an amplifier in the IF section of a television receiver. In the preferred arrangement, the tuner is coupled to the input of the SWIF so as to efficiently transfer signal power to the SWIF over the frequency range of the tuner's output. The output of the SWIF is coupled to an amplifier which has a low, untuned input impedance to establish a mismatch between the SWIF and the amplifier to therey reduce triple-transit effects associated with the SWIF. Preferably, the amplifier is a common-base amplifier whose input impedance is defined by a real impedance component which is substantially smaller in magnitude than its reactive impedance component. Hence, the real component of the amplifier's input impedance is dominant and the effects of stray capacitance between the SWIF and the amplifier are reduced.
REFERENCES:
patent: 3626309 (1971-12-01), Knowles
patent: 3714594 (1973-01-01), Adler
patent: 3737785 (1973-06-01), Korpel
patent: 4060833 (1977-11-01), Onyshkevych
patent: 4063202 (1977-12-01), Vasile
patent: 4065789 (1977-12-01), DeVries
patent: 4126838 (1978-11-01), McCusker
Surface Accoustic-Wave Filter for Television Intermediate Freq., Van Raalte, RCA-Engineer-Jun.-Jul. 1974, vol. 70, No. 1, pp. 15-19.
Griffin Robert L.
Masinick Michael A.
Zenith Radio Corporation
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