IF circuit with reduced sound attenuation for cable signals

Details IF circuit with reduced sound attenuation for cable signals IF circuit with reduced sound attenuation for cable signals

1987-05-06

1988-08-23

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 86, 358196, 455 3, H04N 562, H04N 710

Patent

active

047664975

ABSTRACT:
A cable-ready television receiver including a tuner switchable between cable and off-air signals has an LC trap tuned to the audio carrier frequency coupled between the tuner and a SAW IF amplifier. The trap includes a varactor diode that, when it exhibits a large capacitance, effectively disables the trap. This occurs when the receiver is used with cable signals. In the event the receiver is used for off-air signals, the voltage applied to the varactor diode causes it to exhibit a much smaller capacitance which effectively enables the trap.

REFERENCES:
patent: 4109280 (1978-08-01), Dash
patent: 4312016 (1982-01-01), Glaab
patent: 4348691 (1982-09-01), Mistry
patent: 4499495 (1985-02-01), Strammello
patent: 4633316 (1986-12-01), Burke

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