Television tuner input circuit having satisfactory selection...

Details Television tuner input circuit having satisfactory selection... Television tuner input circuit having satisfactory selection...

2005-03-08

2005-03-08

Lee, Michael H. (Department: 2614)

Television

Receiver circuitry

Tuning

C348S732000, C348S725000, C348S729000, C455S188100, C455S191300

Reexamination Certificate

active

06864924

ABSTRACT:
The present invention provides a television tuner input circuit having satisfactory selection properties free from influence by half of signal frequencies to be received. The television tuner input circuit of the present invention has a tuning circuit and a high pass filter cascaded to the tuning circuit, wherein: the tuning circuit is switched to a low band or high band television signal reception state; when the tuning circuit is switched to a low band reception state, a cutoff frequency of the high pass filter is set lower than the minimum frequency of the low band; and when the tuning circuit is switched to a high band reception state, a cutoff frequency is set lower than the minimum frequency of the high band and higher than half of the maximum frequency thereof.

REFERENCES:
patent: 4731877 (1988-03-01), Moon
patent: 4756024 (1988-07-01), Kupfer
patent: 5054117 (1991-10-01), Cruz et al.
patent: 2 136 230 (1984-09-01), None
patent: 08-097742 (1996-04-01), None

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