Television signal transmitter attenuating unwanted signal...

Details Television signal transmitter attenuating unwanted signal... Television signal transmitter attenuating unwanted signal...

2006-02-28

2006-02-28

Lee, Michael H. (Department: 2614)

Television

Television transmitter circuitry

C348S724000, C348S731000

Reexamination Certificate

active

07006160

ABSTRACT:
A signal transmitter prevented from outputting an unwanted signal to the outside, which is generated at the time of changing any of various setting parameters such as a channel through which a signal is to be transmitted and the degree of modulation of an intermediate frequency signal to be supplied without deteriorating impedance matching between circuits. This signal transmitter has a local oscillator for outputting a local oscillation signal; a mixer for mixing a supplied television intermediate frequency signal with the local oscillation signal and frequency-converting the resultant signal to a television signal of a specific channel through which the signal is to be transmitted among television channels; and a variable band-pass filter connected at a post stage of the mixer and tuned to the frequency of the specific channel. The tuning frequency of the variable band-pass filter can be shifted out of the frequency band of the specific channel.

REFERENCES:
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patent: 4564858 (1986-01-01), Resch
patent: 5051711 (1991-09-01), Jones
patent: 5507025 (1996-04-01), Rodeffer
patent: 5525906 (1996-06-01), Crawford et al.
patent: 5528633 (1996-06-01), Halik et al.
patent: 5963842 (1999-10-01), Kinugawa
patent: 5995169 (1999-11-01), Hatano
patent: 6418162 (2002-07-01), Yau et al.
patent: 6573949 (2003-06-01), Yamamoto
patent: HEI 7-38384 (1995-02-01), None

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