Television – Television transmitter circuitry
Reexamination Certificate
2005-11-22
2005-11-22
Miller, John (Department: 2614)
Television
Television transmitter circuitry
C348S731000, C348S732000, C348S733000
Reexamination Certificate
active
06967693
ABSTRACT:
A television signal transmitter includes a mixer in which an intermediate-frequency television signal is frequency-converted into a television signal on a channel used for transmission in a predetermined frequency range, a bandpass filter to which the television signal on the channel used for transmission is input and the passband center frequency of which is changed by an applied control voltage, a memory which stores, in the form of digital data, voltages for setting the passband center frequency to equal the frequencies of a plurality of channels in the frequency range, and a D/A converter which converts the digital data into each analog voltage. The analog voltage, at which the passband center frequency equals the frequency of the channel used for transmission, is applied as the control voltage to the bandpass filter.
REFERENCES:
patent: 5200826 (1993-04-01), Seong
patent: 5507025 (1996-04-01), Rodeffer
patent: 5956098 (1999-09-01), Mizukami et al.
patent: 5995169 (1999-11-01), Hatano
patent: 6768902 (2004-07-01), Kajita
patent: 2001/0040643 (2001-11-01), Kudo
patent: 07-038384 (1995-02-01), None
patent: 10-294929 (1998-11-01), None
Alps Electric Co. ,Ltd.
Brinks Hofer Gilson & Lione
Miller John
Tran Trang U.
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