Television – Special applications – Manufacturing
Patent
1996-10-29
2000-02-01
Faile, Andrew I.
Television
Special applications
Manufacturing
455 31, 455 61, 455339, 327557, 333 171, H04N 710, H04H 100, H04H 102
Patent
active
060209119
ABSTRACT:
A filter for treating a plurality of channels in a television signal cable distribution system comprises a plurality of paralel bandpass filters having a frequency which is individually controlled by frequency control voltages. A master filter provided with a filtering cell of a type identical to that used in a bandpass filter corresponds to each bandpass filter. For adjusting the central frequency of a master filter, a frequency is applied thereto by a frequency synthesizer and the cell is aligned with this frequency by acting on its frequency control voltage. This voltage is simultaneously applied to a bandpass filter for controlling the frequency, which is thus aligned with the frequency of the synthesizer simultaneously with that of the corresponding master filter. Each couple consisting of a bandpass filter and a corresponding master filter is realized by means of integration on the same semiconductor substrate (IC).
REFERENCES:
patent: 4980882 (1990-12-01), Baer et al.
patent: 5300838 (1994-04-01), Elizondo
patent: 5317461 (1994-05-01), Okamoto et al.
patent: 5550520 (1996-08-01), Kobayashi
patent: 5561394 (1996-10-01), Hagino
Chanteau Pierre
Deville Yannick
Friedel Paul
Eason Lerov
Faile Andrew I.
Srivastava Vivek
U.S. Philips Corporation
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