Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Reexamination Certificate
2002-12-09
2010-06-15
Nguyen, Tuan H (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
C455S232100, C455S240100, C455S250100, C375S345000, C375S350000
Reexamination Certificate
active
07738847
ABSTRACT:
The circuit arrangement comprises a tuner with a control amplifier and a mixer connected downstream, and an automatic gain control. The automatic gain control contains a weighting filter, which is connected to the output of the mixer, upstream of an intermediate frequency filter, and which supplies the control signal for the control amplifier of the tuner via a detector. The weighting filter has, in particular, a passband, which corresponds to the passband of the intermediate frequency filter and at least partly encompasses at least one or two adjacent program channels. As a result of this, the control amplifier is better tuned under difficult reception conditions, since, by means of the weighting filter, adjacent channels, relative to the passband of the intermediate frequency filter, are also concomitantly included in the control signal.
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patent: 5630220 (1997-05-01), Yano
patent: 6385262 (2002-05-01), Gustafsson et al.
patent: 6683919 (2004-01-01), Olgaard et al.
patent: 602370 (1994-06-01), None
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Searcha Report Dated Mar. 24, 2003.
Armbruster Veit
Stalf Stefan
Cromarty Brian J.
Nguyen Tuan H
Opalach Joseph J.
Shedd Robert D.
Thomson Licensing
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