Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Reexamination Certificate
2005-11-10
2008-10-21
Urban, Edward (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
C455S188100, C348S731000
Reexamination Certificate
active
07440736
ABSTRACT:
An intermediate frequency circuit includes an intermediate frequency tuning circuit which resonates parallel to an intermediate frequency signal, a N−1 channel trap circuit connected to the output of the intermediate frequency tuning circuit, for removing voice signal components of lower neighboring channels, an intermediate frequency amplifier connected to the output of the N−1 channel trap circuit, for amplifying the intermediate frequency signal, and an intermediate frequency signal resonance circuit connected to the output of the intermediate frequency amplifier, wherein all the components are formed on a circuit board. In this case, the coupling state of the components connected between the input and output of the intermediate frequency amplifier on the circuit board is selected, and a picture portion in a frequency characteristic of the intermediate frequency circuit is set to a peak.
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Search Report dated Nov. 22, 2006, for corresponding European Patent Application No. 05 024 206.4.
Search Report dated Mar. 10, 2006 for corresponding European Application No. 05 024 206.4.
Alps Electric Co. ,Ltd.
Brinks Hofer Gilson & Lione
Haroon Adeel
Urban Edward
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