Electric wave receiving apparatus

Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency

Reexamination Certificate

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Details

C455S234200, C455S132000, C455S272000, C455S063100, C375S140000, C375S146000

Reexamination Certificate

active

08068801

ABSTRACT:
An electric wave receiving apparatus comprises: an antenna; an amplifier; filter circuits that extract signals in different frequency bands from an output of the amplifier; detector circuits that demodulate time codes from outputs of the filter circuits; automatic gain control circuits that generate gain control signals from the detector circuits; a selector that selects one gain control signal indicating a maximum signal level among the gain control signals; and an arithmetic processing section to be able to analyze the time codes of outputs of the plurality of detector circuits, wherein the one gain control signal is supplied to the amplifier to control an amplification factor of the amplifier so that signal levels output from detector circuits do not become excessive, and the arithmetic processing section selects an output to enable the analysis of the time code among the outputs of detector circuits to perform the analysis of the time code.

REFERENCES:
patent: 6728298 (2004-04-01), Okubo et al.
patent: 2005/0147080 (2005-07-01), Haefner et al.
patent: 2005/0175039 (2005-08-01), Haefner et al.
patent: 1684010 (2005-10-01), None
patent: 04-341027 (1992-11-01), None
patent: 05-121947 (1993-05-01), None
patent: 11-346169 (1999-12-01), None
patent: 2005-005847 (2005-01-01), None
patent: 2005-079981 (2005-03-01), None
Japanese Office Action dated Jun. 28, 2011 and English translation thereof in counterpart Japanese Application No. 2007-188317.
Chinese Office Action dated May 25, 2011 (and English translation thereof) in counterpart Chinese Application No. 200810133339.3.

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