AM receiving circuit

Details AM receiving circuit AM receiving circuit

2005-02-23

2010-02-16

Corrielus, Jean B (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Amplitude modulation

C375S285000, C375S316000, C375S320000, C375S350000, C381S094100, C455S226400, C455S312000

Reexamination Certificate

active

07664197

ABSTRACT:
An AM receiving circuit is disclosed which comprises an intermediate frequency amplifying unit that generates an intermediate frequency signal from a broadcast wave signal received by an antenna to amplify and output the intermediate frequency signal; an AGC (Automatic Gain Control) unit that sets gain of the intermediate frequency amplifying unit depending on electric field intensity of the broadcast wave signal; and an AM detecting unit that detects the intermediate frequency signal output from the intermediate frequency amplifying unit, wherein the AM receiving circuit comprises a sound quality compensating unit including: a filter unit that extracts a predetermined frequency band of the audio signal; an amplifying unit that boosts or attenuates the audio signal in the predetermined frequency band extracted from the filter unit; and a controlling unit that controls filter characteristics of the filter unit and sets a boosting function or an attenuating function of the amplifying unit, depending on the electric field intensity of the broadcast wave signal.

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Chinese Patent Office, Office Action for Application No. 2005800102593, Mail date: Nov. 28, 2008.
Japanese Patent Office, Office Action for Application No. 2004-099360, Mail date: Sep. 9, 2008.

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