Patent ID: 6775336
Filing Date: 2004-08-10
Classification: H03G,H03M

Abstract:
A receiver comprising:selecting means for selectively deriving and outputting a desired wave in a received wave; gain control amplifying means for amplifying the output from said selecting means; demodulating means for demodulating the amplified output; digital signal processing means for digitally processing a baseband signal which is the demodulated output from said demodulating means, said digital signal processing means including a digital converter for digitizing said baseband signal and a filter for filtering out an interference wave component from the digital signal; and gain control means for comparing a power amount corresponding to the demodulated output with a selected one of a plurality of target values to control gain of said gain control amplifying means in accordance with the comparison result, said gain control means including target value switching control means for switching said selected one of said plurality of target values to another target value in accordance with the presence or absence of an interference wave contained in said demodulated output, and said target value switching control means including interference wave detecting means for detecting the presence or absence of said interference wave based on an output power amount from said filter and a saturated operation state of said digital converter and, wherein said interference wave detecting means detects said saturated operation state when said digital converter provides a continuous maximum output.