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Mobile radio wave receiver with adaptive automatic gain control

  • US 6,070,062 A
  • Filed: 03/27/1998
  • Issued: 05/30/2000
  • Est. Priority Date: 03/28/1997
  • Status: Expired due to Fees
First Claim
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1. A mobile radio wave receiver comprising:

  • an antenna for receiving a radio wave signal including a desired component which includes data and error correction code data;

    automatic-gain-controlled-amplifying means for amplifying the received radio wave signal with a gain controlled in accordance with a gain control signal;

    intermediate frequency signal generation means generating an intermediate frequency signal from an output of said automatic-gain-controlled-amplifying means;

    demodulation means for demodulating said intermediate frequency signal and detecting said data and said error correction code data to output the detected data and the detected error correction code data including;

    bandpass filter means for bandpass-filtering said intermediate frequency signal with a first variable bandwidth to detect said desired component;

    demodulation signal generation means for generating a demodulation signal from the detected desired component; and

    waveform shaping filter means with a second variable bandwidth for waveform-shaping said demodulation signal to output the detected data and the detected error correction code data;

    electric field intensity detection means responsive to said intermediate frequency signal generation means detecting an electric field intensity of said radio wave signal;

    comparing means for comparing said detected electric field intensity with a reference;

    control means responsive to said comparing means and said electric field Intensity detection means for generating said gain control signal in accordance with said detected electric field intensity when the detected electric field intensity is not lower than a reference and holding said gain control signal when the detected electric field intensity is lower than said reference andbandwidth control means for making said first and second variable bandwidths in a narrow bandwidth condition when the detected electric field intensity is lower than said reference and making said first and second bandwidths in a wide bandwidth condition when the detected electric field intensity is not lower than said reference.

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