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Channel selecting method and highspeed scanning radio receiver which concurrently scans multiple channels

  • US 5,438,688 A
  • Filed: 12/06/1993
  • Issued: 08/01/1995
  • Est. Priority Date: 06/02/1993
  • Status: Expired due to Term
First Claim
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1. A channel-selecting method of a radio receiver for scanning a plurality of channels separated from each other by a predetermined frequency, comprising the steps of:

  • producing an oscillating frequency signal;

    scanning said plurality of channels by changing said oscillating frequency signal in frequency, in increments corresponding to a multiple of said predetermined frequency;

    mixing a received signal with said oscillating frequency signal during a searching operation of a certain channel, corresponding to the frequency of the oscillating frequency signal, to convert said received signal into an intermediate frequency signal;

    converting a change in frequency of said intermediate frequency signal into a change in a voltage signal;

    detecting whether or not a desired reception signal is present in multiple channels, including the certain channel, based on the change in said voltage signal; and

    stopping the scanning step upon detection of said desired reception signal, and determining at which channel of the multiple channels the scanning step is stopped responsive to said voltage signal.

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