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Radio signal reception with a PLL frequency controlled for an IF signal depending on coexistence of a spurious signal with the radio signal

  • US 5,564,099 A
  • Filed: 06/06/1994
  • Issued: 10/08/1996
  • Est. Priority Date: 06/08/1993
  • Status: Expired due to Fees
First Claim
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1. A radio signal receiving method of receiving a radio signal, comprising the steps of generating a phase locked oscillation signal of a generated frequency, frequency multiplying said phase locked oscillation signal into a local oscillation signal with said generated frequency multiplied into a local oscillation frequency with a multiplication factor, mixing said radio signal end said local oscillation signal into an intermediate frequency signal, and receiving said intermediate frequency signal to produce an information signal carried by said radio signal, wherein:

  • said generating step is a controllable generating step of generating said phase locked oscillation signal with a controllable frequency;

    said frequency multiplying step is a controllable frequency multiplying step of multiplying said controllable frequency into said local oscillation frequency with a controllable factor used as said multiplication factor;

    said receiving step comprising the steps of;

    detecting, responsive to said intermediate frequency signal, whether or not a spurious signal coexists with said radio signal; and

    controlling said controllable generating step and said controllable frequency multiplying step to raise said controllable frequency and to reduce said controllable factor when coexistence of said spurious signal is detected.

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