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Transmitter/receiver system

  • US 4,660,215 A
  • Filed: 12/04/1984
  • Issued: 04/21/1987
  • Est. Priority Date: 12/07/1983
  • Status: Expired due to Fees
First Claim
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1. A transmitter/receiver system comprising:

  • a transmitter which transmits a multi-frequency signal composed of a reference frequency signal having a reference frequency followed by at least an information signal having a frequency different from said reference frequency; and

    a receiver which receives said multi-frequency signal and produces an information corresponding to a frequency difference between said information signal and said reference signal,said receiver comprising;

    a frequency conversion means having a local oscillator for converting frequencies of said multi-frequency signal to lower frequencies;

    a frequency analyzing means for analyzing the lower-converted frequencies of said multi-frequency signal, which comprises a plurality of filters divided into groups each composed of at least three filters, each group being assigned to each of the lower-converted frequencies of said multi-frequency signal;

    a decoding means for decoding the analyzed frequencies to produce said information corresponding to said frequency difference, said decoding means controlling a local oscillation frequency of said local oscillator so that a lower-converted frequency signal corresponding to said reference frequency signal is outputted from a filter in a group assigned to said reference frequency signal in said frequency analyzing means; and

    a means for changing the grouping of said plurality of filters in said frequency analyzing means so that said lower-converted frequency signal corresponding to said reference frequency signal is outputted from a center filter among said at least three filters in said group assigned to said reference frequency signal.

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