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Intelligent teletext decoder

  • US 4,449,145 A
  • Filed: 06/13/1983
  • Issued: 05/15/1984
  • Est. Priority Date: 01/24/1980
  • Status: Expired due to Term
First Claim
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1. A machine implemented method for use with a receiver which receives both transmitted digital format data signals and a transmitted reference signal, for equalizing said digital format data signals according to distortion exhibited by said reference signal and decoding said digital format data signals, comprising the steps of:

  • loading said reference signal into a time base expander having an input and an output in real time;

    thenapplying the reference signal from the output of said time base expander at a selectable rate to another circuit and therein automatically and electronically calculating adjustment signals based on said reference signal for correcting said reference signal;

    adjusting a filter having tap weights in accordance with an adjustment signal to obtain weighted taps;

    loading said digital format data signals into said filter;

    equalizing said digital format data signals in said filter, including generating weighted signals in accordance with the weighted taps and said digital format data signals in said filter thereby to obtain an equalized data signal; and

    thendecoding said equalized data signal.

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