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Narrow bandwidth signal transmission

  • US 4,665,436 A
  • Filed: 12/20/1985
  • Issued: 05/12/1987
  • Est. Priority Date: 12/20/1985
  • Status: Expired due to Fees
First Claim
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1. A narrow bandwidth signal transmission system, comprising:

  • digitizing means providing quantized raw data samples of the signal to be transmitted;

    means for filtering and sampling the raw data samples, providing a statistically smoothed image subset having information representative of the full set of raw data, but fewer data points;

    a transform coder for determining the energy of the subset;

    means for encoding the transformed image of the subset;

    a predictor operable to predict likely raw data values at and between the filtered, sample values to produce a recovered set of data values, the predictor corresponding to a further predictor in a signal reception system;

    means for producing a difference signal by subtracting the raw data from the predicted valves;

    means for encoding the difference signal; and

    ,means for transmitting the encoded transformed image and the encoded difference signal.

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