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Process for transmitting and receiving a signal

  • US 5,227,990 A
  • Filed: 01/17/1992
  • Issued: 07/13/1993
  • Est. Priority Date: 05/17/1989
  • Status: Expired due to Term
First Claim
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1. A communication method for use in a communications system having a transmitter and receiver, comprising:

  • dividing a signal using windows into successive blocks that overlap by at least 50%, signal sections contained in the blocks being evaluated with analysis windows;

    subjecting the signal sections contained in the blocks to a transformation which permits sub-sampling with compensation of aliasing components, said transformation performing time domain aliasing cancellation;

    wherein spectra resulting from the transformation are subsequently transmitted from the transmitter to a receiver and are changed back to blocks having signal sections by retransformation;

    wherein the retransformed blocks having the signal sections are evaluated with synthesis windows and are joined together in an overlapping fashion; and

    wherein window functions of the synthesis windows are determined in dependence on window functions of corresponding analysis windows in the overlap region, according to the following equations;

    ##EQU5## where an (t) is the analysis window function for block n;

    sn (t) is the synthesis window function for block n;

    an+1 (t) is the analysis window function for block n+1;

    sn+1 (t) is the synthesis window function for block n+1; and

    TB is the block time.

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