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Compression of stored waveforms for artificial speech

  • US 4,852,168 A
  • Filed: 11/18/1986
  • Issued: 07/25/1989
  • Est. Priority Date: 11/18/1986
  • Status: Expired due to Fees
First Claim
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1. In a method of digitally converting text to speech, said method including the step of encoding waveforms representing sounds in the form of digital indices representing addresses in a table containing selected values of Δ

  • , and the successive samples of the waveform are computed by the formula
    
    
    space="preserve" listing-type="equation">S.sub.t =aS.sub.t-1 +bS.sub.t-2 +Δ

    where St is the sample being computed, St-1 is the next preceding sample, St-2 is the second preceding sample, a and b are constants, and Δ

    is the value stored in said table at the address defined by the index corresponding to St, the improvement comprising encoding said indices by a Huffman coding in which the shortest codes of said Huffman coding represent the addresses of the Δ

    values occurring most frequently in the computation of said waveform.

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