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Interpolating between representative frame waveforms of a prediction error signal for speech synthesis

  • US 5,890,118 A
  • Filed: 03/08/1996
  • Issued: 03/30/1999
  • Est. Priority Date: 03/16/1995
  • Status: Expired due to Fees
First Claim
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1. A speech synthesis apparatus comprising:

  • a memory for storing a plurality of typical waveforms corresponding to a plurality of frames, the typical waveforms each previously obtained by extracting in units of at least one frame from a prediction error signal formed in predetermined units;

    a voiced speech source generator including an interpolation circuit for performing interpolation between the typical waveforms readout from said memory to obtain a plurality of interpolation signals each having at least one of an interpolation pitch period and a signal level which changes smoothly between the corresponding frames, and a superposing circuit for superposing the interpolation signals obtained by said interpolation circuit to form a voiced speech source signal;

    an unvoiced speech source generator for generating an unvoiced speech source signal; and

    vocal tract filter selectively driven by the voiced speech source signal outputted from said voiced speech source generator and the unvoiced speech source signal from said unvoiced speech source generator to generate synthetic speech.

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