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Speech synthesizing method and apparatus therefor

  • US 5,495,556 A
  • Filed: 01/14/1994
  • Issued: 02/27/1996
  • Est. Priority Date: 10/02/1989
  • Status: Expired due to Fees
First Claim
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1. A speech synthesizing apparatus for receiving parameters representing a speech waveform including parameters representing an excitation signal and synthesizing a speech in accordance with the received parameters, said parameters representing the excitation signal including parameters that represent impulse positions of a sequence of impulses in a phase-equalized residual of the speech waveform and parameters that represent zero-filter coefficients, said apparatus comprising:

  • impulse sequence generating means for generating a sequence of impulses at impulse positions respectively designated by said parameters representing said impulse positions;

    zero filter means having an impulse response which assumes values at each impulse position and at a predetermined number of successive sample points on either side of said each impulse position and further at a midpoint between adjacent impulse positions and at a predetermined number of successive sample points on either side of said midpoint, said zero filter means being supplied with said sequence of impulses from said impulse sequence generating means and excited under control of zero filter coefficients supplied thereto as one of said parameters representing said excitation signal for providing said sequence of impulses with a shape resembling a phase-equalized residual of the speech; and

    all-pole filter means excited by the output of said zero filter means under control of prediction coefficients supplied thereto as another one of the parameters representing said speech waveform, said prediction coefficients representing a speech spectral envelope characteristic.

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