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Filter for speech modification or enhancement, and various apparatus, systems and method using same

  • US 5,822,732 A
  • Filed: 05/02/1996
  • Issued: 10/13/1998
  • Est. Priority Date: 05/12/1995
  • Status: Expired due to Fees
First Claim
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1. A filter comprising:

  • filtering means for filtering synthesized speech signals through a transfer function defined by filter coefficients to generate modified synthesized speech signals; and

    filter coefficient generation means for generating said filter coefficients on the basis of spectral information represented in the form of a multi-dimensional vector and belonging to a predetermined domain and pertaining to input speech signals, in such a manner that formant characteristics of said modified synthesized speech signals are enhanced in accordance with said spectral information and in comparison with formant characteristics of said synthesized speech signals;

    said spectral information being any one of line spectrum pairs (LSP) information, partial autocorrelation coefficients (PARCOR) information and log area ratio (LAR) information.

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