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Method of calculating line spectral frequencies

  • US 6,760,740 B2
  • Filed: 07/02/2001
  • Issued: 07/06/2004
  • Est. Priority Date: 07/05/2000
  • Status: Expired due to Fees
First Claim
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1. A method of encoding a source signal by determining line spectral frequencies for representing linear predictive coding filter coefficients, said method comprising determining real zeros in associated polynomials in cos(mω

  • ), where m is an integer and ω

    is a variable angle, each of said associated polynomials comprising a series of Chebyshev polynomials, wherein a search for the real zeroes is performed by evaluating the associated polynomials in a series of steps in value of a variable, values of cos(ω

    ) being determined from an approximation of cos(ω

    ) as a function of a real variable u.

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