Perceptual weighting device and method for efficient coding of wideband signals

  • US 6,807,524 B1
  • Filed: 06/20/2001
  • Issued: 10/19/2004
  • Est. Priority Date: 10/27/1998
  • Status: Expired due to Term
First Claim
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1. A perceptual weighting device for producing a perceptually weighted signal in response to a wideband speech signal in order to reduce a difference between the wideband speech signal and a subsequently synthesized wideband speech signal, said perceptual weighting device comprising:

  • a) a signal preemphasis filter responsive to the wideband speech signal for enhancing a high frequency content of the wideband speech signal to thereby produce a preemphasised signal;

    b) a synthesis filter calculator responsive to said preemphasised signal for producing synthesis filter coefficients; and

    c) a perceptual weighting filter, responsive to said preemphasised signal and said synthesis filter coefficients, for filtering said preemphasised signal in relation to said synthesis filter coefficients to thereby produce said perceptually weighted signal, said perceptual weighting filter having a transfer function with fixed denominator whereby weighting of said wideband speech signal in a formant region is substantially decoupled from a spectral tilt of said wideband speech signal.

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