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Perceptual weighting device and method for efficient coding of wideband signals

  • US 20050108007A1
  • Filed: 10/18/2004
  • Published: 05/19/2005
  • Est. Priority Date: 10/27/1998
  • Status: Abandoned Application
First Claim
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1. A perceptual weighting device for producing a perceptually weighted signal in response to a wideband signal in order to reduce a difference between a weighted wideband signal and a subsequently synthesized weighted wideband signal, said perceptual weighting device comprising:

  • a) a signal preemphasis filter responsive to the wideband signal for enhancing a high frequency content of the wideband 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 signal in a formant region is substantially decoupled from a spectral tilt of said wideband signal.

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