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SPATIALLY ROBUST AUDIO PRECOMPENSATION

  • US 20090238380A1
  • Filed: 03/20/2008
  • Published: 09/24/2009
  • Est. Priority Date: 03/20/2008
  • Status: Active Grant
First Claim
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1. A method for designing a discrete-time audio precompensation filter based on a Single-Input Multiple Output linear model (H) that describes the dynamic response of an associated sound generating system at p>

  • 1 listening positions, for which said dynamic response differs for at least two of these listening positions, said method comprising the steps of;

    providing information representative of n non-minimum phase zeros {zi} that are outside of the stability region |z|=1 in the complex frequency domain, where 1≦

    n<

    m, with m being the smallest number of zeros outside |z|=1 of any of the p individual scalar models from the single input to the p outputs of the linear model H, said non-minimum phase zeros having the property that their inversion by the precompensation filter results in pre-ringings of the compensated impulse response that are smaller than a prespecified limit;

    determining said precompensation filter as the product of at least two scalar dynamic systems, represented by;

    i) an inverse of a characteristic scalar magnitude response in the frequency domain that represents the power gains at all or a subset of the p listening positions according to the model H;

    ii) a causal Finite Impulse Response (FIR) filter of user-specified degree d, wherein said FIR filter has coefficients corresponding to a causal part of a delayed non-causal impulse response that is based on said information representative of n non-minimum phase zeros.

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