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Adaptive Weiner filtering using line spectral frequencies

  • US RE43,191 E1
  • Filed: 08/24/2004
  • Issued: 02/14/2012
  • Est. Priority Date: 04/19/1995
  • Status: Expired due to Term
First Claim
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1. A method of filtering a stream of sampled acoustic signals, comprising the steps of:

  • (a) partitioning a the stream of sampled acoustic signals into a sequence of frames;

    (b) Fourier transforming said flames the frames using processing circuitry to yield a sequence of transformed frames;

    (c) applying a generalized Wiener filter to said the transformed frames to yield a sequence of filtered transformed frames, wherein said the filter uses power spectrum estimates from LSFs line spectral frequencies (LSFs) defined as weighted sums of LSFs of a codebook of LSFs with the weights determined by the LSFs of said the transformed frames; and

    (d) inverse Fourier transforming said sequence of filtered transformed frames to yield a sequence of filtered frames.

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