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Perceptual coding of audio signals

  • US 5,040,217 A
  • Filed: 10/18/1989
  • Issued: 08/13/1991
  • Est. Priority Date: 10/18/1989
  • Status: Expired
First Claim
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1. A method of processing an ordered time sequence of audio signals partitioned into contiguous blocks of samples, each such block having a discrete short-time spectrum, S(ω

  • i), i=1, 2, . . . N, for each of said blocks, comprisingpredicting, for each block, an estimate of the values for each S(ω

    i) based on the values for S(ω

    i) for one or more prior blocks,determining for each frequency, ω

    i, a randomness metric based on the predicted value for each S(ω

    i) and the actual value for S(ω

    i) for each block,based on said randomness metrics, and the distribution of power with frequency in the block, determining the value of a tonality function as a function of frequency, andbased on said tonality function, estimating the noise masking threshold at each ω

    i.

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