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Quality assessment apparatus and method

  • US 20050015245A1
  • Filed: 06/22/2004
  • Published: 01/20/2005
  • Est. Priority Date: 06/25/2003
  • Status: Active Grant
First Claim
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1. An apparatus for assessing the perceptual quality of speech signals transmitted via a telecommunications network and recorded acoustically from an acoustic terminal device comprising:

  • a front end processor for aligning a mono reference signal comprising a single channel with a degraded stereo signal comprising a first channel and a second channel, said front end processor comprising a leveller for adjusting the power levels of said signals and a time aligner for determining the estimated delays for each of said channels of said degraded signal;

    an auditory transformer for generating a set of perceptually relevant parameters for each of said signals; and

    a comparator for comparing said perceptually relevant parameters to generate disturbance profiles; and

    a modeller for generating a speech quality prediction in dependence upon said disturbance profiles;

    in which said front end processor further comprises a noise masking determiner for comparing signal parameters of each of said channels of said degraded signal and generating a noise masking indicator in dependence upon said parameters; and

    in which said disturbance profiles are dependent upon said noise masking indicator.

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