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Enabling sampling rate diversity in a voice communication system

  • US 9,905,236 B2
  • Filed: 03/21/2013
  • Issued: 02/27/2018
  • Est. Priority Date: 03/23/2012
  • Status: Active Grant
First Claim
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1. An audio communication endpoint (110, 120, 130) configured to process a received bitstream containing spectral components representing spectral content of an audio signal,wherein the spectral components relate to a first frequency range extending up to a first break frequency, above which any spectral components are unassigned,the audio communication endpoint including:

  • a decoder (202, 525) configured to reconstruct the audio signal by means of an inverse transform operating on spectral components relating to a second frequency range extending up to a second break frequency; and

    a pre-processor (201, 203, 204;

    522, 523, 526), which is operable to adapt the received bitstream in accordance with the second frequency range by removing spectral components or adding neutral-valued spectral components relating to a range between the first and second break frequencies, and is operable to attenuate in the frequency domain, in connection herewith, spectral content in a neighbourhood of a cut-off frequency being the least of the first and the second break frequencies, for thereby achieving a gradual spectral decay,wherein the pre-processor is further configured to characterize the spectral decay of the adapted received bitstream and to base a decision whether to attenuate spectral content at the cut-off frequency on this characterization.

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