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APPARATUS AND METHOD FOR DECODING OR ENCODING AN AUDIO SIGNAL USING ENERGY INFORMATION VALUES FOR A RECONSTRUCTION BAND

  • US 20180144760A1
  • Filed: 01/18/2018
  • Published: 05/24/2018
  • Est. Priority Date: 07/22/2013
  • Status: Active Grant
First Claim
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1. An audio encoder for generating an encoded audio signal, comprising:

  • a time-spectrum converter configured for converting an audio signal into a spectral representation;

    a spectral analyzer configured for analyzing the spectral representation of the audio signal in order to determine a first set of first spectral portions to be encoded with a first spectral resolution and a second set of second spectral portions to be encoded with a second spectral resolution, the second spectral resolution being lower than the first spectral resolution;

    a parameter calculator configured for providing an energy information for a reconstruction band comprising spectral values of a first spectral portion and comprising a second spectral portion; and

    an audio encoder configured for generating a first encoded representation of the first set of the first spectral portions comprising the first spectral resolution, wherein the audio encoder is configured for providing scale factors for scale factor bands, wherein the first encoded representation comprises the scale factors; and

    wherein the parameter calculator is configured for generating a second encoded representation of the second set of second spectral portions, the second encoded representation comprising the energy information for the reconstruction band, wherein the reconstruction band coincides with a scale factor band or a group of scale factor bands, and wherein the first encoded representation comprises a scale factor for the scale factor band comprised in the reconstruction band.

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