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Apparatus and a Method for Generating Bandwidth Extension Output Data

  • US 20110202352A1
  • Filed: 01/11/2011
  • Published: 08/18/2011
  • Est. Priority Date: 07/11/2008
  • Status: Active Grant
First Claim
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1. An encoder for encoding an audio signal, the audio signal comprising components in a first frequency band and components in a second frequency band, the encoder comprising:

  • a core coder for encoding the components in the first frequency band to acquire an encoded audio signal;

    an envelope data calculator for calculating bandwidth extension (BWE) data based on the components in the second frequency band, the envelope data calculator comprising an apparatus for generating bandwidth extension output data for the audio signal, the bandwidth extension output data being adapted to control a synthesis of the components in the second frequency band, the apparatus comprising;

    a noise floor measurer for measuring noise floor data of the second frequency band for a time portion of the audio signal;

    a signal energy characterizer for deriving energy distribution data, the energy distribution data characterizing an energy distribution in a spectrum of the time portion of the audio signal; and

    a processor for combining the noise floor data and the energy distribution data to acquire the bandwidth extension output data,wherein the bandwidth extension data comprise the bandwidth extension data and envelope data; and

    a bitstream payload formatter adapted for outputting a coded audio stream by combining the bandwidth extension data with the encoded audio signal, wherein the processor is part of the bitstream payload formatter.

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