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TIME WARP ACTIVATION SIGNAL PROVIDER, AUDIO SIGNAL ENCODER, METHOD FOR PROVIDING A TIME WARP ACTIVATION SIGNAL, METHOD FOR ENCODING AN AUDIO SIGNAL AND COMPUTER PROGRAMS

  • US 20150066491A1
  • Filed: 11/11/2014
  • Published: 03/05/2015
  • Est. Priority Date: 07/11/2008
  • Status: Active Grant
First Claim
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1. Audio encoder for generating an encoded audio signal, comprising:

  • an audio signal analyzer for analyzing, whether a time frame of the audio signal comprises a harmonic or speech characteristic;

    a window function controller for selecting a window function depending on a harmonic or speech characteristic of the audio signal;

    a windower for windowing the audio signal using the selected window function to acquire a windowed frame; and

    a processor for further processing the windowed frame to acquire the encoded audio signal, anda transient detector;

    wherein the transient detector is configured for detecting a quantitative characteristic of the audio signal and to compare the quantitative characteristic to a controllable threshold, wherein a transient is detected, when the quantitative characteristic comprises a predetermined relation to the controllable threshold, andwherein the audio signal analyzer is configured for controlling the variable threshold so that a likelihood for a switch to a window function for a short block is reduced, when the audio signal analyzer has found a harmonic or speech characteristic.

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