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Noise filling concept

  • US 10,410,642 B2
  • Filed: 09/07/2017
  • Issued: 09/10/2019
  • Est. Priority Date: 01/29/2013
  • Status: Active Grant
First Claim
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1. An apparatus configured to perform a method, comprising:

  • performing noise filling on a spectrum of an audio signal in a manner dependent on a tonality of the audio signal by filling a contiguous spectral zero-portion of the audio signal'"'"'s spectrum with noise spectrally shaped by one of;

    using a function assuming a maximum in an inner of the contiguous spectral zero-portion, and comprising outwardly falling edges and setting an absolute slope of the function'"'"'s outwardly falling edges negatively depending on the tonality,using a function assuming a maximum in an inner of the contiguous spectral zero-portion, and comprising outwardly falling edges and setting a spectral width of the function positively depending on the tonality, andusing a unimodal function having a local maximum surrounded by two outwardly falling flanks and adjusting the unimodal function depending on the tonality such that an integral of the unimodal function, normalized to an integral of 1, over outer quarters of the contiguous spectral zero-portion negatively depends on the tonality; and

    dequantizing the spectrum, as derived by the noise-filling, usinga spectrally varying and signal-adaptive quantization step size controlled via a linear prediction spectral envelope signaled via linear prediction coefficients in a data stream into which the spectrum is coded, orscale factors relating to scale factor bands, signaled in the data stream into which the spectrum is coded;

    wherein the apparatus comprises any of a microprocessor, an electronic circuit, or a programmable computer.

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