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Concept for encoding an audio signal and decoding an audio signal using speech related spectral shaping information

  • US 10,373,625 B2
  • Filed: 04/18/2016
  • Issued: 08/06/2019
  • Est. Priority Date: 10/18/2013
  • Status: Active Grant
First Claim
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1. An encoder for encoding an audio signal, the encoder comprisingan analyzer configured for deriving prediction coefficients and a residual signal from a frame of the audio signal;

  • a formant information calculator configured for calculating a speech related spectral shaping information from the prediction coefficients;

    a gain parameter calculator configured for calculating a gain parameter from an unvoiced residual signal and the spectral shaping information; and

    a bitstream former configured for forming an output signal based on an information related to a voiced signal frame, the gain parameter or a quantized gain parameter and the prediction coefficients;

    wherein the gain parameter calculator comprises a noise generator configured for generating an encoding noise-like signal; and

    wherein the gain parameter calculator comprises a shaping processor configured for shaping a spectrum of the encoding noise-like signal using the speech related spectral shaping information and a variable amplifier configured for amplifying the spectrally shaped encoding noise-like signal to obtain an amplified shaped encoding noise-like signal and a controller for calculating the gain parameter based on the amplified shaped encoding noise-like signal;

    wherein one or more of the analyzer, the formant information calculator, the gain parameter calculator and the bitstream former is implemented, at least in part, by one or more hardware elements of the encoder;

    wherein the shaping processor is configured for combining a spectrum of the encoding noise-like signal or a spectrum derived thereof and a transfer function comprising

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