Apparatus and method for synthesizing an audio signal, decoder, encoder, system and computer program
AssigneeFraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
InventorsGuillaume FUCHS, Tom BAECKSTROEM, Ralf GEIGER, Wolfgang JAEGERS, Emmanuel RAVELLI
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Abstract
A method and an apparatus for synthesizing an audio signal are described. A spectral tilt is applied to the code of a codebook used for synthesizing a current frame of the audio signal. The spectral tilt is based on the spectral tilt of the current frame of the audio signal. Further, an audio decoder operating in accordance with the inventive approach is described.
Claims33
An apparatus for synthesizing an audio signal, comprising:
- a processing unit configured to apply a spectral tilt to the code of a codebook used for synthesizing a current frame of the audio signal,
- wherein the spectral tilt is based on the spectral tilt of the current frame of the audio signal.
An audio decoder comprising an apparatus for synthesizing an audio signal, said apparatus comprising:
- a processing unit configured to apply a spectral tilt to the code of a codebook used for synthesizing a current frame of the audio signal,
- wherein the spectral tilt is based on the spectral tilt of the current frame of the audio signal.
An audio decoder for decoding an audio signal, wherein the audio decoder is configured to apply a spectral tilt to the code of a codebook used for synthesizing a current frame of the audio signal, wherein the spectral tilt is based on the spectral tilt of the current frame of the audio signal.
An audio encoder for encoding an audio signal, wherein the audio encoder is configured to determine from a spectral tilt of a current frame of the audio signal a spectral tilt for a code of a codebook representing a current frame of the audio signal.
A system, comprising:
- an audio decoder comprising an apparatus for synthesizing an audio signal, said apparatus comprising:
- a processing unit configured to apply a spectral tilt to the code of a codebook used for synthesizing a current frame of the audio signal,
- wherein the spectral tilt is based on the spectral tilt of the current frame of the audio signal, and
- an audio encoder for encoding an audio signal, wherein the audio encoder is configured to determine from a spectral tilt of a current frame of the audio signal a spectral tilt for a code of a codebook representing a current frame of the audio signal.
A method for synthesizing an audio signal, the method comprising:
- applying a spectral tilt to the code of a codebook used for synthesizing a current frame of the audio signal,
- wherein the spectral tilt is determined on the basis of the spectral tilt of the current frame of the audio signal.
A non-transitory digital storage medium having a computer program stored thereon to perform a method for synthesizing an audio signal, which method comprises:
- applying a spectral tilt to the code of a codebook used for synthesizing a current frame of the audio signal,
- wherein the spectral tilt is determined on the basis of the spectral tilt of the current frame of the audio signal,
- when said computer program is run by a computer.
Dependencies are inferred from the claim text.