APPARATUS AND METHOD FOR SYNTHESIZING AN AUDIO SIGNAL, DECODER, ENCODER, SYSTEM AND COMPUTER PROGRAM
First Claim
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1. 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,wherein the apparatus is configured to determine the spectral tilt of the current frame of the audio signal on the basis of spectral envelope information for the current frame of the audio signal, andwherein the processing unit is configured to apply the spectral tilt by filtering the code from the codebook based on a transfer function modeling the spectral tilt.
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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.
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27 Claims
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1. An apparatus for synthesizing an audio signal, comprising:
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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, wherein the apparatus is configured to determine the spectral tilt of the current frame of the audio signal on the basis of spectral envelope information for the current frame of the audio signal, and wherein the processing unit is configured to apply the spectral tilt by filtering the code from the codebook based on a transfer function modeling the spectral tilt. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for synthesizing an audio signal, the method comprising:
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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, wherein the spectral tilt of the current frame of the audio signal is determined on the basis of spectral envelope information for the current frame of the audio signal, and wherein applying the spectral tilt comprises filtering the code from the codebook based on a transfer function modeling the spectral tilt. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification