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
First Claim
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1. Audio encoder for encoding an audio signal, comprising:
- a time warper for warping an audio signal using a variable time warping characteristic;
a time/frequency converter for converting a time warped audio signal into a spectral representation comprising a number of spectral coefficients; and
a processor for processing a variable number of spectral coefficients to generate an encoded audio signal,wherein the processor is configured for variably setting a number of spectral coefficients for a frame of the audio signal based on the time warping characteristic for the frame so that a bandwidth variation represented by the processed number of frequency coefficients from frame to frame is reduced or eliminated.
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Abstract
An audio encoder has a window function controller, a windower, a time warper with a final quality check functionality, a time/frequency converter, a TNS stage or a quantizer encoder, the window function controller, the time warper, the TNS stage or an additional noise filling analyzer are controlled by signal analysis results obtained by a time warp analyzer or a signal classifier. Furthermore, a decoder applies a noise filling operation using a manipulated noise filling estimate depending on a harmonic or speech characteristic of the audio signal.
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Citations
9 Claims
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1. Audio encoder for encoding an audio signal, comprising:
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a time warper for warping an audio signal using a variable time warping characteristic; a time/frequency converter for converting a time warped audio signal into a spectral representation comprising a number of spectral coefficients; and a processor for processing a variable number of spectral coefficients to generate an encoded audio signal, wherein the processor is configured for variably setting a number of spectral coefficients for a frame of the audio signal based on the time warping characteristic for the frame so that a bandwidth variation represented by the processed number of frequency coefficients from frame to frame is reduced or eliminated. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. Method for encoding an audio signal, comprising:
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time warping an audio signal using a variable time warping characteristic; converting a time warped audio signal into a spectral representation comprising a number of spectral coefficients; and processing a variable number of spectral coefficients to generate an encoded audio signal, wherein a variable number of spectral coefficients for a frame of the audio signal is set based on the time warping characteristic for the frame so that a bandwidth variation represented by the processed number of frequency coefficients from frame to frame is reduced or eliminated. - View Dependent Claims (9)
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Specification