Audio coding system using characteristics of a decoded signal to adapt synthesized spectral components
First Claim
1. A method for processing encoded audio information, wherein the method comprises:
- receiving the encoded audio information and obtaining therefrom subband signals representing some but not all spectral content of an audio signal;
examining the subband signals to obtain a characteristic of the audio signal;
generating synthesized spectral components that have the characteristic of the audio signal;
integrating the synthesized spectral components with the subband signals to generate a set of modified subband signals; and
generating the audio information by applying a synthesis filterbank to the set of modified subband signals.
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Abstract
A receiver in an audio coding system receives a signal conveying frequency subband signals representing an audio signal. The subband signals are examined to assess one or more characteristics of the audio signal. Spectral components are synthesized having the assessed characteristics. The synthesized spectral components are integrated with the subband signals and passed through a synthesis filterbank to generate an output signal. In one implementation, the assessed characteristic is temporal shape and noise-like spectral components are synthesized having the temporal shape of the audio signal.
81 Citations
30 Claims
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1. A method for processing encoded audio information, wherein the method comprises:
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receiving the encoded audio information and obtaining therefrom subband signals representing some but not all spectral content of an audio signal;
examining the subband signals to obtain a characteristic of the audio signal;
generating synthesized spectral components that have the characteristic of the audio signal;
integrating the synthesized spectral components with the subband signals to generate a set of modified subband signals; and
generating the audio information by applying a synthesis filterbank to the set of modified subband signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A medium that is readable by a device and that conveys a program of instructions executable by the device to perform a method for processing encoded audio information, wherein the method comprises steps performing the acts of:
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receiving the encoded audio information and obtaining therefrom subband signals representing some but not all spectral content of an audio signal;
examining the subband signals to obtain a characteristic of the audio signal;
generating synthesized spectral components that have the characteristic of the audio signal;
integrating the synthesized spectral components with the subband signals to generate a set of modified subband signals; and
generating the audio information by applying a synthesis filterbank to the set of modified subband signals. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An apparatus for processing encoded audio information, wherein the apparatus comprises:
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an input terminal that receives the encoded audio information;
memory; and
processing circuitry coupled to the input terminal and the memory;
wherein the processing circuitry is adapted to;
receive the encoded audio information and obtain therefrom subband signals representing some but not all spectral content of an audio signal;
examine the subband signals to obtain a characteristic of the audio signal;
generate synthesized spectral components that have the characteristic of the audio signal;
integrate the synthesized spectral components with the subband signals to generate a set of modified subband signals; and
generate the audio information by applying a synthesis filterbank to the set of modified subband signals. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification