Apparatus and method for error concealment in low-delay unified speech and audio coding
First Claim
1. An apparatus for generating spectral replacement values for an audio signal comprising:
- a buffer unit for storing previous spectral values relating to a previously received error-free audio signal frame, anda concealment frame generator for generating the spectral replacement values when a current audio signal frame has not been received or is erroneous, wherein the previously received error-free audio signal frame comprises filter information, the filter information comprising an associated filter stability value indicating a stability of a prediction filter, and wherein the concealment frame generator is adapted to generate the spectral replacement values based on the previous spectral values and based on the filter stability value,wherein during a playback of the audio signal, at a receiver, the current audio signal frame that has not been received in time or is erroneous is replaced with a synthesized representation of the generated spectral replacement values,wherein the apparatus is implemented using a hardware apparatus or a computer or a combination of a hardware apparatus and a computer.
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Abstract
An apparatus for generating spectral replacement values for an audio signal has a buffer unit for storing previous spectral values relating to a previously received error-free audio frame. Moreover, the apparatus includes a concealment frame generator for generating the spectral replacement values, when a current audio frame has not been received or is erroneous. The previously received error-free audio frame has filter information, the filter information having associated a filter stability value indicating a stability of a prediction filter. The concealment frame generator is adapted to generate the spectral replacement values based on the previous spectral values and based on the filter stability value.
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Citations
16 Claims
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1. An apparatus for generating spectral replacement values for an audio signal comprising:
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a buffer unit for storing previous spectral values relating to a previously received error-free audio signal frame, and a concealment frame generator for generating the spectral replacement values when a current audio signal frame has not been received or is erroneous, wherein the previously received error-free audio signal frame comprises filter information, the filter information comprising an associated filter stability value indicating a stability of a prediction filter, and wherein the concealment frame generator is adapted to generate the spectral replacement values based on the previous spectral values and based on the filter stability value, wherein during a playback of the audio signal, at a receiver, the current audio signal frame that has not been received in time or is erroneous is replaced with a synthesized representation of the generated spectral replacement values, wherein the apparatus is implemented using a hardware apparatus or a computer or a combination of a hardware apparatus and a computer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for generating spectral replacement values for an audio signal comprising:
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storing previous spectral values relating to a previously received error-free audio signal frame, and generating the spectral replacement values when a current audio signal frame has not been received or is erroneous, wherein the previously received error-free audio signal frame comprises filter information, the filter information comprising an associated filter stability value indicating a stability of a prediction filter defined by the filter information, wherein the spectral replacement values are generated based on the previous spectral values and based on the filter stability value, wherein during a playback of the audio signal, at a receiver, the current audio signal frame that has not been received in time or is erroneous is replaced with a synthesized representation of the generated spectral replacement values, wherein the method is performed using a hardware apparatus or a computer or a combination of a hardware apparatus and a computer. - View Dependent Claims (16)
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Specification