TRANSITION FROM A TRANSFORM CODING/DECODING TO A PREDICTIVE CODING/DECODING
First Claim
1. A decoding method for decoding a digital audio signal, comprising the following acts performed by a decoding device:
- receiving the digital audio signal;
decoding according to an inverse transform decoding of a previous frame of samples of the digital signal, received and coded according to a transform coding;
decoding according to a predictive decoding of a current frame of samples of the digital signal, received and coded according to a predictive coding, wherein the predictive decoding of the current frame is a transition predictive decoding which does not use any adaptive dictionary arising from the previous frame;
reinitializing at least one state of the predictive decoding to a predetermined default value; and
an overlap-add act, which combines a signal segment synthesized by the predictive decoding of the current frame and a signal segment synthesized by inverse transform decoding, corresponding to a stored segment of the decoding of the previous frame.
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Abstract
Methods and apparatus are provided for coding and decoding a digital audio signal. Decoding includes: decoding according to an inverse transform decoding of a previous frame of samples of the digital signal, which is received and coded according to a transform coding; and decoding according to a predictive decoding of a current frame of samples of the digital signal, which is received and coded according to a predictive coding. The predictive decoding of the current frame is a transition predictive decoding which does not use any adaptive dictionary arising from the previous frame. At least one state of the predictive decoding is reinitialized to a predetermined default value, and an add-overlap step combines a signal segment synthesized by predictive decoding of the current frame and a signal segment synthesized by inverse transform decoding, corresponding to a stored segment of the decoding of the previous frame.
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Citations
16 Claims
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1. A decoding method for decoding a digital audio signal, comprising the following acts performed by a decoding device:
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receiving the digital audio signal; decoding according to an inverse transform decoding of a previous frame of samples of the digital signal, received and coded according to a transform coding; decoding according to a predictive decoding of a current frame of samples of the digital signal, received and coded according to a predictive coding, wherein the predictive decoding of the current frame is a transition predictive decoding which does not use any adaptive dictionary arising from the previous frame; reinitializing at least one state of the predictive decoding to a predetermined default value; and an overlap-add act, which combines a signal segment synthesized by the predictive decoding of the current frame and a signal segment synthesized by inverse transform decoding, corresponding to a stored segment of the decoding of the previous frame. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for coding a digital audio signal, comprising the following acts performed by a coding device:
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coding of a previous frame of samples of the digital signal according to a transform coding; reception of a current frame of samples of the digital signal to be coded according to a predictive coding, wherein the predictive coding of the current frame is a transition predictive coding which does not use any adaptive dictionary arising from the previous frame; and reinitializing at least one state of the predictive coding to a predetermined default value. - View Dependent Claims (10, 11, 12, 13)
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14. A digital audio signal decoder, comprising:
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an inverse transform decoding entity configured to decode a previous frame of samples of the digital signal, received and coded according to a transform coding; a predictive decoding entity configured to decode a current frame of samples of the digital signal, received and coded according to a predictive coding, wherein the predictive decoding of the current frame is a transition predictive decoding which does not use any adaptive dictionary arising from the previous frame; a reinitialization module configured to reinitialize at least one state of the predictive decoding by a predetermined default value; and a processing module configured to perform an overlap-add which combines a signal segment synthesized by predictive decoding of the current frame and a signal segment synthesized by inverse transform decoding, corresponding to a stored segment of the decoding of the previous frame.
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15. A digital audio signal coder, comprising:
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a transform coding entity configured to code a previous frame of samples of the digital signal; a predictive coding entity configured to code a current frame of samples of the digital signal, wherein the predictive coding of the current frame is a transition predictive coding which does not use any adaptive dictionary arising from the previous frame; and a reinitialization module configured to reinitialize at least one state of the predictive coding by a predetermined default value.
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16. A non-transitory computer-readable medium comprising a computer program stored thereon having instructions for execution of a decoding method when the instructions are executed by a processor of a decoding device, wherein the instructions configure the decoding device to perform acts of:
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receiving a digital audio signal; decoding according to an inverse transform decoding of a previous frame of samples of the digital audio signal, received and coded according to a transform coding; decoding according to a predictive decoding of a current frame of samples of the digital signal, received and coded according to a predictive coding, wherein the predictive decoding of the current frame is a transition predictive decoding which does not use any adaptive dictionary arising from the previous frame; reinitializing at least one state of the predictive decoding to a predetermined default value; and an overlap-add act, which combines a signal segment synthesized by the predictive decoding of the current frame and a signal segment synthesized by inverse transform decoding, corresponding to a stored segment of the decoding of the previous frame.
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Specification