Critical sampling encoding with a predictive encoder
First Claim
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1. A method for coding a digital audio signal, said method being performed by a coding entity comprising a processing unit, a transform coder and a predictive coder, comprising the steps of:
- receiving a digital audio signal by the processing unit and determining a first and a second sequence of samples of the digital audio signal;
coding, by the transform coder, of the first sequence of samples according to a transform coding;
coding, by the predictive coder, of the second sequence of samples according to a predictive coding;
wherein the second sequence begins before the end of the first sequence, a sub-sequence of samples being common to the first and second sequences, the sub-sequence being coded at the same time by predictive coding and by transform coding.
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Abstract
A method for encoding and decoding a digital audio signal is provided, said method comprising the steps of: encoding a first sequence of samples of the digital signal according to a transform encoding; encoding a second sequence of samples of the digital signal according to a predictive encoding; wherein the second sequence starts before the end of the first sequence, a subsequence common to the first and second sequences being thus encoded both by predictive encoding and by transform encoding.
22 Citations
15 Claims
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1. A method for coding a digital audio signal, said method being performed by a coding entity comprising a processing unit, a transform coder and a predictive coder, comprising the steps of:
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receiving a digital audio signal by the processing unit and determining a first and a second sequence of samples of the digital audio signal; coding, by the transform coder, of the first sequence of samples according to a transform coding; coding, by the predictive coder, of the second sequence of samples according to a predictive coding; wherein the second sequence begins before the end of the first sequence, a sub-sequence of samples being common to the first and second sequences, the sub-sequence being coded at the same time by predictive coding and by transform coding. - View Dependent Claims (2, 3, 4, 5, 10)
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6. A method for decoding a digital audio signal, said method being performed by a decoding entity comprising first and second reception units, an inverse transform application unit, a transform decoding unit, a decoding unit and a predictive decoding unit, comprising the steps of:
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receiving, by the first reception unit, of a transform vector coding a first sequence of samples of the digital audio signal according to a transform coding; receiving, by the second reception unit, a prediction vector coding a second sequence of samples of the digital audio signal according to a predictive coding; wherein the second sequence begins before the end of the first sequence, a sub-sequence of samples being common to the first and second sequences, the sub-sequence being received coded at the same time by predictive coding and by transform coding; and
wherein the method further comprises the steps of;a) applying to the transform vector, by an inverse transform application unit, a transform inverse to the transform coding to decode a sub-sequence of samples of the first sequence not coded by predictive coding; b) decoding at least in the prediction vector, by the decoding unit, the sub-sequence of samples common to the first and second sequences at least by a predictive decoding, based on at least one sample arising from step a); and c) decoding in the predictive vector by the predictive decoding unit a sub-sequence of samples of the second sequence not coded by transform coding, based on at least one sample arising from one of steps a) and b). - View Dependent Claims (7, 8, 9, 11)
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12. A coding entity for a digital audio signal, comprising:
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a processing unit for receiving a digital audio signal and determining a first and a second sequence of samples of the digital audio signal; a transform coder for coding the first sequence of samples according to a transform coding; and a predictive coder for coding the second sequence of samples according to a predictive coding; wherein the second sequence begins before the end of the first sequence, a sub-sequence of samples being common to the first and second sequences, the sub-sequence being coded at the same time by predictive coding and by transform coding.
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13. A decoding entity for a digital audio signal, comprising:
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a first reception unit for receiving a transform vector coding a first sequence of samples of the digital audio signal according to a transform coding; and a second reception unit for receiving a prediction vector coding a second sequence of samples of the digital audio signal according to a predictive coding; wherein the second sequence begins before the end of the first sequence, a sub-sequence of samples being common to the first and second sequences, the sub-sequence being coded at the same time by predictive coding and by transform coding; and
wherein the decoding entity further comprises;a first decoder for applying to the transform vector a transform inverse to the transform coding to decode a sub-sequence of samples of the first sequence not coded by predictive coding; a second decoder for decoding at least in the predictive vector the sub-sequence of samples common to the first and second sequences at least by a predictive decoding, based on at least one sample arising from the first decoder; and a third predictive decoder for decoding in the predictive vector by a predictive decoding a sub-sequence of samples of the second sequence not coded by transform coding, based on at least one sample arising from one of the first and second decoders. - View Dependent Claims (14, 15)
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Specification