Frame loss management in an FD/LPD transition context
First Claim
1. A method for decoding a digital audio signal encoded using predictive coding and transform coding, wherein the method comprises the following operations:
- predictive decoding of a preceding frame of the digital audio signal, encoded by a set of predictive coding parameters; and
upon detecting the loss of a current frame of the encoded digital audio signal, before receiving a next frame following the current frame, and thus regardless of whether the next frame is encoded using predictive coding or encoded using transform coding or is a transition frame;
generating, by prediction, from at least one predictive coding parameter encoding the preceding frame, a replacement frame for the current frame;
generating, by prediction, from at least one predictive coding parameter encoding the preceding frame, an additional segment of digital audio signal; and
temporarily storing said additional segment of digital audio signal; and
upon receiving of the next frame, the method further comprises decoding said next frame using said additional segment of digital audio signal,wherein the next frame of encoded digital audio signal comprises at least one segment encoded by transform and decoding the next frame comprises a sub-step of overlap-adding the additional segment of digital audio signal and said segment encoded by transform by applying the following formula;
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Abstract
A method for decoding a digital signal encoded using predictive coding and transform coding, comprising the following steps: predictive decoding of a preceding frame of the digital signal, encoded by a set of predictive coding parameters; detecting the loss of a current frame of the encoded digital signal; generating by prediction, from at least one predictive coding parameter encoding the preceding frame, a frame for replacing the current frame; generating by prediction, from at least one predictive coding parameter encoding the preceding frame, an additional segment of digital signal; temporarily storing said additional segment of digital signal.
27 Citations
9 Claims
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1. A method for decoding a digital audio signal encoded using predictive coding and transform coding, wherein the method comprises the following operations:
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predictive decoding of a preceding frame of the digital audio signal, encoded by a set of predictive coding parameters; and upon detecting the loss of a current frame of the encoded digital audio signal, before receiving a next frame following the current frame, and thus regardless of whether the next frame is encoded using predictive coding or encoded using transform coding or is a transition frame; generating, by prediction, from at least one predictive coding parameter encoding the preceding frame, a replacement frame for the current frame; generating, by prediction, from at least one predictive coding parameter encoding the preceding frame, an additional segment of digital audio signal; and temporarily storing said additional segment of digital audio signal; and upon receiving of the next frame, the method further comprises decoding said next frame using said additional segment of digital audio signal, wherein the next frame of encoded digital audio signal comprises at least one segment encoded by transform and decoding the next frame comprises a sub-step of overlap-adding the additional segment of digital audio signal and said segment encoded by transform by applying the following formula; - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A decoder for a digital audio signal encoded using predictive coding and transform coding, wherein the decoder comprises:
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a detection unit for detecting the loss of a current frame of the digital audio signal; a predictive decoder comprising a processor arranged to carry out the following operations, upon detection of the loss of the current frame and before receiving of a next frame following the current frame, and thus regardless of whether the next frame is encoded using predictive coding or encoded using transform coding or is a transition frame; predictive decoding of a preceding frame of the digital audio signal, coded by a set of predictive coding parameters; generating, by prediction, from at least one predictive coding parameter encoding the preceding frame, a replacement frame for the current frame; generating, by prediction, from at least one predictive coding parameter encoding the preceding frame, an additional segment of digital audio signal; and temporarily storing said additional segment of digital audio signal in temporary memory; upon receiving of the next frame, the predictive decoder further comprises a transform decoder comprising a processor arranged to decode said next frame using said additional segment of digital audio signal, wherein the next frame of encoded digital audio signal comprises at least one segment encoded by transform and decoding the next frame comprises a sub-step of overlap-adding the additional segment of digital audio signal and said segment encoded by transform by applying the following formula; - View Dependent Claims (9)
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Specification