Audio decoder and method for providing a decoded audio information using an error concealment based on a time domain excitation signal
AssigneeFraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
InventorsJérémie Lecomte, Goran Markovic, Michael Schnabel, Grzegorz Pietrzyk
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Abstract
An audio decoder for providing a decoded audio information on the basis of an encoded audio information includes an error concealment configured to provide an error concealment audio information for concealing a loss of an audio frame following an audio frame encoded in a frequency domain representation using a time domain excitation signal.
Claims4
An audio decoder for providing a decoded audio information on the basis of an encoded audio information, the audio decoder comprising:
- an error concealment unit configured to provide an error concealment audio information for concealing a loss of an audio frame following an audio frame encoded in a frequency domain representation using a time domain excitation signal;
- wherein the error concealment unit is configured to modify a time domain excitation signal acquired on the basis of one or more audio frames preceding a lost audio frame, in order to acquire the error concealment audio information;
- wherein the error concealment unit is configured to time-scale the time domain excitation signal acquired on the basis of one or more audio frames preceding a lost audio frame, or the one or more copies thereof, in dependence on a prediction of a pitch for the time of the one or more lost audio frames.
A method for providing a decoded audio information on the basis of an encoded audio information, the method comprising:
- providing an error concealment audio information for concealing a loss of an audio frame following an audio frame encoded in a frequency domain representation using a time domain excitation signal;
- wherein a time domain excitation signal acquired on the basis of one or more audio frames preceding a lost audio frame is modified, in order to acquire the error concealment audio information;
- wherein the time domain excitation signal acquired on the basis of one or more audio frames preceding a lost audio frame, or the one or more copies thereof, is time-scaled in dependence on a prediction of a pitch for the time of the one or more lost audio frames.
An audio decoder for providing a decoded audio information on the basis of an encoded audio information, the audio decoder comprising:
- a spectral value decoding unit to provide decoded spectral values, which are used for a provision of a time-domain representation, on the basis of encoded spectral values;
- and
- an error concealment unit configured to provide an error concealment audio information for concealing a loss of an audio frame following an audio frame encoded in a frequency domain representation which comprises the encoded spectral values using a time domain excitation signal;
- wherein the error concealment unit is configured to modify a time domain excitation signal acquired on the basis of one or more audio frames preceding a lost audio frame, in order to acquire the error concealment audio information;
- wherein the error concealment unit is configured to time-scale the time domain excitation signal acquired on the basis of one or more audio frames preceding a lost audio frame, or the one or more copies thereof, in dependence on a prediction of a pitch for the time of the one or more lost audio frames.
Dependencies are inferred from the claim text.