Frame loss concealment for a low-frequency effects channel
AssigneeDolby International AB
InventorStefan BRUHN
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Abstract
A method of generating a substitution frame for a lost audio frame of an audio signal is presented. The method may comprise determining an audio filter based on samples of a valid audio frame preceding the lost audio frame. The method may comprise generating the substitution frame based on the audio filter and the samples of the valid audio frame preceding the lost audio frame. The method may be advantageously applied to a low frequency effects (LFE) channel of a multi-channel audio signal.
Claims3
A method of generating substitution frames for a plurality of lost audio frames of an audio signal, the method comprising:
- determining an audio filter based on samples of a valid audio frame preceding the plurality of lost audio frames;
- determining a first modified audio filter by scaling audio filter coefficients of the audio filter using a first bandwidth sharpening factor;
- determining a second modified audio filter by scaling said audio filter coefficients using a second bandwidth sharpening factor;
- generating substitution frames based on the first modified audio filter for the first M lost audio frames of the plurality of lost audio frames;
- and
- generating substitution frames based on the second modified audio filter for the (M+1)th lost audio frames of the plurality of lost audio frames and all following lost audio frames such that the audio signal is damped for the latter frames.
A system comprising:
- one or more processors;
- and
- a non-transitory computer-readable medium storing instructions that, when executed by the one or more processors, cause the one or more processors to perform a method of generating substitution frames for a plurality of lost audio frames of an audio signal, the method comprising:
- determining an audio filter based on samples of a valid audio frame preceding the plurality of lost audio frames;
- determining a first modified audio filter by scaling audio filter coefficients of the audio filter using a first bandwidth sharpening factor;
- determining a second modified audio filter by scaling said audio filter coefficients using a second bandwidth sharpening factor;
- generating substitution frames based on the first modified audio filter for the first M lost audio frames of the plurality of lost audio frames;
- and
- generating substitution frames based on the second modified audio filter for the (M+1)th lost audio frames of the plurality of lost audio frames and all following lost audio frames such that the audio signal is damped for the latter frames.
A non-transitory computer-readable medium storing instructions that, when executed by one or more processors, cause the one or more processors to perform a method of generating substitution frames for a plurality of lost audio frames of an audio signal, the method comprising:
- determining an audio filter based on samples of a valid audio frame preceding the plurality of lost audio frames;
- determining a first modified audio filter by scaling audio filter coefficients of the audio filter using a first bandwidth sharpening factor;
- determining a second modified audio filter by scaling said audio filter coefficients using a second bandwidth sharpening factor;
- generating substitution frames based on the first modified audio filter for the first M lost audio frames of the plurality of lost audio frames;
- and
- generating substitution frames based on the second modified audio filter for the (M+1)th lost audio frames of the plurality of lost audio frames and all following lost audio frames such that the audio signal is damped for the latter frames.
Dependencies are inferred from the claim text.