Temporal envelope shaping for spatial audio coding using frequency domain wiener filtering
First Claim
1. A method for audio signal decoding in which one or more input audio signals have been encoded into a bitstream comprising audio information and side information relating to the audio information and useful in decoding the bitstream, the encoding including processing that divides each of the one or more input audio signals into time blocks and updates at least some of the side information no more frequently than the block rate, such that the audio information, when encoded using the side information, has a resolution limited by the block rate, the encoding further including comparing an envelope of at least one input audio signal and an envelope of a signal based on the at least one input audio signal as encoded, the comparing providing a representation of the results of comparing, such representation being useful for improving the resolution of at least some of the audio information when decoded, and the encoding further including outputting at least some of the representations, comprising:
- receiving the bitstream, and decoding the bitstream, the decoding employing the audio information, the side information, and the outputted representations.
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Abstract
Certain types of parametric spatial coding encoders use interchannel amplitude differences, interchannel time differences, and interchannel coherence or correlation to build a parametric model of a multichannel soundfield that is used by a decoder to construct an approximation of the original soundfield. However, such a parametric model does not reconstruct the original temporal envelope of the soundfield'"'"'s channels, which has been found to be extremely important for some audio signals. The present invention provides for the reshaping the temporal envelope of one or more of the decoded channels in a spatial coding system to better match one or more original temporal envelopes.
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Citations
14 Claims
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1. A method for audio signal decoding in which one or more input audio signals have been encoded into a bitstream comprising audio information and side information relating to the audio information and useful in decoding the bitstream, the encoding including processing that divides each of the one or more input audio signals into time blocks and updates at least some of the side information no more frequently than the block rate, such that the audio information, when encoded using the side information, has a resolution limited by the block rate, the encoding further including comparing an envelope of at least one input audio signal and an envelope of a signal based on the at least one input audio signal as encoded, the comparing providing a representation of the results of comparing, such representation being useful for improving the resolution of at least some of the audio information when decoded, and the encoding further including outputting at least some of the representations, comprising:
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receiving the bitstream, and decoding the bitstream, the decoding employing the audio information, the side information, and the outputted representations. - View Dependent Claims (2, 3, 4, 5)
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6. An audio signal decoder in which one or more input audio signals have been encoded into a bitstream comprising audio information and side information relating to the audio information and useful in decoding the bitstream, the encoding including processing that divides each of the one or more input audio signals into time blocks and updates at least some of the side information no more frequently than the block rate, such that the audio information, when decoded using the side information, has a resolution limited by the block rate, the encoding further including comparing an envelope of at least one input audio signal and an envelope of a signal based on the at least one input audio signal as encoded, the comparing providing a representation of the results of comparing, such representations being useful for improving the resolution of at least some of the audio information when decoded, and the encoding further including outputting at least some of the representations, comprising:
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means for receiving the bitstream, and means for decoding the bitstream, the decoding employing the audio information, the side information and the outputted representations. - View Dependent Claims (7, 8, 9, 10)
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11. An audio decoder, comprising:
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a bitstream receiving device configured to receive an encoded signal and extract encoded audio and side information from the encoded signal;
a decoder configured to decode the encoded audio;
a re-shaping device configured to re-shape the decoded audio based on at least part of the side information. - View Dependent Claims (12, 13, 14)
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Specification