Support of a multichannel audio extension
First Claim
1. A method for supporting a multichannel audio extension at an encoding end of a multichannel audio coding system, said method comprising:
- transforming a first channel signal of a multichannel audio signal into the frequency domain, resulting in a spectral first channel signal;
transforming a second channel signal of said multichannel audio signal into the frequency domain, resulting in a spectral second channel signal; and
determining for each of a plurality of adjacent frequency bands of said transformed multichannel audio signals whether said spectral first channel signal, said spectral second channel signal or none of said spectral channel signals is dominant in the respective frequency band and providing a corresponding state information for each of said adjacent frequency bands.
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Abstract
The invention relates to methods and units supporting a multichannel audio extension. In order to allow an efficient extension requiring a low computational complexity, it is proposed that at an encoding end, at least state information is provided as side information for a provided mono audio signal (M) generated out of a multichannel audio signal. The state information indicates for each of a plurality of frequency bands how a predetermined or equally provided gain value is to be applied in the frequency domain to the mono audio signal (M) for obtaining first and a second channel signals (L,R) of a reconstructed multichannel audio signal.
29 Citations
41 Claims
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1. A method for supporting a multichannel audio extension at an encoding end of a multichannel audio coding system, said method comprising:
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transforming a first channel signal of a multichannel audio signal into the frequency domain, resulting in a spectral first channel signal; transforming a second channel signal of said multichannel audio signal into the frequency domain, resulting in a spectral second channel signal; and determining for each of a plurality of adjacent frequency bands of said transformed multichannel audio signals whether said spectral first channel signal, said spectral second channel signal or none of said spectral channel signals is dominant in the respective frequency band and providing a corresponding state information for each of said adjacent frequency bands. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for supporting a multichannel audio extension at a decoding end of a multichannel audio coding system, said method comprising:
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transforming a received mono audio signal into the frequency domain, resulting in a spectral mono audio signal; and generating a spectral first channel signal and a spectral second channel signal out of said spectral mono audio signal by weighting said spectral mono audio signal separately in each of a plurality of adjacent frequency bands for each of said spectral first channel signal and said spectral second channel signal based on at least one gain value and in accordance with a received state information, said state information indicating for each of said adjacent frequency bands whether said spectral first channel signal, said spectral second channel signal or none of said spectral channel signals is to be dominant within the respective frequency band. - View Dependent Claims (10, 11, 12, 13, 14)
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15. An apparatus comprising a stereo extension encoder implemented at least partly in hardware,
said stereo extension encoder configured to transform a first channel signal of a multichannel audio signal into the frequency domain, resulting in a spectral first channel signal; -
said stereo extension encoder configured to transform a second channel signal of said multichannel audio signal into the frequency domain, resulting in a spectral second channel signal; said stereo extension encoder configured to determine for each of a plurality of adjacent frequency bands of said transformed multichannel audio signals whether said spectral first channel signal, said spectral second channel signal or none of said spectral channel signals is dominant in the respective frequency band; and said stereo extension encoder configured to provide a corresponding state information for each of said adjacent frequency bands. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 41)
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29. An apparatus comprising a stereo extension decoder implemented at least partly in hardware,
said stereo extension decoder configured to transform a received mono audio signal into the frequency domain, resulting in a spectral mono audio signal; - and
said stereo extension decoder configured to generate a spectral first channel signal and a spectral second channel signal out of said spectral mono audio signal by weighting said spectral mono audio signal separately in each of a plurality of adjacent frequency bands for each of said spectral first channel signal and said spectral second channel signal based on at least one gain value and in accordance with a received state information, said state information indicating for each of said adjacent frequency bands whether said spectral first channel signal, said spectral second channel signal or none of said spectral channel signals is to be dominant within the respective frequency band. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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Specification