Support of a multichannel audio extension
First Claim
1. Method for supporting a multichannel audio extension at an encoding end of a multichannel audio coding system, said method comprising:
- generating and providing first multichannel extension information at least for higher frequencies of a multichannel audio signal, which first multichannel extension information allows to reconstruct at least said higher frequencies of said multichannel audio signal based on a mono audio signal available for said multichannel audio signal;
generating and providing second multichannel extension information for lower frequencies of said multichannel audio signal, which second multichannel extension information allows to reconstruct said lower frequencies of said multichannel audio signal based on said mono audio signal with a higher accuracy than said first multichannel extension information allows to reconstruct at least said higher frequencies of said multichannel audio signal; and
generating and providing in addition an indication for additional use in a reconstruction of the lower frequencies of the multichannel audio signal, said indication comprising a first bit indicating whether any channel of said multichannel audio signal is considerably stronger at said lower frequencies of said multichannel audio signal than another channel of said multichannel audio signal, and said indication comprising at least in the case that a channel of said multichannel audio signal is considerably stronger at said lower frequencies of said multichannel audio signal than another channel of said multichannel audio signal a second bit indicating which channel of said multichannel audio signal is considerably stronger than another channel of said multichannel audio signal.
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Accused Products
Abstract
Methods and units supporting a multichannel audio extension in a multichannel audio coding system are shown. In order to allow an efficient extension of an available mono audio signal {tilde over (M)} of a multichannel audio signal L/R, it is proposed that an encoding end of the multichannel audio coding system provides dedicated multichannel extension information for lower frequencies of the multichannel audio signal L/R, in addition to multichannel extension information at least for higher frequencies of the multichannel audio signal L/R. This dedicated multichannel extension information enables a decoding end of the multichannel audio coding system to reconstruct the lower frequencies of the multichannel audio signal L/R with a higher accuracy than the higher frequencies of the multichannel audio signal L/R.
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Citations
31 Claims
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1. Method for supporting a multichannel audio extension at an encoding end of a multichannel audio coding system, said method comprising:
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generating and providing first multichannel extension information at least for higher frequencies of a multichannel audio signal, which first multichannel extension information allows to reconstruct at least said higher frequencies of said multichannel audio signal based on a mono audio signal available for said multichannel audio signal; generating and providing second multichannel extension information for lower frequencies of said multichannel audio signal, which second multichannel extension information allows to reconstruct said lower frequencies of said multichannel audio signal based on said mono audio signal with a higher accuracy than said first multichannel extension information allows to reconstruct at least said higher frequencies of said multichannel audio signal; and generating and providing in addition an indication for additional use in a reconstruction of the lower frequencies of the multichannel audio signal, said indication comprising a first bit indicating whether any channel of said multichannel audio signal is considerably stronger at said lower frequencies of said multichannel audio signal than another channel of said multichannel audio signal, and said indication comprising at least in the case that a channel of said multichannel audio signal is considerably stronger at said lower frequencies of said multichannel audio signal than another channel of said multichannel audio signal a second bit indicating which channel of said multichannel audio signal is considerably stronger than another channel of said multichannel audio signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 20, 21)
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12. Method for supporting a multichannel audio extension at a decoding end of a multichannel audio coding system, said method comprising:
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reconstructing at least higher frequencies of a multichannel audio signal based on received first multichannel extension information for said multichannel audio signal and on a received mono audio signal for said multichannel audio signal; and reconstructing lower frequencies of said multichannel audio signal based on received second multichannel extension information, on an indication comprising a first bit indicating whether any channel of said multichannel audio signal is considerably stronger at said lower frequencies of said multichannel audio signal than another channel of said multichannel audio signal and comprising at least in the case that a channel of said multichannel audio signal is considerably stronger at said lower frequencies of said multichannel audio signal than another channel of said multichannel audio signal a second bit indicating which channel of said multichannel audio signal is considerably stronger than another channel of said multichannel audio signal, and on said received mono audio signal with a higher accuracy than said higher frequencies; and combining said reconstructed higher frequencies and said reconstructed lower frequencies to a reconstructed multichannel audio signal. - View Dependent Claims (13, 14, 22)
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15. An apparatus comprising:
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an information generation component configured to generate and provide first multichannel extension information at least for higher frequencies of a multichannel audio signal, which first multichannel extension information allows to reconstruct at least said higher frequencies of said multichannel audio signal based on a mono audio signal available for said multichannel audio signal; an information generation component configured to generate and provide second multichannel extension information for lower frequencies of said multichannel audio signal, which second multichannel extension information allows to reconstruct said lower frequencies of said multichannel audio signal based on said mono audio signal with a higher accuracy than said first multichannel extension information allows to reconstruct at least said higher frequencies of said multichannel audio signal; and an information generation component configured to generate and provide in addition an indication for additional use in a reconstruction of the lower frequencies of the multichannel audio signal, said indication comprising a first bit indicating whether any channel of said multichannel audio signal is considerably stronger at said lower frequencies of said multichannel audio signal than another channel of said multichannel audio signal, and said indication comprising at least in the case that a channel of said multichannel audio signal is considerably stronger at said lower frequencies of said multichannel audio signal than another channel of said multichannel audio signal a second bit indicating which channel of said multichannel audio signal is considerably stronger than another channel of said multichannel audio signal. - View Dependent Claims (16, 19, 25, 26, 27, 28, 29)
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17. An apparatus for supporting a multichannel audio extension at a decoding end of a multichannel audio coding system, said apparatus comprising:
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a reconstruction component configured to reconstruct at least higher frequencies of a multichannel audio signal based on received first multichannel extension information for said multichannel audio signal and on a received mono audio signal for said multichannel audio signal; and a reconstruction component configured to reconstruct lower frequencies of said multichannel audio signal based on received second multichannel extension information, on an indication comprising a first bit indicating whether any channel of said multichannel audio signal is considerably stronger at said lower frequencies of said multichannel audio signal than another channel of said multichannel audio signal and comprising at least in the case that a channel of said multichannel audio signal is considerably stronger at said lower frequencies of said multichannel audio signal than another channel of said multichannel audio signal a second bit indicating which channel of said multichannel audio signal is considerably stronger than another channel of said multichannel audio signal, and on said received mono audio signal with a higher accuracy than said higher frequencies; and a combining component configured to combine said reconstructed higher frequencies and said reconstructed lower frequencies to a reconstructed multichannel audio signal. - View Dependent Claims (18, 30, 31)
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23. An apparatus for supporting a multichannel audio extension at an encoding end of a multichannel audio coding system, said apparatus comprising:
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means for generating and providing first multichannel extension information at least for higher frequencies of a multichannel audio signal, which first multichannel extension information allows to reconstruct at least said higher frequencies of said multichannel audio signal based on a mono audio signal available for said multichannel audio signal; means for generating and providing second multichannel extension information for lower frequencies of said multichannel audio signal, which second multichannel extension information allows to reconstruct said lower frequencies of said multichannel audio signal based on said mono audio signal with a higher accuracy than said first multichannel extension information allows to reconstruct at least said higher frequencies of said multichannel audio signal; and means for generating and providing in addition an indication for additional use in a reconstruction of the lower frequencies of the multichannel audio signal, said indication comprising a first bit indicating whether any channel of said multichannel audio signal is considerably stronger at said lower frequencies of said multichannel audio signal than another channel of said multichannel audio signal, and said indication comprising at least in the case that a channel of said multichannel audio signal is considerably stronger at said lower frequencies of said multichannel audio signal than another channel of said multichannel audio signal a second bit indicating which channel of said multichannel audio signal is considerably stronger than another channel of said multichannel audio signal.
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24. An apparatus comprising:
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means for reconstructing at least higher frequencies of a multichannel audio signal based on received first multichannel extension information for said multichannel audio signal and on a received mono audio signal for said multichannel audio signal; and means for reconstructing lower frequencies of said multichannel audio signal based on received second multichannel extension information, on an indication comprising a first bit indicating whether any channel of said multichannel audio signal is considerably stronger at said lower frequencies of said multichannel audio signal than another channel of said multichannel audio signal and comprising at least in the case that a channel of said multichannel audio signal is considerably stronger at said lower frequencies of said multichannel audio signal than another channel of said multichannel audio signal a second bit indicating which channel of said multichannel audio signal is considerably stronger than another channel of said multichannel audio signal, and on said received mono audio signal with a higher accuracy than said higher frequencies; and means for combining said reconstructed higher frequencies and said reconstructed lower frequencies to a reconstructed multichannel audio signal.
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Specification