AUDIO ENCODER FOR ENCODING A MULTICHANNEL SIGNAL AND AUDIO DECODER FOR DECODING AN ENCODED AUDIO SIGNAL
First Claim
1. An audio encoder for encoding a multichannel signal, comprising:
- a downmixer for downmixing the multichannel signal to acquire a downmix signal,a linear prediction domain core encoder for encoding the downmix signal, wherein the downmix signal comprises a low band and a high band, wherein the linear prediction domain core encoder is configured to apply a bandwidth extension processing for parametrically encoding the high band;
a filterbank for generating a spectral representation of the multichannel signal; and
a joint multichannel encoder configured to process the spectral representation comprising the low band and the high band of the multichannel signal to generate multichannel information.
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Abstract
Audio encoder for encoding a multichannel signal is shown. The audio encoder includes a downmixer for downmixing the multichannel signal to obtain a downmix signal, a linear prediction domain core encoder for encoding the downmix signal, wherein the downmix signal has a low band and a high band, wherein the linear prediction domain core encoder is configured to apply a bandwidth extension processing for parametrically encoding the high band, a filterbank for generating a spectral representation of the multichannel signal, and a joint multichannel encoder configured to process the spectral representation including the low band and the high band of the multichannel signal to generate multichannel information.
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22 Claims
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1. An audio encoder for encoding a multichannel signal, comprising:
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a downmixer for downmixing the multichannel signal to acquire a downmix signal, a linear prediction domain core encoder for encoding the downmix signal, wherein the downmix signal comprises a low band and a high band, wherein the linear prediction domain core encoder is configured to apply a bandwidth extension processing for parametrically encoding the high band; a filterbank for generating a spectral representation of the multichannel signal; and a joint multichannel encoder configured to process the spectral representation comprising the low band and the high band of the multichannel signal to generate multichannel information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An audio decoder for decoding an encoded audio signal comprising a core encoded signal, bandwidth extension parameters, and multichannel information, the audio decoder comprising:
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a linear prediction domain core decoder for decoding the core encoded signal to generate a mono signal; an analysis filterbank to convert the mono signal into a spectral representation; a multichannel decoder for generating a first channel spectrum and a second channel spectrum from the spectral representation of the mono signal and the multichannel information; and a synthesis filterbank processor for synthesis filtering the first channel spectrum to acquire a first channel signal and for synthesis filtering the second channel spectrum to acquire a second channel signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A method for encoding a multichannel signal, the method comprising:
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downmixing the multichannel signal to acquire a downmix signal, encoding the downmix signal, wherein the downmix signal comprises a low band and a high band, wherein the linear prediction domain core encoder is configured to apply a bandwidth extension processing for parametrically encoding the high band; generating a spectral representation of the multichannel signal; and processing the spectral representation comprising the low band and the high band of the multichannel signal to generate multichannel information.
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20. A method of decoding an encoded audio signal, comprising a core encoded signal, bandwidth extension parameters, and multichannel information, the method comprising
decoding the core encoded signal to generate a mono signal; -
converting the mono signal into a spectral representation; generating a first channel spectrum and a second channel spectrum from the spectral representation of the mono signal and the multichannel information; synthesis filtering the first channel spectrum to acquire a first channel signal and synthesis filtering the second channel spectrum to acquire a second channel signal.
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21. A non-transitory digital storage medium having a computer program stored thereon to perform the method for encoding a multichannel signal, the method comprising:
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downmixing the multichannel signal to acquire a downmix signal, encoding the downmix signal, wherein the downmix signal comprises a low band and a high band, wherein the linear prediction domain core encoder is configured to apply a bandwidth extension processing for parametrically encoding the high band; generating a spectral representation of the multichannel signal; and processing the spectral representation comprising the low band and the high band of the multichannel signal to generate multichannel information, when said computer program is run by a computer.
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22. A non-transitory digital storage medium having a computer program stored thereon to perform the method of decoding an encoded audio signal, comprising a core encoded signal, bandwidth extension parameters, and multichannel information, the method comprising
decoding the core encoded signal to generate a mono signal; -
converting the mono signal into a spectral representation; generating a first channel spectrum and a second channel spectrum from the spectral representation of the mono signal and the multichannel information; synthesis filtering the first channel spectrum to acquire a first channel signal and synthesis filtering the second channel spectrum to acquire a second channel signal, when said computer program is run by a computer.
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Specification