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公开(公告)号：US10553226B2
公开(公告)日：2020-02-04
申请号：US16449942
申请日：2019-06-24
Applicant: DOLBY INTERNATIONAL AB
Inventor： Heiko Purnhagen , Pontus Carlsson , Lars Villemoes
Abstract: The invention provides methods and apparatuses for encoding a stereo audio signal having a left channel and a right channel. The apparatus includes a prediction coefficient estimator, downmixer, and multiplexer. The encoder is configured operate either in a prediction mode or a non-prediction mode.
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公开(公告)号：US20190287539A1
公开(公告)日：2019-09-19
申请号：US16427735
申请日：2019-05-31
Applicant: DOLBY INTERNATIONAL AB
Inventor： Heiko Purnhagen , Pontus Carlsson , Lars Villemoes
IPC: G10L19/008 , G10L19/16 , H04S3/00 , G10L19/06 , G10L19/02
Abstract: The invention provides methods and devices for outputting a stereo audio signal having a left channel and a right channel. The apparatus includes a demultiplexer, decoder, and upmixer. The upmixer is configured operate either in a prediction mode or a non-prediction mode based on a parameter encoded in the audio bitstream.
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公开(公告)号：US20190279648A1
公开(公告)日：2019-09-12
申请号：US16424395
申请日：2019-05-28
Applicant: Dolby International AB
Inventor： Heiko Purnhagen , Lars Villemoes , Pontus Carlsson
IPC: G10L19/008 , G10L19/16 , H04S3/00 , G10L19/06 , G10L19/02
Abstract: The invention provides methods and devices for stereo encoding and decoding using complex prediction in the frequency domain. In one embodiment, a decoding method, for obtaining an output stereo signal from an input stereo signal encoded by complex prediction coding and comprising first frequency-domain representations of two input channels, comprises the upmixing steps of: (i) computing a second frequency-domain representation of a first input channel; and (ii) computing an output channel on the basis of the first and second frequency-domain representations of the first input channel, the first frequency-domain representation of the second input channel and a complex prediction coefficient. The upmixing can be suspended responsive to control data.
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公开(公告)号：US09905230B2
公开(公告)日：2018-02-27
申请号：US14734088
申请日：2015-06-09
Applicant: Dolby International AB
Inventor： Heiko Purnhagen , Pontus Carlsson , Kristofer Kjoerling
IPC: G10L19/002 , H04S5/02 , H04S5/00 , H04S3/02 , G10L19/008 , G10L19/18
CPC classification number: G10L19/002 , G10L19/008 , G10L19/18 , H04S3/02 , H04S5/00 , H04S5/005 , H04S5/02 , H04S2400/01 , H04S2400/03 , H04S2420/03
Abstract: The application relates to audio encoder and decoder systems. An embodiment of the encoder system comprises a downmix stage for generating a downmix signal and a residual signal based on a stereo signal. In addition, the encoder system comprises a parameter determining stage for determining parametric stereo parameters such as an inter-channel intensity difference and an inter-channel cross-correlation. Preferably, the parametric stereo parameters are time- and frequency-variant. Moreover, the encoder system comprises a transform stage. The transform stage generates a pseudo left/right stereo signal by performing a transform based on the downmix signal and the residual signal. The pseudo stereo signal is processed by a perceptual stereo encoder. For stereo encoding, left/right encoding or mid/side encoding is selectable. Preferably, the selection between left/right stereo encoding and mid/side stereo encoding is time- and frequency-variant.
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公开(公告)号：US20220180876A1
公开(公告)日：2022-06-09
申请号：US17560295
申请日：2021-12-23
Applicant: DOLBY INTERNATIONAL AB
Inventor： Heiko Purnhagen , Pontus Carlsson , Lars Villemoes
Abstract: The invention provides methods and devices for stereo encoding and decoding using complex prediction in the frequency domain. In one embodiment, a decoding method, for obtaining an output stereo signal from an input stereo signal encoded by complex prediction coding and comprising first frequency-domain representations of two input channels, comprises the upmixing steps of: (i) computing a second frequency-domain representation of a first input channel; and (ii) computing an output channel on the basis of the first and second frequency-domain representations of the first input channel, the first frequency-domain representation of the second input channel and a complex prediction coefficient. The upmixing can be suspended responsive to control data.
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Patent Agency Ranking
公开(公告)号：US11322161B2
公开(公告)日：2022-05-03
申请号：US16456476
申请日：2019-06-28
Applicant: Dolby International AB
Inventor： Heiko Purnhagen , Pontus Carlsson , Kristofer Kjoerling
IPC: G10L19/002 , H04S5/02 , H04S5/00 , H04S3/02 , G10L19/008 , G10L19/18
Abstract: Methods and systems encoding a stereo audio signal having an original left channel and an original right channel are disclosed. The method includes generating a downmix signal and a residual signal based on the stereo audio signal and determining one or more stereo parameters based on the stereo audio signal. The residual signal covers only a part of an audio frequency range of the stereo signal, and the one or more stereo parameters describing a stereo image of the stereo audio signal. The method further includes analyzing the stereo audio signal and selecting, based on the analyzing, left/right perceptual encoding or mid/side perceptual encoding in a time variant manner.
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公开(公告)号：US11264038B2
公开(公告)日：2022-03-01
申请号：US16796150
申请日：2020-02-20
Applicant: Dolby International AB
Inventor： Heiko Purnhagen , Lars Villemoes , Pontus Carlsson
Abstract: The invention provides methods and devices for stereo encoding and decoding using complex prediction in the frequency domain. In one embodiment, a decoding method, for obtaining an output stereo signal from an input stereo signal encoded by complex prediction coding and comprising first frequency-domain representations of two input channels, comprises the upmixing steps of:
(i) computing a second frequency-domain representation of a first input channel; and
(ii) computing an output channel on the basis of the first and second frequency-domain representations of the first input channel, the first frequency-domain representation of the second input channel and a complex prediction coefficient. The upmixing can be suspended responsive to control data.-
公开(公告)号：US10796703B2
公开(公告)日：2020-10-06
申请号：US16558634
申请日：2019-09-03
Applicant: Dolby International AB
Inventor： Heiko Purnhagen , Pontus Carlsson , Kristofer Kjoerling
IPC: G10L19/002 , H04S5/00 , H04S3/02 , G10L19/008 , G10L19/18 , H04S5/02
Abstract: Methods and systems encoding a stereo audio signal having a left channel and a right channel are disclosed. The system includes a downmixer for generating a downmix signal and a residual signal from the stereo audio signal in selected frequency bands representing only part of a used audio frequency range of the stereo audio signal, and a decision module for selecting, in a time variant manner, either left/right perceptual encoding or mid/side perceptual encoding. The system also includes a parameter estimator for estimating stereo parameters for reconstructing a stereo image of a portion of the stereo audio signal, and a perceptual encoder for performing either left/right perceptual encoding or mid/side perceptual encoding based on the selecting to generate an encoded output signal. Finally, the system includes a bitstream generator for creating a bitstream signal comprising the encoded output signal.
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公开(公告)号：US10734002B2
公开(公告)日：2020-08-04
申请号：US16593235
申请日：2019-10-04
Applicant: DOLBY INTERNATIONAL AB
Inventor： Heiko Purnhagen , Pontus Carlsson , Lars Villemoes
Abstract: The invention provides methods and devices for outputting a stereo audio signal having a left channel and a right channel. The apparatus includes a demultiplexer, decoder, and upmixer. The upmixer is configured operate either in a prediction mode or a non-prediction mode based on a parameter encoded in the audio bitstream.
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公开(公告)号：US10586545B2
公开(公告)日：2020-03-10
申请号：US16424395
申请日：2019-05-28
Applicant: Dolby International AB
Inventor： Heiko Purnhagen , Lars Villemoes , Pontus Carlsson
Abstract: The invention provides methods and devices for stereo encoding and decoding using complex prediction in the frequency domain. In one embodiment, a decoding method, for obtaining an output stereo signal from an input stereo signal encoded by complex prediction coding and comprising first frequency-domain representations of two input channels, comprises the upmixing steps of: (i) computing a second frequency-domain representation of a first input channel; and (ii) computing an output channel on the basis of the first and second frequency-domain representations of the first input channel, the first frequency-domain representation of the second input channel and a complex prediction coefficient. The upmixing can be suspended responsive to control data.
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