公开(公告)号：US20200227053A1

公开(公告)日：2020-07-16

申请号：US16744586

申请日：2020-01-16

Applicant: DOLBY INTERNATIONAL AB

Inventor： Fredrik HENN ,  Kristofer KJORLING ,  Lars LILJERYD ,  Jonas RODEN ,  Jonas ENGDEGARD

IPC: G10L19/008 ,  G10L21/038 ,  G10L19/26 ,  G10L25/21

Abstract: The present invention provides improvements to prior art audio codecs that generate a stereo-illusion through post-processing of a received mono signal. These improvements are accomplished by extraction of stereo-image describing parameters at the encoder side, which are transmitted and subsequently used for control of a stereo generator at the decoder side. Furthermore, the invention bridges the gap between simple pseudo-stereo methods, and current methods of true stereo-coding, by using a new form of parametric stereo coding. A stereo-balance parameter is introduced, which enables more advanced stereo modes, and in addition forms the basis of a new method of stereo-coding of spectral envelopes, of particular use in systems where guided HFR (High Frequency Reconstruction) is employed. As a special case, the application of this stereo-coding scheme in scalable HFR-based codecs is described.

公开(公告)号：US20180033441A1

公开(公告)日：2018-02-01

申请号：US15730652

申请日：2017-10-11

Applicant: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V. ,  Dolby International AB

Inventor： Juergen HERRE ,  Johannes HILPERT ,  Andreas HOELZER ,  Jonas ENGDEGARD ,  Heiko PURNHAGEN

IPC: G10L19/008 ,  G10L19/20 ,  G10L19/005 ,  H04S3/02 ,  H04S5/00

Abstract: An audio signal decoder for providing an upmix signal representation on the basis of a downmix signal representation and an object-related parametric information and in dependence on a rendering information has an object parameter determinator. The object parameter determinator is configured to obtain inter-object-correlation values for a plurality of pairs of audio objects. The object parameter determinator is configured to evaluate a bitstream signaling parameter in order to decide whether to evaluate individual inter-object-correlation bitstream parameter values to obtain inter-object-correlation values for a plurality of pairs of related audio objects, or to obtain inter-object-correlation values for a plurality of pairs of related audio objects using a common inter-object-correlation bitstream parameter value. The audio signal decoder also has a signal processor configured to obtain the upmix signal representation on the basis of the downmix signal representation and using the inter-object-correlation values for a plurality of pairs of related objects and the rendering information.

公开(公告)号：US20170238112A1

公开(公告)日：2017-08-17

申请号：US15498376

申请日：2017-04-26

Applicant: DOLBY INTERNATIONAL AB

Inventor： Heiko PURNHAGEN ,  Lars VILLEMOES ,  Jonas ENGDEGARD ,  Jonas ROEDEN ,  Kristofer KJOERLING

IPC: H04S5/00 ,  G10L19/16 ,  G10L19/02 ,  G10L19/008

CPC classification number: H04R5/00 ,  G10L19/008 ,  G10L19/0204 ,  G10L19/032 ,  G10L19/167 ,  G10L19/26 ,  H04S3/02 ,  H04S5/00 ,  H04S2400/01 ,  H04S2400/03

Abstract: A method performed by an audio decoder for reconstructing N audio channels from an audio signal containing M audio channels is disclosed. The method includes receiving a bitstream containing an encoded audio signal having M audio channels and a set of spatial parameters, the set of spatial parameters including an inter-channel intensity difference parameter and an inter-channel coherence parameter. The encoded audio bitstream is then decoded to obtain a decoded frequency domain representation of the M audio channels, and at least a portion of the frequency domain representation is decorrelated with an all-pass filter having a fractional delay. The all-pass filter is attenuated at locations of a transient. A matrixed version of the decorrelated signals are summed with a matrixed version of the decoded frequency domain representation to obtain N audio signals that collectively having N audio channels where M is less than N.

公开(公告)号：US20170229129A1

公开(公告)日：2017-08-10

申请号：US15498401

申请日：2017-04-26

Applicant: DOLBY INTERNATIONAL AB

Inventor： Heiko PURNHAGEN ,  Lars VILLEMOES ,  Jonas ENGDEGARD ,  Jonas ROEDEN ,  Kristofer KJOERLING

IPC: G10L19/008 ,  H04S3/02 ,  G10L19/02 ,  G10L19/26 ,  G10L19/032

CPC classification number: H04R5/00 ,  G10L19/008 ,  G10L19/0204 ,  G10L19/032 ,  G10L19/167 ,  G10L19/26 ,  H04S3/02 ,  H04S5/00 ,  H04S2400/01 ,  H04S2400/03

Abstract: A method performed by an audio decoder for reconstructing N audio channels from an audio signal containing M audio channels is disclosed. The method includes receiving a bitstream containing an encoded audio signal having M audio channels and a set of spatial parameters, the set of spatial parameters including an inter-channel intensity difference parameter and an inter-channel coherence parameter. The encoded audio bitstream is then decoded to obtain a decoded frequency domain representation of the M audio channels, and at least a portion of the frequency domain representation is decorrelated with an all-pass filter having a fractional delay. The all-pass filter is attenuated at locations of a transient. A matrixed version of the decorrelated signals are summed with a matrixed version of the decoded frequency domain representation to obtain N audio signals that collectively having N audio channels where M is less than N.

公开(公告)号：US20170084285A1

公开(公告)日：2017-03-23

申请号：US15344170

申请日：2016-11-04

Applicant: Dolby International AB

Inventor： Jonas ENGDEGARD ,  Lars VILLEMOES ,  Heiko PURNHAGEN ,  Barbara RESCH

IPC: G10L19/20 ,  H04S3/00 ,  G10L19/008 ,  H04S3/02

CPC classification number: G10L19/20 ,  G10L19/008 ,  H04S3/008 ,  H04S3/02 ,  H04S5/00 ,  H04S7/30 ,  H04S2400/03 ,  H04S2400/11 ,  H04S2420/03

Abstract: An audio object coder for generating an encoded object signal using a plurality of audio objects includes a downmix information generator for generating downmix information indicating a distribution of the plurality of audio objects into at least two downmix channels, an audio object parameter generator for generating object parameters for the audio objects, and an output interface for generating the imported audio output signal using the downmix information and the object parameters. An audio synthesizer uses the downmix information for generating output data usable for creating a plurality of output channels of the predefined audio output configuration.

公开(公告)号：US20190320263A1

公开(公告)日：2019-10-17

申请号：US16454250

申请日：2019-06-27

Applicant: DOLBY INTERNATIONAL AB

Inventor： Heiko PURNHAGEN ,  Lars VILLEMOES ,  Jonas ENGDEGARD ,  Jonas ROEDEN ,  Kristofer KJOERLING

IPC: H04R5/00 ,  H04S5/00 ,  G10L19/16 ,  G10L19/008 ,  G10L19/032 ,  G10L19/26 ,  H04S3/02 ,  G10L19/02

Abstract: A method and apparatus for reconstructing N audio channels from M audio channels is disclosed. The method includes receiving a bitstream containing an encoded audio signal representing the M audio channels and decoding the encoded audio signal to obtain a frequency domain representation of the M audio channels. The method further includes extracting a parameter from the bitstream and reconstructing at least one of the N audio channels using the parameter. The parameter represents an angle between two signals, at least one of which is included in the M audio channels.

公开(公告)号：US20170238113A1

公开(公告)日：2017-08-17

申请号：US15498393

申请日：2017-04-26

Applicant: DOLBY INTERNATIONAL AB

Inventor： Heiko PURNHAGEN ,  Lars VILLEMOES ,  Jonas ENGDEGARD ,  Jonas ROEDEN ,  Kristofer KJOERLING

IPC: H04S5/00 ,  G10L19/02 ,  G10L19/26 ,  G10L19/008 ,  G10L19/16

CPC classification number: H04R5/00 ,  G10L19/008 ,  G10L19/0204 ,  G10L19/032 ,  G10L19/167 ,  G10L19/26 ,  H04S3/02 ,  H04S5/00 ,  H04S2400/01 ,  H04S2400/03

Abstract: A method performed by an audio decoder for reconstructing N audio channels from an audio signal containing M audio channels is disclosed. The method includes receiving a bitstream containing an encoded audio signal having M audio channels and a set of spatial parameters, the set of spatial parameters including an inter-channel intensity difference parameter and an inter-channel coherence parameter. The encoded audio bitstream is then decoded to obtain a decoded frequency domain representation of the M audio channels, and at least a portion of the frequency domain representation is decorrelated with an all-pass filter having a fractional delay. The all-pass filter is attenuated at locations of a transient. A matrixed version of the decorrelated signals are summed with a matrixed version of the decoded frequency domain representation to obtain N audio signals that collectively having N audio channels where M is less than N.

公开(公告)号：US20170229126A1

公开(公告)日：2017-08-10

申请号：US15498350

申请日：2017-04-26

Applicant: DOLBY INTERNATIONAL AB

Inventor： Heiko PURNHAGEN ,  Lars VILLEMOES ,  Jonas ENGDEGARD ,  Jonas ROEDEN ,  Kristofer KJOERLING

IPC: G10L19/008 ,  H04S5/00 ,  G10L19/02 ,  G10L19/16

CPC classification number: H04R5/00 ,  G10L19/008 ,  G10L19/0204 ,  G10L19/032 ,  G10L19/167 ,  G10L19/26 ,  H04S3/02 ,  H04S5/00 ,  H04S2400/01 ,  H04S2400/03

Abstract: A method performed by an audio decoder for reconstructing N audio channels from an audio signal containing M audio channels is disclosed. The method includes receiving a bitstream containing an encoded audio signal having M audio channels and a set of spatial parameters, the set of spatial parameters including an inter-channel intensity difference parameter and an inter-channel coherence parameter. The encoded audio bitstream is then decoded to obtain a decoded frequency domain representation of the M audio channels, and at least a portion of the frequency domain representation is decorrelated with an all-pass filter having a fractional delay. The all-pass filter is attenuated at locations of a transient. A matrixed version of the decorrelated signals are summed with a matrixed version of the decoded frequency domain representation to obtain N audio signals that collectively having N audio channels where M is less than N.

公开(公告)号：US20170229131A1

公开(公告)日：2017-08-10

申请号：US15498413

申请日：2017-04-26

Applicant: DOLBY INTERNATIONAL AB

Inventor： Heiko PURNHAGEN ,  Lars VILLEMOES ,  Jonas ENGDEGARD ,  Jonas ROEDEN ,  Kristofer KJOERLING

IPC: G10L19/008 ,  H04S3/02 ,  G10L19/02 ,  G10L19/26 ,  G10L19/032

CPC classification number: H04R5/00 ,  G10L19/008 ,  G10L19/0204 ,  G10L19/032 ,  G10L19/167 ,  G10L19/26 ,  H04S3/02 ,  H04S5/00 ,  H04S2400/01 ,  H04S2400/03

Abstract: A method performed by an audio decoder for reconstructing N audio channels from an audio signal containing M audio channels is disclosed. The method includes receiving a bitstream containing an encoded audio signal having M audio channels and a set of spatial parameters, the set of spatial parameters including an inter-channel intensity difference parameter and an inter-channel coherence parameter. The encoded audio bitstream is then decoded to obtain a decoded frequency domain representation of the M audio channels, and at least a portion of the frequency domain representation is decorrelated with an all-pass filter having a fractional delay. The all-pass filter is attenuated at locations of a transient. A matrixed version of the decorrelated signals are summed with a matrixed version of the decoded frequency domain representation to obtain N audio signals that collectively having N audio channels where M is less than N.

公开(公告)号：US20150356977A1

公开(公告)日：2015-12-10

申请号：US14826942

申请日：2015-08-14

Applicant: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V. ,  Dolby International AB

Inventor： Juergen HERRE ,  Johannes HILPERT ,  Andreas HOELZER ,  Jonas ENGDEGARD ,  Heiko PURNHAGEN

IPC: G10L19/008

CPC classification number: G10L19/008 ,  G10L19/005 ,  G10L19/20 ,  H04S3/02 ,  H04S5/005 ,  H04S2420/03

Abstract: An audio signal decoder for providing an upmix signal representation on the basis of a downmix signal representation and an object-related parametric information and in dependence on a rendering information has an object parameter determinator. The object parameter determinator is configured to obtain inter-object-correlation values for a plurality of pairs of audio objects. The object parameter determinator is configured to evaluate a bitstream signaling parameter in order to decide whether to evaluate individual inter-object-correlation bitstream parameter values to obtain inter-object-correlation values for a plurality of pairs of related audio objects, or to obtain inter-object-correlation values for a plurality of pairs of related audio objects using a common inter-object-correlation bitstream parameter value. The audio signal decoder also has a signal processor configured to obtain the upmix signal representation on the basis of the downmix signal representation and using the inter-object-correlation values for a plurality of pairs of related objects and the rendering information.