公开(公告)号：US11647333B2

公开(公告)日：2023-05-09

申请号：US17532962

申请日：2021-11-22

Applicant: DOLBY INTERNATIONAL AB

Inventor： Heiko Purnhagen ,  Lars Villemoes ,  Jonas Engdegard ,  Jonas Roeden ,  Kristofer Kjoerling

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

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 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：US10271142B2

公开(公告)日：2019-04-23

申请号：US15426867

申请日：2017-02-07

Applicant: DOLBY INTERNATIONAL AB

Inventor： Heiko Purnhagen ,  Lars Villemoes ,  Jonas Engdegard ,  Jonas Roeden ,  Kristofer Kjoerling

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

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：US09972328B2

公开(公告)日：2018-05-15

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 ,  G10L19/032 ,  G10L19/26 ,  G10L19/02 ,  H04S3/02

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：US12075224B2

公开(公告)日：2024-08-27

申请号：US18311854

申请日：2023-05-03

Applicant: DOLBY INTERNATIONAL AB

Inventor： Heiko Purnhagen ,  Lars Villemoes ,  Jonas Engdegard ,  Jonas Roeden ,  Kristofer Kjoerling

IPC: G10L19/08 ,  G10L19/008 ,  G10L19/02 ,  G10L19/032 ,  G10L19/16 ,  G10L19/26 ,  H04R5/00 ,  H04S3/02 ,  H04S5/00

CPC classification number: H04R5/00 ,  G10L19/008 ,  G10L19/0204 ,  G10L19/032 ,  G10L19/167 ,  G10L19/26 ,  H04S3/02 ,  H04S5/00 ,  H04S2400/01 ,  H04S2400/03 ,  H04S2420/03

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：US10250985B2

公开(公告)日：2019-04-02

申请号：US15498389

申请日：2017-04-26

Applicant: DOLBY INTERNATIONAL AB

Inventor： Heiko Purnhagen ,  Lars Villemoes ,  Jonas Engdegard ,  Jonas Roeden ,  Kristofer Kjoerling

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

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：US11184709B2

公开(公告)日：2021-11-23

申请号：US16846828

申请日：2020-04-13

Applicant: DOLBY INTERNATIONAL AB

Inventor： Heiko Purnhagen ,  Lars Villemoes ,  Jonas Engdegard ,  Jonas Roeden ,  Kristofer Kjoerling

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

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：US10440474B2

公开(公告)日：2019-10-08

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

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：US10250984B2

公开(公告)日：2019-04-02

申请号：US15498362

申请日：2017-04-26

Applicant: DOLBY INTERNATIONAL AB

Inventor： Heiko Purnhagen ,  Lars Villemoes ,  Jonas Engdegard ,  Jonas Roeden ,  Kristofer Kjoerling

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

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：US10244319B2

公开(公告)日：2019-03-26

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

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：US09972330B2

公开(公告)日：2018-05-15

申请号：US15498417

申请日：2017-04-26

Applicant: DOLBY INTERNATIONAL AB

Inventor： Heiko Purnhagen ,  Lars Villemoes ,  Jonas Engdegard ,  Jonas Roeden ,  Kristofer Kjoerling

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