公开(公告)号：US20230162748A1

公开(公告)日：2023-05-25

申请号：US18157644

申请日：2023-01-20

Applicant: DOLBY INTERNATIONAL AB

Inventor： Kristofer KJOERLING ,  Lars VILLEMOES ,  Heiko PURNHAGEN ,  Per EKSTRAND

IPC: G10L19/18 ,  G10L21/038

CPC classification number: G10L19/18 ,  G10L21/038

Abstract: A method for decoding an encoded audio bitstream is disclosed. The method includes receiving the encoded audio bitstream and decoding the audio data to generate a decoded lowband audio signal. The method further includes extracting high frequency reconstruction metadata and filtering the decoded lowband audio signal with an analysis filterbank to generate a filtered lowband audio signal. The method also includes extracting a flag indicating whether either spectral translation or harmonic transposition is to be performed on the audio data and regenerating a highband portion of the audio signal using the filtered lowband audio signal and the high frequency reconstruction metadata in accordance with the flag. The high frequency regeneration is performed as a post-processing operation with a delay of 3010 samples per audio channel.

公开(公告)号：US11657788B2

公开(公告)日：2023-05-23

申请号：US17549661

申请日：2021-12-13

Applicant: Dolby International AB

Inventor： Per Ekstrand ,  Lars Villemoes ,  Per Hedelin

IPC: G10L21/038 ,  G10H1/00 ,  G10L19/26 ,  G10H1/12 ,  G10L21/0388

CPC classification number: G10H1/0091 ,  G10H1/125 ,  G10L19/265 ,  G10L21/038 ,  G10H2210/311 ,  G10L21/0388

Abstract: The present document relates to audio coding systems which make use of a harmonic transposition method for high frequency reconstruction (HFR), and to digital effect processors, e.g. so-called exciters, where generation of harmonic distortion adds brightness to the processed signal. In particular, a system configured to generate a high frequency component of a signal from a low frequency component of the signal is described. The system may comprise an analysis filter bank (501) configured to provide a set of analysis subband signals from the low frequency component of the signal; wherein the set of analysis subband signals comprises at least two analysis subband signals; wherein the analysis filter bank (501) has a frequency resolution of Δf. The system further comprises a nonlinear processing unit (502) configured to determine a set of synthesis subband signals from the set of analysis subband signals using a transposition order P; wherein the set of synthesis subband signals comprises a portion of the set of analysis subband signals phase shifted by an amount derived from the transposition order P; and a synthesis filter bank (504) configured to generate the high frequency component of the signal from the set of synthesis subband signals; wherein the synthesis filter bank (504) has a frequency resolution of FΔf; with F being a resolution factor, with F≥1; wherein the transposition order P is different from the resolution factor F.

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：US11641560B2

公开(公告)日：2023-05-02

申请号：US17465733

申请日：2021-09-02

Applicant: Dolby Laboratories Licensing Corporation ,  Dolby International AB

Inventor： Leif Jonas Samuelsson ,  Dirk Jeroen Breebaart ,  David Matthew Cooper ,  Jeroen Koppens

IPC: H04S1/00 ,  H04S3/00 ,  H04S7/00 ,  H04S3/02 ,  H04R5/04

Abstract: Methods for dialogue enhancing audio content, comprising providing a first audio signal presentation of the audio components, providing a second audio signal presentation, receiving a set of dialogue estimation parameters configured to enable estimation of dialogue components from the first audio signal presentation, applying said set of dialogue estimation parameters to said first audio signal presentation, to form a dialogue presentation of the dialogue components; and combining the dialogue presentation with said second audio signal presentation to form a dialogue enhanced audio signal presentation for reproduction on the second audio reproduction system, wherein at least one of said first and second audio signal presentation is a binaural audio signal presentation.

公开(公告)号：US11626120B2

公开(公告)日：2023-04-11

申请号：US17973387

申请日：2022-10-25

Applicant: DOLBY INTERNATIONAL AB

Inventor： Kristofer Kjoerling ,  Lars Villemoes ,  Heiko Purnhagen ,  Per Ekstrand

IPC: G10L19/02 ,  G10L19/16 ,  G10L19/26 ,  H03M7/30

Abstract: A method for decoding an encoded audio bitstream is disclosed. The method includes receiving the encoded audio bitstream and decoding the audio data to generate a decoded lowband audio signal. The method further includes extracting high frequency reconstruction metadata and filtering the decoded lowband audio signal with an analysis filterbank to generate a filtered lowband audio signal. The method also includes extracting a flag indicating whether either spectral translation or harmonic transposition is to be performed on the audio data and regenerating a highband portion of the audio signal using the filtered lowband audio signal and the high frequency reconstruction metadata in accordance with the flag.

公开(公告)号：US20230087552A1

公开(公告)日：2023-03-23

申请号：US17987545

申请日：2022-11-15

Applicant: Dolby International AB

Inventor： Kristofer KJOERLING ,  Lars VILLEMOES ,  Heiko PURNHAGEN ,  Per EKSTRAND

IPC: G10L21/0388 ,  G10L19/008 ,  G10L19/02 ,  H04S3/00

Abstract: A method for decoding an encoded audio bitstream is disclosed. The method includes receiving the encoded audio bitstream and decoding the audio data to generate a decoded lowband audio signal. The method further includes extracting high frequency reconstruction metadata and filtering the decoded lowband audio signal with an analysis filterbank to generate a filtered lowband audio signal. The method also includes extracting a flag indicating whether either spectral translation or harmonic transposition is to be performed on the audio data and regenerating a highband portion of the audio signal using the filtered lowband audio signal and the high frequency reconstruction metadata in accordance with the flag. The high frequency regeneration is performed as a post-processing operation with a delay of 3010 samples per audio channel.

公开(公告)号：US11605391B2

公开(公告)日：2023-03-14

申请号：US17963767

申请日：2022-10-11

Applicant: DOLBY INTERNATIONAL AB

Inventor： Lars Villemoes ,  Heiko Purnhagen ,  Per Ekstrand

IPC: G10L19/00 ,  G10L19/26 ,  G10L19/008 ,  G10L19/24

Abstract: A method for decoding an encoded audio bitstream is disclosed. The method includes receiving the encoded audio bitstream and decoding the audio data to generate a decoded lowband audio signal. The method further includes extracting high frequency reconstruction metadata and filtering the decoded lowband audio signal with an analysis filterbank to generate a filtered lowband audio signal. The method also includes extracting a flag indicating whether either spectral translation or harmonic transposition is to be performed on the audio data and regenerating a highband portion of the audio signal using the filtered lowband audio signal and the high frequency reconstruction metadata in accordance with the flag.

公开(公告)号：US20230075445A1

公开(公告)日：2023-03-09

申请号：US17898358

申请日：2022-08-29

Applicant: DOLBY LABORATORIES LICENSING CORPORATION ,  DOLBY INTERNATIONAL AB

Inventor： Jeroen Koppens ,  Jeffrey Riedmiller ,  Kristofer Kjoerling ,  Alexander Stahlmann ,  Holger Hoerich ,  Alan J. Seefeldt

IPC: G06F3/16 ,  H04S7/00 ,  H03G3/30 ,  G10L19/16 ,  H03G9/18 ,  H03G9/00 ,  H03G7/00 ,  G10L21/0324 ,  H03G9/02 ,  H04S1/00 ,  H03G9/12

Abstract: In an audio encoder, for audio content received in a source audio format, default gains are generated based on a default dynamic range compression (DRC) curve, and non-default gains are generated for a non-default gain profile. Based on the default gains and non-default gains, differential gains are generated. An audio signal comprising the audio content, the default DRC curve, and differential gains is generated. In an audio decoder, the default DRC curve and the differential gains are identified from the audio signal. Default gains are re-generated based on the default DRC curve. Based on the combination of the re-generated default gains and the differential gains, operations are performed on the audio content extracted from the audio signal.

公开(公告)号：US20230065644A1

公开(公告)日：2023-03-02

申请号：US17896005

申请日：2022-08-25

Applicant: DOLBY INTERNATIONAL AB

Inventor： Leon TERENTIV ,  Christof FERSCH ,  Daniel FISCHER

IPC: H04S7/00 ,  G10L19/008 ,  G10L19/16 ,  H04S3/00

Abstract: The present disclosure relates to methods, apparatus and systems for encoding an audio signal into a bitstream, in particular at an encoder, comprising: encoding or including audio signal data associated with 3DoF audio rendering into one or more first bitstream parts of the bitstream, and encoding or including metadata associated with 6DoF audio rendering into one or more second bitstream parts of the bitstream. The present disclosure further relates to methods, apparatus and systems for decoding an audio signal and audio rendering based on the bitstream.

公开(公告)号：US20230059063A1

公开(公告)日：2023-02-23

申请号：US17797569

申请日：2021-02-01

Applicant: Dolby International AB

Inventor： Jonas Moeller Larsen

IPC: H04N21/4402 ,  H04N21/845

Abstract: Described herein is a method for controlling media data playout on a client device, wherein the method includes the steps of: (a) retrieving, by the client device, media data comprising a plurality of segments subdivided into one or more chunks for playout from at least one media server; (b) analyzing a current chunk of the one or more chunks of a current segment; and (c) adapting the playout of the media data in response to the result of the analysis prior to fully retrieving the current chunk. Described herein are further a client device having implemented a media player application configured to perform said method and a computer program product with instructions adapted to cause a device having processing capability to carry out said method.