公开(公告)号：US20250118312A1

公开(公告)日：2025-04-10

申请号：US18982478

申请日：2024-12-16

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：US20250118311A1

公开(公告)日：2025-04-10

申请号：US18982382

申请日：2024-12-16

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：US12170712B2

公开(公告)日：2024-12-17

申请号：US17976705

申请日：2022-10-28

Applicant: DOLBY LABORATORIES LICENSING CORPORATION ,  DOLBY INTERNATIONAL AB

Inventor： Jason Michael Cloud ,  Jeffrey Riedmiller ,  Kristofer Kjoerling ,  Janusz Klejsa

IPC: H04L67/565 ,  H04L65/60 ,  H04L65/75 ,  H04L67/568 ,  H04N21/2343 ,  H04N21/24 ,  H04N21/2662 ,  H04N21/845

Abstract: A method for providing media content within a media distribution network. The method comprises transforming source media content into an interim format, thereby providing transformed content. Furthermore, the method comprises storing the transformed content on at least one core storage unit. In addition, the method comprises receiving a request for the source media content from a client. The method further comprises encoding the transformed content or intermediate coded content derived therefrom into encoded content suitable for transmission over a core network and/or an edge network, as well as sending the encoded content via the core network and/or the edge network to the client.

公开(公告)号：US20240282315A1

公开(公告)日：2024-08-22

申请号：US18653833

申请日：2024-05-02

Applicant: DOLBY INTERNATIONAL AB

Inventor： Kristofer Kjoerling

IPC: G10L19/00 ,  G10L19/02 ,  G10L21/038

CPC classification number: G10L19/0017 ,  G10L19/0204 ,  G10L21/038

Abstract: The application relates to HFR (High Frequency Reconstruction/Regeneration) of audio signals. In particular, the application relates to a method and system for performing HFR of audio signals having large variations in energy level across the low frequency range which is used to reconstruct the high frequencies of the audio signal. A system configured to generate a plurality of high frequency subband signals covering a high frequency interval from a plurality of low frequency subband signals is described. The system comprises means for receiving the plurality of low frequency subband signals; means for receiving a set of target energies, each target energy covering a different target interval within the high frequency interval and being indicative of the desired energy of one or more high frequency subband signals lying within the target interval; means for generating the plurality of high frequency subband signals from the plurality of low frequency subband signals and from a plurality of spectral gain coefficients associated with the plurality of low frequency subband signals, respectively; and means for adjusting the energy of the plurality of high frequency subband signals using the set of target energies.

公开(公告)号：US12002476B2

公开(公告)日：2024-06-04

申请号：US18145797

申请日：2022-12-22

Applicant: DOLBY INTERNATIONAL AB

Inventor： Kristofer Kjoerling

IPC: G10L21/038 ,  G10L19/00 ,  G10L19/02

CPC classification number: G10L19/0017 ,  G10L19/0204 ,  G10L21/038

Abstract: The application relates to HFR (High Frequency Reconstruction/Regeneration) of audio signals. In particular, the application relates to a method and system for performing HFR of audio signals having large variations in energy level across the low frequency range which is used to reconstruct the high frequencies of the audio signal. A system configured to generate a plurality of high frequency subband signals covering a high frequency interval from a plurality of low frequency subband signals is described. The system comprises means for receiving the plurality of low frequency subband signals; means for receiving a set of target energies, each target energy covering a different target interval within the high frequency interval and being indicative of the desired energy of one or more high frequency subband signals lying within the target interval; means for generating the plurality of high frequency subband signals from the plurality of low frequency subband signals and from a plurality of spectral gain coefficients associated with the plurality of low frequency subband signals, respectively; and means for adjusting the energy of the plurality of high frequency subband signals using the set of target energies.

公开(公告)号：US11961528B2

公开(公告)日：2024-04-16

申请号：US18357679

申请日：2023-07-24

Applicant: Dolby International AB

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

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

CPC classification number: G10L19/02 ,  G10L19/167 ,  G10L19/26 ,  H03M7/6005 ,  H03M7/6011

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：US11908486B2

公开(公告)日：2024-02-20

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：US11862185B2

公开(公告)日：2024-01-02

申请号：US18113418

申请日：2023-02-23

Applicant: Dolby International AB

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

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

CPC classification number: G10L21/0388 ,  G10L19/008 ,  G10L19/02 ,  H04S3/008

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：US11842122B2

公开(公告)日：2023-12-12

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

CPC classification number: G06F3/165 ,  G10L19/167 ,  G10L21/0324 ,  H03G3/3005 ,  H03G3/3089 ,  H03G7/002 ,  H03G7/007 ,  H03G9/005 ,  H03G9/025 ,  H03G9/12 ,  H03G9/18 ,  H04S1/00 ,  H04S7/30 ,  H04S2400/13

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：US11776552B2

公开(公告)日：2023-10-03

申请号：US17817399

申请日：2022-08-04

Applicant: DOLBY INTERNATIONAL AB

Inventor： Heiko Purnhagen ,  Harald Mundt ,  Kristofer Kjoerling

IPC: G10L19/008 ,  G10L19/02 ,  G10L19/24 ,  H04S5/00

CPC classification number: G10L19/008 ,  G10L19/02 ,  G10L19/24 ,  H04S5/00 ,  H04S2400/03 ,  H04S2420/03

Abstract: There are provided decoding and encoding methods for encoding and decoding of multichannel audio content for playback on a speaker configuration with N channels. The decoding method comprises decoding, in a first decoding module, M input audio signals into M mid signals which are suitable for playback on a speaker configuration with M channels; and for each of the N channels in excess of M channels, receiving an additional input audio signal corresponding to one of the M mid signals and decoding the input audio signal and its corresponding mid signal so as to generate a stereo signal including a first and a second audio signal which are suitable for playback on two of the N channels of the speaker configuration.