公开(公告)号：US20250063197A1

公开(公告)日：2025-02-20

申请号：US18817659

申请日：2024-08-28

Applicant: DOLBY INTERNATIONAL AB

Inventor： Seung-Hwan Kim ,  Louis J. Kerofsky ,  Christopher A. Segall

IPC: H04N19/60 ,  H03M7/40 ,  H04N19/44 ,  H04N19/70 ,  H04N19/91

Abstract: A system utilizing a high throughput coding mode for CABAC in HEVC is described. The system may include an electronic device configured to obtain a block of data to be encoded using an arithmetic based encoder; to generate a sequence of syntax elements using the obtained block; to compare an Absolute-3 value of the sequence or a parameter associated with the Absolute-3 value to a preset value; and to convert the Absolute-3 value to a codeword using a first code or a second code that is different than the first code, according to a result of the comparison.

公开(公告)号：US20250054505A1

公开(公告)日：2025-02-13

申请号：US18905705

申请日：2024-10-03

Applicant: DOLBY INTERNATIONAL AB

Inventor： Per EKSTRAND ,  Lars VILLEMOES

IPC: G10L19/022 ,  G10L19/02 ,  G10L19/24 ,  G10L21/038 ,  G10L21/04

Abstract: The present invention relates to transposing signals in time and/or frequency and in particular to coding of audio signals. More particular, the present invention relates to high frequency reconstruction (HFR) methods including a frequency domain harmonic transposer. A method and system for generating a transposed output signal from an input signal using a transposition factor T is described. The system comprises an analysis window of length La, extracting a frame of the input signal, and an analysis transformation unit of order M transforming the samples into M complex coefficients. M is a function of the transposition factor T. The system further comprises a nonlinear processing unit altering the phase of the complex coefficients by using the transposition factor T, a synthesis transformation unit of order M transforming the altered coefficients into M altered samples, and a synthesis window of length Ls, generating a frame of the output signal.

公开(公告)号：US12219161B2

公开(公告)日：2025-02-04

申请号：US18515746

申请日：2023-11-21

Applicant: DOLBY INTERNATIONAL AB

Inventor： Sachin G. Deshpande

IPC: H04N19/31 ,  H04N1/31 ,  H04N19/172 ,  H04N21/2343 ,  H04N21/235

Abstract: An electronic device for encoding a picture is described. The electronic device includes a processor and instructions stored in memory that are in electronic communication with the processor. The instructions are executable to encode a step-wise temporal sub-layer access (STSA) sample grouping. The instructions are further executable to send and/or store the STSA sample grouping.

公开(公告)号：US20250037688A1

公开(公告)日：2025-01-30

申请号：US18912309

申请日：2024-10-10

Applicant: DOLBY INTERNATIONAL AB

Inventor： Per EKSTRAND ,  Lars VILLEMOES ,  Per HEDELIN

IPC: G10H1/00 ,  G10H1/12 ,  G10L19/26 ,  G10L21/038 ,  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：US12213004B2

公开(公告)日：2025-01-28

申请号：US18503083

申请日：2023-11-06

Applicant: Dolby International AB

Inventor： Heiko Purnhagen ,  Per Ekstrand

IPC: H04W28/06 ,  G10L19/008 ,  G10L19/035 ,  G10L19/038 ,  H03M7/30 ,  H04S1/00 ,  H04W28/02

Abstract: The present disclosure provides methods, devices and computer program products for non-uniform quantization of parameters. The disclosure further relates to a method and apparatus for reconstructing an audio object in an audio decoding system taking the non-uniformly quantized parameters into account. According to the disclosure, such an approach renders it possible to reduce bit consumption without substantially reducing the quality of the reconstructed audio object.

公开(公告)号：US12191834B2

公开(公告)日：2025-01-07

申请号：US17921279

申请日：2021-05-17

Applicant: DOLBY INTERNATIONAL AB

Inventor： Stanislaw Gorlow ,  Robin Thesing

IPC: H03G9/02 ,  H03G7/00

Abstract: A dynamic range control unit (210) configured to apply dynamic range control, referred to as DRC, to an audio signal (211). The DRC unit (210) is configured to downsample a subband signal (212) derived from the audio signal (211), to provide a downsampled subband signal (321), to determine a DRC gain (329) based on the downsampled subband signal (321), and to apply the DRC gain (329) to the subband signal (212), to provide a compressed subband signal (213) of a compressed audio signal (214).

公开(公告)号：US12185077B2

公开(公告)日：2024-12-31

申请号：US18084447

申请日：2022-12-19

Applicant: Dolby Laboratories Licensing Corporation ,  DOLBY INTERNATIONAL AB

Inventor： Michael C. Ward ,  Jeffrey Riedmiller ,  Scott Gregory Norcross ,  Alexander Stahlmann

IPC: H04S7/00 ,  G10L19/008 ,  G10L21/0324 ,  H04S1/00

Abstract: Audio content coded for a reference speaker configuration is downmixed to downmix audio content coded for a specific speaker configuration. One or more gain adjustments are performed on individual portions of the downmix audio content coded for the specific speaker configuration. Loudness measurements are then performed on the individual portions of the downmix audio content. An audio signal that comprises the audio content coded for the reference speaker configuration and downmix loudness metadata is generated. The downmix loudness metadata is created based at least in part on the loudness measurements on the individual portions of the downmix audio content.

公开(公告)号：US20240428815A1

公开(公告)日：2024-12-26

申请号：US18820818

申请日：2024-08-30

Applicant: Dolby Laboratories Licensing Corporation ,  DOLBY INTERNATIONAL AB

Inventor： Jeroen KOPPENS ,  Scott Gregory NORCROSS

IPC: G10L19/16 ,  G10L19/24 ,  G10L21/034

Abstract: This disclosure falls into the field of audio coding, in particular it is related to the field of providing a framework for providing loudness consistency among differing audio output signals. In particular, the disclosure relates to methods, computer program products and apparatus for encoding and decoding of audio data bitstreams in order to attain a desired loudness level of an output audio signal.

公开(公告)号：US12175992B2

公开(公告)日：2024-12-24

申请号：US18355168

申请日：2023-07-19

Applicant: DOLBY LABORATORIES LICENSING CORPORATION ,  DOLBY INTERNATIONAL AB

Inventor： Jeffrey Riedmiller ,  Karl J. Roeden ,  Kristofer Kjoerling ,  Heiko Purnhagen ,  Vinay Melkote ,  Leif Sehlstrom

IPC: G10L19/24 ,  E21B21/00 ,  E21B33/138 ,  E21B41/00 ,  G10L19/008 ,  G10L19/16 ,  G10L19/18

Abstract: On the basis of a bitstream (P), an n-channel audio signal (X) is reconstructed by deriving an m-channel core signal (Y) and multichannel coding parameters (α) from the bitstream, where 1≤m

公开(公告)号：US20240406399A1

公开(公告)日：2024-12-05

申请号：US18649856

申请日：2024-04-29

Applicant: DOLBY INTERNATIONAL AB

Inventor： Louis J. Kerofsky ,  Kiran Misra ,  Christopher A. Segall

IPC: H04N19/132 ,  H04N19/176 ,  H04N19/182 ,  H04N19/184 ,  H04N19/44

Abstract: A method for decoding video includes receiving quantized coefficients representative of a block of video representative of a plurality of pixels. The quantized coefficients are dequantized based upon a function of a remainder. The dequantized coefficients are inverse transformed to determine a decoded residue.