公开(公告)号：US20240212692A1

公开(公告)日：2024-06-27

申请号：US18390897

申请日：2023-12-20

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Sven KORDON ,  Alexander KRUEGER

IPC: G10L19/008 ,  H04S7/00

CPC classification number: G10L19/008 ,  H04S7/30 ,  H04S2400/11 ,  H04S2420/11

Abstract: When compressing an HOA data frame representation, a gain control (15, 151) is applied for each channel signal before it is perceptually encoded (16). The gain values are transferred in a differential manner as side information. However, for starting decoding of such streamed compressed HOA data frame representation absolute gain values are required, which should be coded with a minimum number of bits. For determining such lowest integer number (βe) of bits the HOA data frame representation (C(k)) is rendered in spatial domain to virtual loudspeaker signals lying on a unit sphere, followed by normalisation of the HOA data frame representation (C(k)). Then the lowest integer number of bits is set to





β
e

=


⌈


log
2

(


⌈


log
2

(



K

M
⁢
A
⁢
X



·
O

)

⌉

+
1

)

⌉

.

公开(公告)号：US20230132142A1

公开(公告)日：2023-04-27

申请号：US17957199

申请日：2022-09-30

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Sven KORDON ,  Alexander KRUEGER ,  Oliver WUEBBOLT

IPC: G10L19/008 ,  H04S3/00 ,  G10L19/24

Abstract: Methods and apparatus for decoding a compressed Higher Order Ambisonics (HOA) representation of a sound or soundfield. The method may include receiving a bit stream containing the compressed HOA representation and decoding, based on a determination that there are multiple layers, the compressed HOA representation from the bitstream to obtain a sequence of decoded HOA representations. A first subset of the sequence of decoded HOA representations is determined based only on corresponding ambient HOA components. A second subset of the sequence of decoded HOA representations is determined based on corresponding ambient HOA components and corresponding predominant sound components. For a frame k, the sequence of decoded HOA representations are represented at least in part by c
^ n k
−
1 = c
^ AMB
,
n k
−
1 c
^ n k
−
1 = c
^ PS
,
n k
−
1 + c
^ AMB
,
n k
−
1 , for n in the first subset  
 
 
 
 
 
for n in the second subset where c
^ AMB,
n k
−
1 corresponds to the corresponding ambient HOA components and c
^ PS
,
n k
−
1 corresponds to the corresponding predominant sound components.

公开(公告)号：US20220217489A1

公开(公告)日：2022-07-07

申请号：US17700228

申请日：2022-03-21

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Sven KORDON ,  Alexander KRUEGER

IPC: H04S3/00 ,  G10L19/008

Abstract: Higher Order Ambisonics represents three-dimensional sound independent of a specific loudspeaker set-up. However, transmission of an HOA representation results in a very high bit rate. Therefore, compression with a fixed number of channels is used, in which directional and ambient signal components are processed differently. The ambient HOA component is represented by a minimum number of HOA coefficient sequences. The remaining channels contain either directional signals or additional coefficient sequences of the ambient HOA component, depending on what will result in optimum perceptual quality. This processing can change on a frame-by-frame basis.

公开(公告)号：US20210337334A1

公开(公告)日：2021-10-28

申请号：US17244746

申请日：2021-04-29

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Sven KORDON ,  Alexander KRUEGER

IPC: H04S3/00 ,  G10L19/008

Abstract: Higher Order Ambisonics represents three-dimensional sound independent of a specific loudspeaker set-up. However, transmission of an HOA representation results in a very high bit rate. Therefore, compression with a fixed number of channels is used, in which directional and ambient signal components are processed differently. The ambient HOA component is represented by a minimum number of HOA coefficient sequences. The remaining channels contain either directional signals or additional coefficient sequences of the ambient HOA component, depending on what will result in optimum perceptual quality. This processing can change on a frame-by-frame basis.

公开(公告)号：US20190295562A1

公开(公告)日：2019-09-26

申请号：US16377661

申请日：2019-04-08

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Alexander KRUEGER ,  Sven KORDON

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

Abstract: When compressing an HOA data frame representation, a gain control (15, 151) is applied for each channel signal before it is perceptually encoded (16). The gain values are transferred in a differential manner as side information. However, for starting decoding of such streamed compressed HOA data frame representation absolute gain values are required, which should be coded with a minimum number of bits. For determining such lowest integer number (βe) of bits the HOA data frame representation (C(k)) is rendered in spatial domain to virtual loudspeaker signals lying on a unit sphere, followed by normalisation of the HOA data frame representation (C(k)). Then the lowest integer number of bits is set to βe=┌ log2(┌ log2(√{square root over (KMAX)}·O)┐+1)┐.

公开(公告)号：US20190214027A1

公开(公告)日：2019-07-11

申请号：US16255358

申请日：2019-01-23

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Sven KORDON ,  Alexander KRUEGER

IPC: G10L19/008 ,  H04S7/00

CPC classification number: G10L19/008 ,  H04S7/30 ,  H04S2400/11 ,  H04S2420/11

Abstract: When compressing an HOA data frame representation, a gain control (15, 151) is applied for each channel signal before it is perceptually encoded (16). The gain values are transferred in a differential manner as side information. However, for starting decoding of such streamed compressed HOA data frame representation absolute gain values are required, which should be coded with a minimum number of bits. For determining such lowest integer number (βe) of bits the HOA data frame representation (C(k)) is rendered in spatial domain to virtual loudspeaker signals lying on a unit sphere, followed by normalisation of the HOA data frame representation (C(k)). Then the lowest integer number of bits is set to βe=┌log2(┌log2(√{square root over (KMAX)}·O)┐+1)┐.

公开(公告)号：US20190147891A1

公开(公告)日：2019-05-16

申请号：US16208284

申请日：2018-12-03

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Sven KORDON ,  Alexander KRUEGER

IPC: G10L19/008 ,  G10L19/24

Abstract: When decompressing an HOA data frame representation, a gain control (15, 151) is applied for each channel signal before it is perceptually encoded (16). The gain values are transferred in a differential manner as side information. However, for starting decoding of such streamed compressed HOA data frame representation absolute gain values are required, which should be coded with a minimum number of bits. For determining such lowest integer number (βe) of bits the HOA data frame representation (C(k)) is rendered in spatial domain to virtual loudspeaker signals lying on a unit sphere, followed by normalisation of the HOA data frame representation (C(k)). Then the lowest integer number of bits is set to βe=┌log2(┌log2(√{square root over (KMAX)}·O)┐+1)┐.

公开(公告)号：US20180234785A1

公开(公告)日：2018-08-16

申请号：US15891606

申请日：2018-02-08

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Sven KORDON ,  Alexander KRUEGER ,  Oliver WUEBBOLT

IPC: H04S3/00 ,  G10L19/008 ,  G10L19/24

CPC classification number: H04S3/008 ,  G10L19/008 ,  G10L19/24 ,  H04S2400/01 ,  H04S2420/11

Abstract: A method for compressing a HOA signal being an input HOA representation with input time frames (C(k)) of HOA coefficient sequences comprises spatial HOA encoding of the input time frames and subsequent perceptual encoding and source encoding. Each input time frame is decomposed (802) into a frame of predominant sound signals (XPS(k−1)) and a frame of an ambient HOA component ({tilde over (C)}AMB(k−1)). The ambient HOA component ({tilde over (C)}AMB(k−1)) comprises, in a layered mode, first HOA coefficient sequences of the input HOA representation (cAMB,n(k−1)) in lower positions and second HOA coefficient sequences (cAMB,n(k−1)) in remaining higher positions. The second HOA coefficient sequences are part of an HOA representation of a residual between the input HOA representation and the HOA representation of the predominant sound signals.

公开(公告)号：US20180007484A1

公开(公告)日：2018-01-04

申请号：US15702471

申请日：2017-09-12

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Sven KORDON ,  Alexander KRUEGER

IPC: H04S3/02 ,  G10L19/008

CPC classification number: H04S3/02 ,  G10L19/008 ,  H04S2420/11

Abstract: When compressing an HOA data frame representation, a gain control (15, 151) is applied for each channel signal before it is perceptually encoded (16). The gain values are transferred in a differential manner as side information. However, for starting decoding of such streamed compressed HOA data frame representation absolute gain values are required, which should be coded with a minimum number of bits. For determining such lowest integer number (βe) of bits the HOA data frame representation (C(k)) is rendered in spatial domain to virtual loudspeaker signals lying on a unit sphere, followed by normalisation of the HOA data frame representation (C(k)). Then the lowest integer number of bits is set to βe=┌log2(┌log2(√{square root over (KMAX)}·O)┐+1)┐.