公开(公告)号：US20190325885A1

公开(公告)日：2019-10-24

申请号：US16363099

申请日：2019-03-25

Applicant: DOLBY INTERNATIONAL AB

Inventor： Lars VILLEMOES ,  Heidi-Maria LEHTONEN ,  Heiko PURNHAGEN ,  Toni HIRVONEN

IPC: G10L19/16 ,  G10L19/26 ,  G10L19/008 ,  H04S5/00

Abstract: An encoding system encodes an N-channel audio signal (X), wherein N≥3, as a single-channel downmix signal (Y) together with dry and wet upmix parameters ({tilde over (C)},{tilde over (P)}). In a decoding system, a decorrelating section outputs, based on the downmix signal, an (N−1)-channel decorrelated signal (Z); a dry upmix section maps the downmix signal linearly in accordance with dry upmix coefficients (C) determined based on the dry upmix parameters; a wet upmix section populates an intermediate matrix based on the wet upmix parameters and knowing that the intermediate matrix belongs to a predefined matrix class, obtains wet upmix coefficients (P) by multiplying the intermediate matrix by a predefined matrix, and maps the decorrelated signal linearly in accordance with the wet upmix coefficients; and a combining section combines outputs from the upmix sections to obtain a reconstructed signal ({circumflex over (X)}) corresponding to the signal to be reconstructed.

公开(公告)号：US20230215423A1

公开(公告)日：2023-07-06

申请号：US17921564

申请日：2021-05-03

Applicant: Dolby Laboratories Licensing Corporation ,  DOLBY INTERNATIONAL AB

Inventor： Aaron Steven MASTER ,  Lie LU ,  Heidi-Maria LEHTONEN

IPC: G10L15/08 ,  G10L21/0272

CPC classification number: G10L15/08 ,  G10L21/0272

Abstract: Computer-implemented methods and devices for combined audio separation and classification are provided. An estimated separated signal is time gated based on a determination of an audio classifier of, at least in part, the original mix of signals before separation. Combined separation, classification, and time gating of both the estimated signal and a residual signal are also provided.

公开(公告)号：US20180268831A1

公开(公告)日：2018-09-20

申请号：US15985635

申请日：2018-05-21

Applicant: DOLBY INTERNATIONAL AB

Inventor： Lars VILLEMOES ,  Heidi-Maria LEHTONEN ,  Heiko PURNHAGEN ,  Toni HIRVONEN

IPC: G10L19/16 ,  G10L19/008 ,  H04S5/00 ,  G10L19/26

CPC classification number: G10L19/167 ,  G10L19/008 ,  G10L19/265 ,  H04S5/005 ,  H04S2420/03

Abstract: An encoding system (400) encodes an N-channel audio signal (X), wherein N≥3, as a single-channel downmix signal (Y) together with dry and wet upmix parameters ({tilde over (C)}, {tilde over (P)}). In a decoding system (200), a decorrelating section (101) outputs, based on the downmix signal, an (N−1)-channel decorrelated signal (Z); a dry upmix section (102) maps the downmix signal linearly in accordance with dry upmix coefficients (C) determined based on the dry upmix parameters; a wet upmix section (103) populates an intermediate matrix based on the wet upmix parameters and knowing that the intermediate matrix belongs to a predefined matrix class, obtains wet upmix coefficients (P) by multiplying the intermediate matrix by a predefined matrix, and maps the decorrelated signal linearly in accordance with the wet upmix coefficients; and a combining section (104) combines outputs from the upmix sections to obtain a reconstructed signal ({circumflex over (X)}) corresponding to the signal to be reconstructed.

公开(公告)号：US20200302943A1

公开(公告)日：2020-09-24

申请号：US16842212

申请日：2020-04-07

Applicant: DOLBY INTERNATIONAL AB

Inventor： Lars VILLEMOES ,  Heidi-Maria LEHTONEN ,  Heiko PURNHAGEN ,  Toni HIRVONEN

IPC: G10L19/16 ,  G10L19/26 ,  G10L19/008 ,  H04S5/00

Abstract: An encoding system encodes an N-channel audio signal (X), wherein N≥3, as a single-channel downmix signal (Y) together with dry and wet upmix parameters ({tilde over (C)}, {tilde over (P)}). In a decoding system, a decorrelating section outputs, based on the downmix signal, an (N−1)-channel decorrelated signal (Z); a dry upmix section maps the downmix signal linearly in accordance with dry upmix coefficients (C) determined based on the dry upmix parameters; a wet upmix section populates an intermediate matrix based on the wet upmix parameters and knowing that the intermediate matrix belongs to a predefined matrix class, obtains wet upmix coefficients (P) by multiplying the intermediate matrix by a predefined matrix, and maps the decorrelated signal linearly in accordance with the wet upmix coefficients; and a combining section combines outputs from the upmix sections to obtain a reconstructed signal ({circumflex over (X)}) corresponding to the signal to be reconstructed.

公开(公告)号：US20170332185A1

公开(公告)日：2017-11-16

申请号：US15522255

申请日：2015-10-28

Applicant: DOLBY INTERNATIONAL AB

Inventor： Lars VILLEMOES ,  Heiko PURNHAGEN ,  Heidi-Maria LEHTONEN

IPC: H04S3/00 ,  G10L19/008

CPC classification number: H04S3/008 ,  G10L19/008 ,  H04S2400/01 ,  H04S2400/03 ,  H04S2420/03

Abstract: In an encoding section (100), a downmix section (110) forms first and second channels (L1, L2) of a downmix signal as linear combinations of first and second groups (401, 402) of channels, respectively, of an M-channel audio signal; and an analysis section (120) determines upmix parameters (αLU) for parametric reconstruction of the audio signal, and mixing parameters (αLM). In a decoding section (1200), a decorrelating section (1210) outputs a decorrelated signal (D) based on the downmix signal; and a mixing section (1220) determines mixing coefficients based on the mixing parameters or the upmix parameters, and forms a K-channel output signal ({tilde over (L)}1, . . . , {tilde over (L)}K) as a linear combination of the downmix signal and the decorrelated signal in accordance with the mixing coefficients. The channels of the output signal approximate linear combinations of K groups (501-502, 1301-1303) of channels, respectively, of the audio signal. The K groups constitute a different partition of the audio signal than the first and second groups, and 2≦K

公开(公告)号：US20170339505A1

公开(公告)日：2017-11-23

申请号：US15521157

申请日：2015-10-29

Applicant: DOLBY INTERNATIONAL AB

Inventor： Heiko PURNHAGEN ,  Heidi-Maria LEHTONEN ,  Janusz KLEJSA

IPC: H04S3/00 ,  G10L19/008 ,  G10L19/22

CPC classification number: H04S3/008 ,  G10L19/008 ,  G10L19/22 ,  H04S7/00 ,  H04S2400/03 ,  H04S2420/03

Abstract: A control section (1009) receives signaling (S) indicating one of at least two coding formats (F1, F2, F3) of an M-channel audio signal (L, LS, LB, TFL, TBL), the coding formats corresponding to different partitions of the channels of the audio signal into respective first and second groups (601, 602), wherein, in the indicated coding format, first and second channels (L1, L2) of a downmix signal correspond to linear combinations of the first and second groups, respectively; and a decoding section (900) reconstructs the audio signal based on the downmix signal and associated upmix parameters (αL). In the decoding section: a decorrelation input signal (D1, D2, D3) is determined based on the downmix signal and the indicated coding format; and wet and dry upmix coefficients, controlling linear mappings of the downmix signal and a decorrelated signal, generated based on the decorrelation input signal, are determined based on the upmix parameters and the indicated coding format.

公开(公告)号：US20160247514A1

公开(公告)日：2016-08-25

申请号：US15031130

申请日：2014-10-21

Applicant: DOLBY INTERNATIONAL AB

Inventor： Lars VILLEMOES ,  Heidi-Maria LEHTONEN ,  Heiko PURNHAGEN ,  Toni HIRVONEN

IPC: G10L19/16 ,  H04S5/00

CPC classification number: G10L19/167 ,  G10L19/008 ,  G10L19/265 ,  H04S5/005 ,  H04S2420/03

Abstract: An encoding system (400) encodes an N-channel audio signal (X), wherein N≧3, as a single-channel downmix signal (Y) together with dry and wet upmix parameters (C, P). In a decoding system (200), a decorrelating section (101) outputs, based on the downmix signal, an (N−1)-channel decorrelated signal (Z); a dry upmix section (102) maps the downmix signal linearly in accordance with dry upmix coefficients (C) determined based on the dry upmix parameters; a wet upmix section (103) populates an intermediate matrix based on the wet upmix parameters and knowing that the intermediate matrix belongs to a predefined matrix class, obtains wet upmix coefficients (P) by multiplying the intermediate matrix by a predefined matrix, and maps the decorrelated signal linearly in accordance with the wet upmix coefficients; and a combining section (104) combines outputs from the upmix sections to obtain a reconstructed signal (X) corresponding to the signal to be reconstructed.

Abstract translation: 编码系统（400）将N沟道音频信号（X），其中N≥3作为单声道下混信号（Y）和干和上混合参数（C，P）一起编码。 在解码系统（200）中，解相关部分（101）根据所述下混信号输出（N-1）信道解相关信号（Z）; 干混合部分（102）根据干燥上混参数确定的干混上限系数（C）线性地映射下混合信号; 湿混合部分（103）基于湿混合参数填充中间矩阵，并且知道中间矩阵属于预定矩阵类，通过将中间矩阵乘以预定义矩阵来获得湿上混系数（P），并将 去相关信号根据潮湿混合系数线性地进行; 并且组合部分（104）组合来自上混段的输出，以获得与要重构的信号相对应的重构信号（X）。