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1. 发明申请

US20210289304A1 AUDIO PRECOMPENSATION FILTER OPTIMIZED WITH RESPECT TO BRIGHT AND DARK ZONES 有权
公开(公告)号：US20210289304A1
公开(公告)日：2021-09-16
申请号：US16467457
申请日：2016-12-07
申请人： DIRAC RESEARCH AB
发明人： Simon WIDMARK
IPC分类号： H04S7/00
摘要： Disclosed is a system configured to determine filter parameters of an audio precompensation filter for the compensation of an associated sound generating system having at least two loudspeakers. The system is configured to obtain sound field models describing the sound field in at least one region of space designated the bright zone and the sound field in at least one region of space designated the dark zone. The system is also configured to obtain a target sound field in the bright zone. Further, the system is configured to determine filter parameters of the audio precompensation filter so that a criterion function is optimized under the constraint of causality and stability of the dynamics of the audio precompensation filter to enable reproduction of a desired target sound field in the bright zone, while reproducing as little sound as possible in the dark zone.

2. 发明申请

US20140153744A1 Audio Precompensation Controller Design Using a Variable Set of Support Loudspeakers 有权
标题翻译：音频预补偿控制器设计使用一组可变的支持扬声器
公开(公告)号：US20140153744A1
公开(公告)日：2014-06-05
申请号：US14009215
申请日：2012-03-22
申请人： Lars-Johan Brannmark , Anders Ahlen , Adrian Bahne
发明人： Lars-Johan Brannmark , Anders Ahlen , Adrian Bahne
IPC分类号： H04R3/04
CPC分类号： H04R3/04 , H04S5/00 , H04S7/301 , H04S7/305
摘要： Disclosed is a method and a system to determine an audio precompensation controller for an associated sound generating system including a total of N≧2 loudspeakers, each having a loudspeaker input. The audio precompensation controller has a number L≧1 inputs for L input signals and N outputs for N controller output signals, one to each loudspeaker. For each one of at least a subset of the N loudspeaker inputs, an impulse response is estimated at each measurement position. For each one of the L input signal(s), a selected one of the N loudspeakers is specified as a primary loudspeaker and a selected subset S including at least one of the N loudspeakers as support loudspeaker(s).
摘要翻译：公开了一种确定用于相关联的声音产生系统的音频预补偿控制器的方法和系统，包括总共具有扬声器输入的N≥2个扬声器。音频预补偿控制器具有L个输入信号的L≥1个输入和N个控制器输出信号的N个输出，每个扬声器一个。对于N个扬声器输入的至少一个子集中的每一个，在每个测量位置估计脉冲响应。对于L个输入信号中的每一个，将N个扬声器中的所选择的一个指定为主扬声器，并且将包括至少一个N个扬声器中的至少一个的选定子集S指定为支持扬声器。

3. 发明授权

US07215787B2 Digital audio precompensation 有权
标题翻译：数字音频预补偿
公开(公告)号：US07215787B2
公开(公告)日：2007-05-08
申请号：US10123318
申请日：2002-04-17
申请人： Mikael Sternad , Anders Ahlen
发明人： Mikael Sternad , Anders Ahlen
IPC分类号： H03G5/00
CPC分类号： H04R3/04 , H04R29/007 , H04S7/307
摘要： The invention concerns digital audio precompensation, and particularly the design of digital precompensation filters. The invention proposes an audio precompensation filter design scheme that uses a novel class of design criteria. Briefly, filter parameters are determined based on a weighting between, on one hand, approximating the precompensation filter to a fixed, non-zero filter component and, on the other hand, approximating the precompensated model response to a reference system response. For design purposes, the precompensation filter is preferably regarded as being additively decomposed into a fixed, non-zero component and an adjustable compensator component. The fixed component is normally configured by the filter designer, whereas the adjustable compensator component is determined by optimizing a criterion function involving the above weighting. The weighting can be made frequency- and/or channel-dependent to provide a very powerful tool for effectively controlling the extent and amount of compensation to be performed in different frequency regions and/or in different channels.
摘要翻译：本发明涉及数字音频预补偿，特别是数字预补偿滤波器的设计。本发明提出了一种使用新颖设计标准的音频预补偿滤波器设计方案。简而言之，滤波器参数基于一方面将预补偿滤波器近似为固定的非零滤波器组件之间的加权来确定，另一方面，近似预参考系统响应的预补偿模型响应。为了设计目的，预补偿滤波器优选地被认为是被加法地分解成固定的非零分量和可调补偿器分量。固定分量通常由滤波器设计者构成，而可调节补偿器分量通过优化涉及上述加权的标准函数来确定。可以进行频率和/或频道依赖的加权，以提供用于有效地控制在不同频率区域和/或不同频道中执行的补偿的范围和量的非常强大的工具。

4. 发明公开

US20230370804A1 HRTF PRE-PROCESSING FOR AUDIO APPLICATIONS 审中-公开
公开(公告)号：US20230370804A1
公开(公告)日：2023-11-16
申请号：US18247041
申请日：2021-10-04
申请人： DIRAC RESEARCH AB
发明人： Viktor Gunnarsson
IPC分类号： H04S7/00
CPC分类号： H04S7/304 , H04S7/307 , H04S2420/01
摘要： There is provided a method and corresponding system for processing a set including Head-Related Transfer Functions, HRTFs, for at least two different directions of sound incidence to enable improved generation, modeling or simulation of ear signals corresponding to a diffuse sound field. For each direction of sound incidence to the head, a left-ear HRTF represents the transfer function from a sound source to the left ear, and a right-ear HRTF represents the corresponding transfer function to the right ear. The method comprises applying (S1) a phase adjustment to each HRTF, for each ear and direction, for reducing Interaural Time Differences, ITD, above a threshold frequency or in a frequency band above the threshold frequency; and adding (S2) a direction-dependent Interaural Phase Difference, IPD, to each HRTF, for each ear and direction, for reducing Interaural Coherence when modelling or simulating a diffuse sound field.

5. 发明授权

US10284995B2 Reducing the phase difference between audio channels at multiple spatial positions 有权
公开(公告)号：US10284995B2
公开(公告)日：2019-05-07
申请号：US15769526
申请日：2015-10-30
申请人： DIRAC RESEARCH AB
发明人： Lars-Johan Brännmark , Jakob Ågren
IPC分类号： H04S1/00 , H04S7/00
摘要： There is provided a method and corresponding system for determining phase adjustment filters for an associated sound generating system including at least two audio reproduction channels C1 and C2 where each of the audio reproduction channels C1 and C2 has an input signal and at least one loudspeaker located in a listening environment. The method includes estimating, for each of the audio reproduction channels C1 and C2, an acoustic transfer function at each of M≥1 spatial positions in the listening environment, based on sound measurements at the spatial positions; and determining, based on the acoustic transfer functions, phase adjustment filters F1 and to be applied, respectively, to the audio reproduction channels C1 and C2, to reduce the inter-loudspeaker differential phase, IDP, between the audio reproduction channels C1 and C2 in p listener positions.

6. 发明授权

US09426600B2 Audio precompensation controller design with pairwise loudspeaker channel similarity 有权
标题翻译：音频预补偿控制器设计与成对扬声器通道相似
公开(公告)号：US09426600B2
公开(公告)日：2016-08-23
申请号：US14402900
申请日：2013-06-20
申请人： DIRAC RESEARCH AB
发明人： Adrian Bahne , Lars-Johan Brannmark , Anders Ahlen
IPC分类号： H04S7/00 , H04R3/04 , H04R5/04 , H04R3/12
CPC分类号： H04S7/307 , H04R3/04 , H04R3/12 , H04R5/04 , H04S7/301
摘要： A method for determining an audio precompensation controller for an associated sound generating system comprising a total of N≧2 loudspeakers, each having a loudspeaker input. The audio precompensation controller has a number L≧2 inputs for L input signal(s) and N outputs for N controller output signals, one to each loudspeaker. It is relevant to: estimate (S1), for each one of at least a subset of the N loudspeaker inputs, an impulse response at each measurement position; specify (S2), for each one of the L input signal(s), a selected one of the N loudspeakers as a primary loudspeaker and optionally a selected subset S including at least one of the N loudspeakers as support loudspeaker(s); select (S2) at least one loudspeaker pair, that is required to be symmetrical with respect to the listing position; and specify (S3), for each primary loudspeaker, a target impulse response at each measurement position.
摘要翻译：一种用于确定用于相关联的声音产生系统的音频预补偿控制器的方法，包括总共具有扬声器输入的N≥2个扬声器。音频预补偿控制器具有L个输入信号的L≥2个输入和N个控制器输出信号的N个输出，每个扬声器一个。这涉及：估计（S1）对于N个扬声器输入的至少一个子集中的每一个，在每个测量位置处的脉冲响应; 为所述L个输入信号中的每一个指定（S2），所述N个扬声器中的所选择的一个作为主扬声器，以及可选地包括所述N个扬声器中的至少一个作为支持扬声器的选定子集S; 选择（S2）至少一个扬声器对，其要求相对于列表位置对称; 并且为每个主扬声器指定（S3）在每个测量位置处的目标脉冲响应。

7. 发明申请

US20090238380A1 SPATIALLY ROBUST AUDIO PRECOMPENSATION 有权
标题翻译：空间鲁棒的音频预告
公开(公告)号：US20090238380A1
公开(公告)日：2009-09-24
申请号：US12052031
申请日：2008-03-20
申请人： Lars Johan BRANNMARK , Mikael STERNAD , Anders AHLEN
发明人： Lars Johan BRANNMARK , Mikael STERNAD , Anders AHLEN
IPC分类号： H03G5/00
CPC分类号： H03G5/005 , H04R29/001 , H04S7/301
摘要： A discrete-time audio precompensation filter is designed based on a linear model that describes the dynamic response of a sound generating system at p>1 listening positions. The filter construction is based on providing information (S2) representative of n non-minimum phase zeros {z,} that are outside of the stability region |z|=1 in the complex frequency domain. A causal Finite Impulse Response (FIR) filter, of user-specified degree d, having coefficients corresponding to a causal part of a delayed non-causal impulse response is determined (S4) based on the information representative of n non-minimum phase zeros. The resulting precompensation filter is determined (S5) as the product of at least two scalar dynamic systems, represented by an inverse of a characteristic scalar magnitude response (S3) in the frequency domain that represents the power gains at the listening positions, and the causal Finite Impulse Response (FIR) filter designed (S4) to approximately invert only non-minimum phase zeros that can be safely inverted.
摘要翻译：基于线性模型设计离散时间音频预补偿滤波器，该线性模型描述了在第1个听音位置的声音发生系统的动态响应。滤波器构造基于在复频域中提供表示在稳定区域| z | = 1之外的n个非最小相位零点{z，}的信息（S2）。基于代表n个非最小相位零的信息，确定具有与延迟非因果脉冲响应的因果部分相对应的系数的用户指定度d的因果有限脉冲响应（FIR）滤波器（S4）。确定所产生的预补偿滤波器（S5）作为由代表听音位置的功率增益的频域中的特征标量响应（S3）的倒数所代表的至少两个标量动态系统的乘积，以及因果设计有限脉冲响应（FIR）滤波器（S4），仅近似反转可以安全地反转的非最小相位零点。

8. 发明授权

US11800309B2 Bass management in audio systems 有权
公开(公告)号：US11800309B2
公开(公告)日：2023-10-24
申请号：US17620591
申请日：2020-04-23
申请人： DIRAC RESEARCH AB
发明人： Lars-Johan Brännmark , Jakob Ågren , Frans Rosencrantz
IPC分类号： H04R3/00 , H04R29/00 , H04S7/00 , H04R1/24 , H04R3/12
CPC分类号： H04S7/301 , H04R1/24 , H04R3/12 , H04R29/001
摘要： There is provided a method for controlling bass reproduction properties of a multichannel audio system, wherein the audio system has inputs for at least two audio input signals and includes a set of loudspeakers, including at least one bass-capable loudspeaker and at least two high-range loudspeakers, each loudspeaker being associated with a loudspeaker channel. The method includes obtaining impulse responses or transfer functions that represent the sound reproduction properties of each loudspeaker channel at a number of measurement or control positions. The method also includes tuning, when the audio system includes more than one bass-capable loudspeaker, loudspeaker channels of at least two bass loudspeakers to each other so that their sum impulse response has minimum spatial variability, and/or controlling high-range loudspeaker speaker channels to be in-phase with each other and/or with bass-capable loudspeaker channel in a crossover frequency band.

9. 发明授权

US11246000B2 Audio precompensation filter optimized with respect to bright and dark zones 有权
公开(公告)号：US11246000B2
公开(公告)日：2022-02-08
申请号：US16467457
申请日：2016-12-07
申请人： DIRAC RESEARCH AB
发明人： Simon Widmark
IPC分类号： H04S7/00
摘要： Disclosed is a system configured to determine filter parameters of an audio precompensation filter for the compensation of an associated sound generating system having at least two loudspeakers. The system is configured to obtain sound field models describing the sound field in at least one region of space designated the bright zone and the sound field in at least one region of space designated the dark zone. The system is also configured to obtain a target sound field in the bright zone. Further, the system is configured to determine filter parameters of the audio precompensation filter so that a criterion function is optimized under the constraint of causality and stability of the dynamics of the audio precompensation filter to enable reproduction of a desired target sound field in the bright zone, while reproducing as little sound as possible in the dark zone.

10. 发明授权

US09781510B2 Audio precompensation controller design using a variable set of support loudspeakers 有权
公开(公告)号：US09781510B2
公开(公告)日：2017-10-03
申请号：US14009215
申请日：2012-03-22
申请人： Lars-Johan Brannmark , Anders Ahlen , Adrian Bahne
发明人： Lars-Johan Brannmark , Anders Ahlen , Adrian Bahne
IPC分类号： H04R5/00 , H04R3/04 , H04S7/00 , H04S5/00
CPC分类号： H04R3/04 , H04S5/00 , H04S7/301 , H04S7/305
摘要： Disclosed is a method and a system to determine an audio precompensation controller for an associated sound generating system including a total of N≧2 loudspeakers, each having a loudspeaker input. The audio precompensation controller has a number L≧1 inputs for L input signals and N outputs for N controller output signals, one to each loudspeaker. For each one of at least a subset of the N loudspeaker inputs, an impulse response is estimated at each measurement position. For each one of the L input signal(s), a selected one of the N loudspeakers is specified as a primary loudspeaker and a selected subset S including at least one of the N loudspeakers as support loudspeaker(s).

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