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1. 发明申请

US20220124446A1 IN-SITU CALIBRATION OF MICROPHONE ARRAYS 有权
公开(公告)号：US20220124446A1
公开(公告)日：2022-04-21
申请号：US17500057
申请日：2021-10-13
申请人： MH Acoustics, LLC
发明人： Gary W. Elko , Jens M. Meyer
IPC分类号： H04S7/00 , H04R3/00 , H04R29/00 , H04R3/04 , H04R1/22 , G10K15/12
摘要： According to certain embodiments, a microphone array having a plurality of microphone elements is calibrated by ensonifying the microphone array at a first direction relative to the microphone array with a first acoustic signal to concurrently generate a first set of audio signals from two or more of the microphone elements and processing the first set of audio signals to calibrate the two or more microphone elements. One or more other sets of audio signals can be generated by ensonifying the microphone array with one or more other acoustic signals at one or more other directions relative to the microphone array, where the two or more microphone elements are calibrated using the first set and the one or more other sets of audio signals. The calibration process can be performed outside of an anechoic chamber using one or more acoustic sources located outside or inside the microphone array.

2. 发明申请

US20180227665A1 Spatial Encoding Directional Microphone Array 审中-公开
公开(公告)号：US20180227665A1
公开(公告)日：2018-08-09
申请号：US15571525
申请日：2017-06-12
申请人： MH Acoustics, LLC
发明人： Gary W. Elko , Tomas F. Gaensler , Jens M. Meyer , Eric J. Diethorn
IPC分类号： H04R1/40 , H04R3/00
CPC分类号： H04R1/406 , H04R3/005 , H04R2201/405 , H04R2499/11
摘要： In certain embodiments, an article of manufacture, such as a cell phone, has a device body with a non-spheroidal shape, such as a parallelepiped, and microphones configured at different locations on the device body. A signal processing system processes the microphone signals to generate a plurality of different output beampatterns in at least two non-parallel directions, wherein, in generating at least one of the output beampatterns, the signal processing system takes into account effects of the device body on the incoming acoustic signal. Four or more microphones can be used to generate B format output beampatterns, such as three dipole beampatterns and an omnidirectional beampattern.

3. 发明授权

US09628905B2 Adaptive beamforming for eigenbeamforming microphone arrays 有权
公开(公告)号：US09628905B2
公开(公告)日：2017-04-18
申请号：US14425383
申请日：2014-07-15
申请人： MH Acoustics, LLC
发明人： Gary W. Elko , Jens M. Meyer
IPC分类号： H04R1/32 , H04R3/00 , H04R3/04
CPC分类号： H04R1/326 , H04R3/005 , H04R3/04 , H04R2201/401 , H04R2430/23 , H04S2400/15
摘要： An exemplary audio signal processing system includes a modal decomposer and an adaptive modal beamformer. The modal decomposer generates a plurality of zeroth-order eigenbeams from audio signals from an (e.g., spherical) array of audio sensors. The adaptive modal beamformer (i) steers the zeroth-order eigenbeams to a specified direction, (ii) adaptively generates a plurality of weighting coefficients for the plurality of zeroth-order eigenbeams, where the plurality of weighting coefficients satisfy a constraint of having only non-negative values, (iii) respectively applies the plurality of adaptively generated weighting coefficients to the plurality of steered, zeroth-order eigenbeams to generate a plurality of weighted, steered, zeroth-order eigenbeams, and (iv) combines the plurality of weighted, steered, zeroth-order eigenbeams to generate an output audio signal. Some embodiments have a further constraint that the weighting coefficients sum to a specified value (e.g., one).

4. 发明申请

US20160219365A1 Adaptive Beamforming for Eigenbeamforming Microphone Arrays 有权
标题翻译：用于本征波束形成麦克风阵列的自适应波束成形
公开(公告)号：US20160219365A1
公开(公告)日：2016-07-28
申请号：US14425383
申请日：2014-07-15
申请人： MH Acoustics, LLC
发明人： Gary W. Elko , Jens M. Meyer
IPC分类号： H04R1/32 , H04R3/04 , H04R3/00
CPC分类号： H04R1/326 , H04R3/005 , H04R3/04 , H04R2201/401 , H04R2430/23 , H04S2400/15
摘要： An exemplary audio signal processing system includes a modal decomposer and an adaptive modal beamformer. The modal decomposer generates a plurality of zeroth-order eigenbeams from audio signals from an (e.g., spherical) array of audio sensors. The adaptive modal beamformer (i) steers the zeroth-order eigenbeams to a specified direction, (ii) adaptively generates a plurality of weighting coefficients for the plurality of zeroth-order eigenbeams, where the plurality of weighting coefficients satisfy a constraint of having only non-negative values, (iii) respectively applies the plurality of adaptively generated weighting coefficients to the plurality of steered, zeroth-order eigenbeams to generate a plurality of weighted, steered, zeroth-order eigenbeams, and (iv) combines the plurality of weighted, steered, zeroth-order eigenbeams to generate an output audio signal. Some embodiments have a further constraint that the weighting coefficients sum to a specified value (e.g., one).
摘要翻译：示例性音频信号处理系统包括模态分解器和自适应模态波束形成器。模态分解器从音频传感器（例如，球面）阵列的音频信号产生多个零级本征束。自适应模态波束形成器（i）将第零阶本征波束引导到指定方向，（ii）自适应地生成多个零阶本征波束的多个加权系数，其中多个加权系数满足只有非零阶本征波束的约束，（iii）分别将多个自适应生成的加权系数分别应用于多个转向零阶本征束，以生成多个加权的，转向的零级本征束，并且（iv）将多个加权的，转向，零阶本征波束以产生输出音频信号。一些实施例具有进一步的约束，即加权系数与指定值（例如，一个）相加。

5. 发明申请

US20160073199A1 POLYHEDRAL AUDIO SYSTEM BASED ON AT LEAST SECOND-ORDER EIGENBEAMS 有权
标题翻译：基于至少二级特征的POLYHEDRAL音频系统
公开(公告)号：US20160073199A1
公开(公告)日：2016-03-10
申请号：US14944425
申请日：2015-11-18
申请人： MH Acoustics, LLC
发明人： Gary W. Elko , Jens M. Meyer
IPC分类号： H04R5/027 , H04R3/00 , H04S3/02
CPC分类号： H04R5/027 , H04R3/005 , H04R2201/003 , H04S3/02 , H04S2400/15 , H04S2420/11
摘要： A microphone array-based audio system that supports representations of auditory scenes using second-order (or higher) harmonic expansions based on the audio signals generated by the microphone array. In one embodiment, a plurality of audio sensors are mounted on the surface of an acoustically rigid polyhedron that approximates a sphere. The number and location of the audio sensors on the polyhedron are designed to enable the audio signals generated by those sensors to be decomposed into a set of eigenbeams having at least one eigenbeam of order two (or higher). Beamforming (e.g., steering, weighting, and summing) can then be applied to the resulting eigenbeam outputs to generate one or more channels of audio signals that can be utilized to accurately render an auditory scene.
摘要翻译：基于麦克风阵列的音频系统，其基于由麦克风阵列产生的音频信号，支持使用二阶（或更高）谐波扩展的听觉场景的表示。在一个实施例中，多个音频传感器安装在接近球体的声学刚性多面体的表面上。多面体上的音频传感器的数量和位置被设计成使得由这些传感器产生的音频信号能够被分解为具有至少一个二阶（或更高）的本征束的一组本征束。然后可以将波束形成（例如，导向，加权和求和）应用于所产生的本征波束输出以产生可用于准确地渲染听觉场景的一个或多个音频信号通道。

6. 发明申请

US20150201271A1 Earphones Having Configurable Microphone Arrays 有权
标题翻译：具有可配置麦克风阵列的耳机
公开(公告)号：US20150201271A1
公开(公告)日：2015-07-16
申请号：US14348629
申请日：2013-09-26
申请人： MH Acoustics, LLC
发明人： Eric J. Diethorn , Gary W. Elko , Jens M. Meyer , Tomas F. Gaensler
IPC分类号： H04R1/10 , H04M1/05
CPC分类号： H04R1/1091 , H04M1/05 , H04R1/10 , H04R29/005 , H04R2201/107
摘要： Accessories for a telephone include at least one earphone and at least one microphone array having multiple microphones used to generate outgoing audio signals for (i) processing by a signal processor and (ii) transmission by the telephone. In one embodiment, two earphones are connected by two corresponding wires, and two microphone arrays, respectively connected to the two wires, are mechanically and electronically configurable in a plurality of use modes to generate outgoing audio signals for processing by the signal processor. The use modes include one or more and possibly all of a single-sided mode, a two-sided mode, an enhanced directivity mode, a stereo recording mode, a multichannel recording mode, a conference mode, and a two-dimensional-array mode, where one of the use modes is automatically detected by the signal processor based on the audio signals generated by the two microphone arrays.
摘要翻译：用于电话的附件包括至少一个耳机和至少一个具有多个麦克风的麦克风阵列，用于产生输出音频信号，用于（i）由信号处理器处理和（ii）由电话进行的传输。在一个实施例中，两个耳机通过两个对应的导线连接，并且分别连接到两条导线的两个麦克风阵列以多种使用模式机械地和电子地配置，以产生输出音频信号以供信号处理器处理。使用模式包括单面模式，双面模式，增强指向性模式，立体声记录模式，多通道记录模式，会议模式和二维阵列模式中的一个或多个且可能全部其中，使用模式之一由信号处理器基于由两个麦克风阵列产生的音频信号自动检测。

7. 发明授权

US10659873B2 Spatial encoding directional microphone array 有权
公开(公告)号：US10659873B2
公开(公告)日：2020-05-19
申请号：US16524633
申请日：2019-07-29
申请人： MH Acoustics, LLC
发明人： Gary W. Elko , Tomas F. Gaensler , Jens M. Meyer , Eric J. Diethorn
IPC分类号： H04R1/40 , H04R3/00
摘要： In one embodiment, an article of manufacture has microphones mounted at different locations on a non-spheroidal device body and a signal-processing system that processes the microphone signals to generate a B Format audio output having a zeroth-order beampattern signal and three first-order beampattern signals in three orthogonal directions. The signal-processing system generates at least one of the first-order beampattern signals based on effects of the device body on an incoming acoustic signal. The microphone signals used to generate each first-order beampattern signal have an inter-microphone effective distance that is less than a wavelength at a specified high-frequency value (e.g.,

8. 发明授权

US10477304B2 Spatial encoding directional microphone array 有权
公开(公告)号：US10477304B2
公开(公告)日：2019-11-12
申请号：US16383928
申请日：2019-04-15
申请人： MH Acoustics, LLC
发明人： Gary W. Elko , Tomas F. Gaensler , Jens M. Meyer , Eric J. Diethorn
IPC分类号： H04R1/40 , H04R3/00
摘要： In one embodiment, an article of manufacture has microphones mounted at different locations on a non-spheroidal device body and a signal-processing system that processes the microphone signals to generate a B Format audio output having a zeroth-order beampattern signal and three first-order beampattern signals in three orthogonal directions. The signal-processing system generates at least one of the first-order beampattern signals based on effects of the device body on an incoming acoustic signal. The microphone signals used to generate each first-order beampattern signal have an inter-microphone effective distance that is less than a wavelength at a specified high-frequency value (e.g.,

9. 发明授权

US10283139B2 Reverberation suppression using multiple beamformers 有权
公开(公告)号：US10283139B2
公开(公告)日：2019-05-07
申请号：US15542008
申请日：2016-01-08
申请人： mh Acoustics, LLC
发明人： Gary W. Elko , Eric J. Diethorn , Steven Backer , Jens M. Meyer , Tomas F. Gaensler
IPC分类号： G10L21/0232 , G10L21/0208 , G10L21/0216 , G10L21/0264 , H04R3/00 , H04R1/40
摘要： In one embodiment, an audio processing system reduces reverberation in an audio signal. A first beamformer generates a first, directional beampattern, and a second beamformer generates a second beampattern. A signal-processing subsystem (i) processes the first and second beampatterns to generate suppression factors corresponding to the reverberation and (ii) applies the suppression factors to one of the first and second beampatterns to reduce the reverberation in the beampattern. In one implementation, the beampatterns are crossed-beam beampatterns, and the signal-processing subsystem generates the suppression factors based on coherence estimates for the beampatterns. In another implementation, the beampatterns are disjoint beampatterns, and the signal-processing subsystem generates the suppression factors based on short-time and long-time envelope estimates for the beampatterns. Depending on the implementation, the beamformers may be co-located with differently shaped beampatterns or non-co-located with differently or equally shaped beampatterns.

10. 发明授权

US09445198B2 Polyhedral audio system based on at least second-order eigenbeams 有权
公开(公告)号：US09445198B2
公开(公告)日：2016-09-13
申请号：US14944425
申请日：2015-11-18
申请人： MH Acoustics, LLC
发明人： Gary W. Elko , Jens M. Meyer
IPC分类号： H04R5/027 , H04R3/00 , H04S3/02
CPC分类号： H04R5/027 , H04R3/005 , H04R2201/003 , H04S3/02 , H04S2400/15 , H04S2420/11
摘要： A microphone array-based audio system that supports representations of auditory scenes using second-order (or higher) harmonic expansions based on the audio signals generated by the microphone array. In one embodiment, a plurality of audio sensors are mounted on the surface of an acoustically rigid polyhedron that approximates a sphere. The number and location of the audio sensors on the polyhedron are designed to enable the audio signals generated by those sensors to be decomposed into a set of eigenbeams having at least one eigenbeam of order two (or higher). Beamforming (e.g., steering, weighting, and summing) can then be applied to the resulting eigenbeam outputs to generate one or more channels of audio signals that can be utilized to accurately render an auditory scene.

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