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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
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.
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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
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.
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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
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).
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4.发明授权Inter-channel coherence reduction for stereophonic and multichannel acoustic echo cancellation 有权用于立体声和多通道声学回声消除的通道间相干性降低公开(公告)号：US09445196B2
公开(公告)日：2016-09-13
申请号：US14334915
申请日：2014-07-18
申请人： MH Acoustics, LLC
摘要： In an audio system having acoustic echo, incoming audio signals are decorrelated by applying both phase modulation and amplitude modulation. The resulting decorrelated signals are rendered by loudspeakers, and co-located microphones generate outgoing audio signals that include echo signals caused by the existence of acoustic echo paths from the loudspeakers to the microphones. Acoustic echo cancellation (AEC) is applied to the outgoing audio signals to reduce the amount of echo in those signals. Decorrelating the incoming audios signals using amplitude modulation in addition to phase modulation can increase the effectiveness of the AEC processing. In a frequency-domain implementation, the amount of amplitude modulation can be different for different frequency bands (e.g., greater amplitude modulation for lower frequencies corresponding to human speech and/or no amplitude modulation for higher frequencies).
摘要翻译： 在具有声学回声的音频系统中，输入的音频信号通过应用相位调制和幅度调制而去相关。 所产生的去相关信号由扬声器渲染，并且位于相同位置的麦克风产生输出音频信号，其包括由从扬声器到麦克风的声学回声路径的存在而引起的回波信号。 声学回声消除（AEC）被应用于输出音频信号以减少那些信号中的回波量。 除相位调制之外，使用幅度调制对输入的音频信号进行解相关可以提高AEC处理的有效性。 在频域实现中，不同频带的幅度调制量可以是不同的（例如，对于较低频率的较低频率的较大振幅调制和/或对于较高频率没有幅度调制）。
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公开(公告)号：US09301049B2
公开(公告)日：2016-03-29
申请号：US13596563
申请日：2012-08-28
IPC分类号： H04R3/00 , H04R25/00 , G10L21/0216
CPC分类号： H04R1/326 , G10L21/0216 , G10L21/0264 , G10L2021/02166 , H04R3/005 , H04R3/04 , H04R25/407 , H04R2410/01 , H04R2410/07 , H04R2430/20 , H04R2430/21 , H04R2430/23
摘要： In one embodiment, a directional microphone array having (at least) two microphones generates forward and backward cardioid signals from two (e.g., omnidirectional) microphone signals. An adaptation factor is applied to the backward cardioid signal, and the resulting adjusted backward cardioid signal is subtracted from the forward cardioid signal to generate a (first-order) output audio signal corresponding to a beampattern having no nulls for negative values of the adaptation factor. After low-pass filtering, spatial noise suppression can be applied to the output audio signal. Microphone arrays having one (or more) additional microphones can be designed to generate second-(or higher-) order output audio signals.
摘要翻译： 在一个实施例中，具有（至少）两个麦克风的定向麦克风阵列产生来自两个（例如全向）麦克风信号的前向和后向心形信号。 将适应因子应用于后向心形信号，并且从前向心形信号中减去所得到的调整的后向心形信号，以产生对应于对于自适应因子的负值而不具有空值的波形图案的（一阶）输出音频信号 。 在低通滤波后，可以对输出音频信号应用空间噪声抑制。 具有一个（或多个）附加麦克风的麦克风阵列可被设计成产生第二（或更高）级的输出音频信号。
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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
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。
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公开(公告)号：US08098844B2
公开(公告)日：2012-01-17
申请号：US12089545
申请日：2006-11-05
申请人： Gary W. Elko
发明人： Gary W. Elko
CPC分类号： H04R3/005 , H04R25/405 , H04R25/407 , H04R2410/07
摘要： Spatial noise suppression for audio signals involves generating a ratio of powers of difference and sum signals of audio signals from two microphones and then performing noise suppression processing, e.g., on the sum signal where the suppression is limited based on the power ratio. In certain embodiments, at least one of the signal powers is filtered (e.g., the sum signal power is equalized) prior to generating the power ratio. In a subband implementation, sum and difference signal powers and corresponding the power ratio are generated for different audio signal subbands, and the noise suppression processing is performed independently for each different subband based on the corresponding subband power ratio, where the amount of suppression is derived independently for each subband from the corresponding subband power ratio. In an adaptive filtering implementation, at least one of the audio signals can be adaptively filtered to allow for array self-calibration and modal-angle variability.
摘要翻译： 用于音频信号的空间噪声抑制涉及产生来自两个麦克风的音频信号的差分和和信号的比率，然后执行噪声抑制处理，例如基于功率比限制抑制的和信号。 在某些实施例中，在产生功率比之前，对信号功率中的至少一个进行滤波（例如，求和信号功率被均衡）。 在子带实现中，针对不同的音频信号子带生成和差信号功率和相应的功率比，并且基于对应的子带功率比，针对每个不同的子带独立地执行噪声抑制处理，其中抑制的量被导出 从每个子带独立地从相应的子带功率比。 在自适应滤波实现中，音频信号中的至少一个可以被自适应地滤波以允许阵列自校准和模态角变化。
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公开(公告)号：US20030147539A1
公开(公告)日：2003-08-07
申请号：US10315502
申请日：2002-12-10
发明人： Gary W. Elko , Robert A. Kubli , Jens M. Meyer
IPC分类号： H04R003/00 , H03G005/00
CPC分类号： H04R5/027 , H04R3/005 , H04R2201/401 , H04S3/00 , H04S2400/15
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 sphere. The number and location of the audio sensors on the sphere 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. Alternative embodiments include using shapes other than spheres, using acoustically soft spheres and/or positioning audio sensors in two or more concentric patterns.
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公开(公告)号：US20190246203A1
公开(公告)日：2019-08-08
申请号：US16383928
申请日：2019-04-15
申请人： MH Acoustics, LLC
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.,
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公开(公告)号：US10356514B2
公开(公告)日：2019-07-16
申请号：US15571525
申请日：2017-06-12
申请人： MH Acoustics, LLC
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.
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