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公开(公告)号：US09838784B2
公开(公告)日：2017-12-05
申请号：US14957447
申请日：2015-12-02
Applicant: Knowles Electronics, LLC
Inventor： Harinarayanan Erumbi Vallabhan , Shailesh Sakri , Carlos Avendano , Ludger Solbach
CPC classification number: H04R3/005 , H04M1/03 , H04R2201/405 , H04R2430/20 , H04R2430/21
Abstract: Systems and methods for improving performance of a directional audio capture system are provided. An example method includes correlating phase plots of at least two audio inputs, with the audio inputs being captured by at least two microphones. The method can further include generating, based on the correlation, estimates of salience at different directional angles to localize a direction of a source of sound. The method can allow providing cues to the directional audio capture system based on the estimates. The cues include attenuation levels. A rate of change of the levels of attenuation is controlled by attack and release time constants to avoid sound artifacts. The method also includes determining a mode based on an absence or presence of one or more peaks in the estimates of salience. The method also provides for configuring the directional audio capture system based on the determined mode.
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公开(公告)号：US09820042B1
公开(公告)日：2017-11-14
申请号：US15144631
申请日：2016-05-02
Applicant: Knowles Electronics, LLC
Inventor： Jonathon Ray , John Woodruff , Shailesh Sakri , Tony Verma
CPC classification number: H04R3/005 , H04R1/326 , H04R2430/20 , H04R2499/11 , H04R2499/15 , H04S1/002
Abstract: Systems and methods for stereo separation and directional suppression are provided. An example method includes receiving a first audio signal, representing sound captured by a first microphone associated with a first location, and a second audio signal, representing sound captured by a second microphone associated with a second location. The microphones comprise omni-directional microphones. The distance between the first and second microphones is limited by the size of a mobile device. A first channel signal of a stereo signal is generated by forming, based on the first and second audio signals, a first beam at the first location. A second channel signal of the stereo signal is generated by forming, based on the first and second audio signals, a second beam at the second location. First and second directions, associated respectively with the first and second beams, are fixed relative to a line between the first and second locations.
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Patent Agency Ranking
公开(公告)号：US10257611B2
公开(公告)日：2019-04-09
申请号：US15806766
申请日：2017-11-08
Applicant: Knowles Electronics, LLC
Inventor： Jonathon Ray , John Woodruff , Shailesh Sakri , Tony Verma
Abstract: Systems and methods for stereo separation and directional suppression are provided. An example method includes receiving a first audio signal, representing sound captured by a first microphone associated with a first location, and a second audio signal, representing sound captured by a second microphone associated with a second location. The microphones comprise omni-directional microphones. The distance between the first and second microphones is limited by the size of a mobile device. A first channel signal of a stereo signal is generated by forming, based on the first and second audio signals, a first beam at the first location. A second channel signal of the stereo signal is generated by forming, based on the first and second audio signals, a second beam at the second location. First and second directions, associated respectively with the first and second beams, are fixed relative to a line between the first and second locations.
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公开(公告)号：US20180070174A1
公开(公告)日：2018-03-08
申请号：US15806766
申请日：2017-11-08
Applicant: Knowles Electronics, LLC
Inventor： Jonathon Ray , John Woodruff , Shailesh Sakri , Tony Verma
CPC classification number: H04R3/005 , H04R1/326 , H04R2430/20 , H04R2499/11 , H04R2499/15 , H04S1/002
Abstract: Systems and methods for stereo separation and directional suppression are provided. An example method includes receiving a first audio signal, representing sound captured by a first microphone associated with a first location, and a second audio signal, representing sound captured by a second microphone associated with a second location. The microphones comprise omni-directional microphones. The distance between the first and second microphones is limited by the size of a mobile device. A first channel signal of a stereo signal is generated by forming, based on the first and second audio signals, a first beam at the first location. A second channel signal of the stereo signal is generated by forming, based on the first and second audio signals, a second beam at the second location. First and second directions, associated respectively with the first and second beams, are fixed relative to a line between the first and second locations.
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公开(公告)号：US20170318387A1
公开(公告)日：2017-11-02
申请号：US15144631
申请日：2016-05-02
Applicant: Knowles Electronics, LLC
Inventor： Jonathon Ray , John Woodruff , Shailesh Sakri , Tony Verma
CPC classification number: H04R3/005 , H04R1/326 , H04R2430/20 , H04R2499/11 , H04R2499/15 , H04S1/002
Abstract: Systems and methods for stereo separation and directional suppression are provided. An example method includes receiving a first audio signal, representing sound captured by a first microphone associated with a first location, and a second audio signal, representing sound captured by a second microphone associated with a second location. The microphones comprise omni-directional microphones. The distance between the first and second microphones is limited by the size of a mobile device. A first channel signal of a stereo signal is generated by forming, based on the first and second audio signals, a first beam at the first location. A second channel signal of the stereo signal is generated by forming, based on the first and second audio signals, a second beam at the second location. First and second directions, associated respectively with the first and second beams, are fixed relative to a line between the first and second locations.
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公开(公告)号：US09668048B2
公开(公告)日：2017-05-30
申请号：US15011287
申请日：2016-01-29
Applicant: Knowles Electronics, LLC
Inventor： Shailesh Sakri , Ajay Kumar Dhanapalan , Harsha Inna Kedage Rao
CPC classification number: H04R3/005 , H04M9/08 , H04R2410/05 , H04R2499/11
Abstract: Provided are systems and methods for contextual switching of microphones in audio devices. An example method includes detecting a change in conditions for capturing an acoustic signal by at least two microphones. A configuration is associated with the at least two microphones. The example method provides determining that the change in conditions has been stable for a pre-determined period of time. In response to the determination, the method changes the configuration associated with the at least two microphones. The conditions may include an absence or presence of far-end speech, reverberation, low/high signal-to-noise ratio, low/high signal-to-echo ratio, type of background noise, and so on. The changing of the configuration includes assigning a primary microphone and a secondary microphone based on a change in conditions. Based on the changed configuration, tuning parameters may be adjusted for noise suppression and acoustic echo cancellation.
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公开(公告)号：US20160227336A1
公开(公告)日：2016-08-04
申请号：US15011287
申请日：2016-01-29
Applicant: Knowles Electronics, LLC
Inventor： Shailesh Sakri , Ajay Kumar Dhanapalan , Harsha Inna Kedage Rao
CPC classification number: H04R3/005 , H04M9/08 , H04R2410/05 , H04R2499/11
Abstract: Provided are systems and methods for contextual switching of microphones in audio devices. An example method includes detecting a change in conditions for capturing an acoustic signal by at least two microphones. A configuration is associated with the at least two microphones. The example method provides determining that the change in conditions has been stable for a pre-determined period of time. In response to the determination, the method changes the configuration associated with the at least two microphones. The conditions may include an absence or presence of far-end speech, reverberation, low/high signal-to-noise ratio, low/high signal-to-echo ratio, type of background noise, and so on. The changing of the configuration includes assigning a primary microphone and a secondary microphone based on a change in conditions. Based on the changed configuration, tuning parameters may be adjusted for noise suppression and acoustic echo cancellation.
Abstract translation: 提供了用于音频设备中麦克风的背景切换的系统和方法。 示例性方法包括通过至少两个麦克风来检测用于捕获声信号的条件变化。 配置与至少两个麦克风相关联。 该示例方法提供确定条件的变化在预定时间段内是稳定的。 响应于该确定，该方法改变与至少两个麦克风相关联的配置。 条件可能包括远端语音的缺失或存在，混响，低/高信噪比，低/高信号与回波比，背景噪声类型等。 配置的改变包括基于条件的改变来分配主麦克风和次麦克风。 基于改变的配置，可以调整调谐参数用于噪声抑制和声学回声消除。
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