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公开(公告)号：US11646009B1
公开(公告)日：2023-05-09
申请号：US16902476
申请日：2020-06-16
发明人： Amit Singh Chhetri , Navin Chatlani
IPC分类号： G10L25/84 , G10K11/175 , G10L15/16
CPC分类号： G10K11/1752 , G10L15/16 , G10L25/84
摘要： A device capable of autonomous motion may move in an environment and may receive audio data from a microphone. A model may be trained to process the audio data to determine mask data, which may be used to mask noise in the audio data. Training data for the model may be normalized before training, and different loss functions may be used for different types of training data.
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公开(公告)号：US10244313B1
公开(公告)日：2019-03-26
申请号：US15247670
申请日：2016-08-25
摘要： A wearable computer is configured to use beamforming techniques to isolate a user's speech from extraneous audio signals occurring within a physical environment. A microphone array of the wearable computer may generate audio signal data from an utterance from a user's mouth. A motion sensor(s) of the wearable computer may generate motion data from movement of the wearable computer. This motion data may be used to determine a direction vector pointing from the wearable computer to the user's mouth, and a beampattern may be defined that has a beampattern direction in substantial alignment with the determined direction vector to focus the microphone array on the user's mouth for speech isolation.
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公开(公告)号：US11258478B1
公开(公告)日：2022-02-22
申请号：US16573679
申请日：2019-09-17
摘要： A device capable of autonomous motion includes a residual echo suppressor for suppressing echoes caused by an output reference signal. When the device outputs audio while moving with a velocity, it may receive echoes that are Doppler-shifted due to the motion. The residual echo suppressor generates estimated residual error data based on phase-shifted reference data to account for and suppress the Doppler-shifted echoes.
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公开(公告)号：US10229698B1
公开(公告)日：2019-03-12
申请号：US15629155
申请日：2017-06-21
发明人： Amit Singh Chhetri
IPC分类号： G10L21/0208 , G10L21/0216
摘要： An acoustic interference cancellation system that combines acoustic echo cancellation and an adaptive beamformer to cancel acoustic interference from an audio output. The system uses a fixed beamformer to generate a target signal in a look direction and an adaptive beamformer to generate noise reference signals corresponding to non-look directions. The noise reference signals are used to estimate acoustic noise using an acoustic interference canceller (AIC), while reference signals associated with loudspeakers are used to estimate an acoustic echo using a multi-channel acoustic echo canceller (MC-AEC). The system cancels the acoustic echo and the acoustic noise simultaneously by adding the estimate of the acoustic noise and the estimate of the acoustic echo to generate an interference reference signal and cancelling the interference reference signal from the target signal. The system jointly updates adaptive filters for the AIC and the MC-AEC logic to improve a robustness of the system.
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公开(公告)号：US09978387B1
公开(公告)日：2018-05-22
申请号：US13959377
申请日：2013-08-05
IPC分类号： G10L21/02
CPC分类号： G10L21/02 , G10L15/00 , G10L21/0208 , G10L2021/02082 , G10L2021/02165
摘要： An audio device may have an output speaker that produces audio within the environment of a user and one or more input microphones that capture speech and other sounds from the user environment. The audio device may use acoustic echo cancellation (AEC) to suppress echoed components of the speaker output that may be present in audio captured by the input microphones. The AEC may be implemented using an adaptive filter that estimates echoing based on an output reference signal. The output reference signal may be generated by a reference microphone placed near the speaker of the audio device.
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公开(公告)号：US09973849B1
公开(公告)日：2018-05-15
申请号：US15710382
申请日：2017-09-20
CPC分类号： H04R3/005 , H04M3/2236 , H04R29/005 , H04R2410/01
摘要： A device that includes a first beam selection component that selects a portion of the multiple beams prior to performing adaptive noise cancellation, in addition to a second beam selection component that selects a beam after adaptive noise cancellation is performed. The device only performs adaptive noise cancellation on the portion of the multiple beams that are selected, reducing a complexity of performing adaptive noise cancellation. In addition, as the first beam selection component selects from the multiple beams before adaptive noise cancellation, the quality of the signals are not reduced and/or desired signals are not suppressed, resulting in the first beam selection component increasing a likelihood that the second beam selection component selects the desired beam. The first beam selection component may use a different algorithm and/or selection criteria than the second beam selection component in order to select beams associated with desired signals such as speech.
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公开(公告)号：US08953777B1
公开(公告)日：2015-02-10
申请号：US13906076
申请日：2013-05-30
发明人： Amit Singh Chhetri
CPC分类号： H04M3/002 , H04B3/234 , H04M1/6041 , H04M9/082
摘要： An echo path change detector may be used to control the rate of adaptation in an acoustic echo canceller. When echo path change is declared, the rate of adaptation may be increased. However, echo path change should not be declared in the presence of double talk, because rapid adaptation during double talk is undesirable. Accordingly, various features are disclosed for detecting echo path changes while avoiding the declaration of such changes in the presence of double talk.
摘要翻译： 回波路径改变检测器可用于控制声学回波消除器中的适应速率。 当声明回波路径更改时，可能会增加适配速率。 然而，由于在双重通话中的快速适应是不希望的，所以在双重通话中不应该声明回波路径改变。 因此，公开了用于检测回波路径变化的各种特征，同时避免在存在双重通话的情况下声明这种变化。
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公开(公告)号：US11854564B1
公开(公告)日：2023-12-26
申请号：US16902731
申请日：2020-06-16
发明人： Navin Chatlani , Amit Singh Chhetri
摘要： A device capable of autonomous motion may move in an environment and may receive audio data from a microphone. A model may be trained to process the audio data to suppress noise from the audio data. The model may include an encoder that includes one or more convolutional layers, one or more recurrent layers, and a decoder that includes one or more convolutional layers.
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公开(公告)号：US11425494B1
公开(公告)日：2022-08-23
申请号：US16439139
申请日：2019-06-12
发明人： Navin Chatlani , Amit Singh Chhetri
IPC分类号： G10L21/02 , H04R1/40 , G06F3/16 , G05D1/00 , G05D1/02 , G10L15/22 , G10L15/20 , G10L21/0208 , G10L25/78 , G10L21/0216
摘要： A device capable of motion includes a beamformer for determining audio data corresponding to one or more directions. The beamformer includes a target beamformer that boosts audio from a target direction and a null beamformer that suppresses audio from that direction. When the device outputs sound while moving, the target and null beamformers capture and compensate for Doppler effects in output audio that reflects from nearby surfaces back to the device.
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公开(公告)号：US10746840B1
公开(公告)日：2020-08-18
申请号：US15601981
申请日：2017-05-22
发明人： William Folwell Barton , Kenneth Edgar Hild, II , Ramya Gopalan , Kavitha Velusamy , Amit Singh Chhetri
摘要： The systems, devices, and processes described herein may identify a beam of a voice-controlled device that is directed toward a reflective surface, such as a wall. The beams may be created by a beamformer. An acoustic echo canceller (AEC) may create filter coefficients for a reference sound. The filter coefficients may be analyzed to identify beams that include multiple peaks. The multiple peaks may indicate presence of one or more reflective surfaces. Using the amplitude and the time delay between the peaks, the device may determine that it is close to a reflective surface in a direction of the beam.
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