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公开(公告)号：US11205437B1
公开(公告)日：2021-12-21
申请号：US16216741
申请日：2018-12-11
Applicant: Amazon Technologies, Inc.
Inventor： Xianxian Zhang , Ramya Gopalan
IPC: G10L21/0232 , H04R1/40 , H04R29/00 , G10L25/21 , H04R3/00 , G10L21/0208
Abstract: Techniques for improving acoustic echo cancellation are described. Energy levels of audio data received from a microphone and representing near-end audio and reference audio data representing far-end audio are determined. If near-end audio is detected but far-end audio is not detected, a controller turns of or bypasses an acoustic echo cancellation system until far-end audio is again detected, thereby decreasing or eliminating distortion of the near-end audio by the acoustic echo cancellation system.
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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
Applicant: Amazon Technologies, Inc.
Inventor： Jeffrey Cornelius O'Neill , Amit Singh Chhetri , Philip Ryan Hilmes , Ramya Gopalan
Abstract: 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：US10242695B1
公开(公告)日：2019-03-26
申请号：US15704285
申请日：2017-09-14
Applicant: Amazon Technologies, Inc.
Inventor： Kavitha Velusamy , Wai C. Chu , Ramya Gopalan , Amit S. Chhetri
IPC: G06K9/00 , H04B3/23 , G10L25/78 , H04N21/442
Abstract: Techniques for enhancing an acoustic echo canceller based on visual cues are described herein. The techniques include changing adaptation of a filter of the acoustic echo canceller, calibrating the filter, or reducing background noise from an audio signal processed by the acoustic echo canceller. The changing, calibrating, and reducing are responsive to visual cues that describe acoustic characteristics of a location of a device that includes the acoustic echo canceller. Such visual cues may indicate that no human being is present at the location, that some subject(s) are engaged in speaking or sound generating activities, or that motion associated with an echo path change has occurred at the location.
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公开(公告)号：US10026399B2
公开(公告)日：2018-07-17
申请号：US14852022
申请日：2015-09-11
Applicant: Amazon Technologies, Inc.
Inventor： Ramya Gopalan , Shiva Kumar Sundaram
IPC: G10L21/00 , G10L15/22 , G06F3/16 , G10L21/0216
Abstract: Architectures and techniques for selecting a voice-enabled device to handle audio input that is detected by multiple voice-enabled devices are described herein. In some instances, multiple voice-enabled devices may detect audio input from a user at substantially the same time, due to the voice-enabled devices being located within proximity to the user. The architectures and techniques may analyze a variety of audio signal metric values for the voice-enabled devices to designate a voice-enabled device to handle the audio input.
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公开(公告)号：US11624800B1
公开(公告)日：2023-04-11
申请号：US17501093
申请日：2021-10-14
Applicant: Amazon Technologies, Inc.
Inventor： William Folwell Barton , Kenneth Edgar Hild, II , Ramya Gopalan , Kavitha Velusamy , Amit Singh Chhetri
Abstract: 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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Patent Agency Ranking
公开(公告)号：US11175372B1
公开(公告)日：2021-11-16
申请号：US16925046
申请日：2020-07-09
Applicant: Amazon Technologies, Inc.
Inventor： William Folwell Barton , Kenneth Edgar Hild, II , Ramya Gopalan , Kavitha Velusamy , Amit Singh Chhetri
Abstract: 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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公开(公告)号：US10863270B1
公开(公告)日：2020-12-08
申请号：US16361808
申请日：2019-03-22
Applicant: Amazon Technologies, Inc.
Inventor： Jeffrey Cornelius O'Neill , Amit Singh Chhetri , Philip Ryan Hilmes , Ramya Gopalan
Abstract: 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：US20170076720A1
公开(公告)日：2017-03-16
申请号：US14852022
申请日：2015-09-11
Applicant: Amazon Technologies, Inc.
Inventor： Ramya Gopalan , Shiva Kumar Sundaram
CPC classification number: G10L15/22 , G06F3/167 , G10L2015/223 , G10L2021/02166
Abstract: Architectures and techniques for selecting a voice-enabled device to handle audio input that is detected by multiple voice-enabled devices are described herein. In some instances, multiple voice-enabled devices may detect audio input from a user at substantially the same time, due to the voice-enabled devices being located within proximity to the user. The architectures and techniques may analyze a variety of audio signal metric values for the voice-enabled devices to designate a voice-enabled device to handle the audio input.
Abstract translation: 这里描述了用于选择支持语音的设备来处理由多个支持语音的设备检测到的音频输入的体系结构和技术。 在某些情况下，由于支持语音的设备位于与用户接近的位置，所以多个支持语音的设备可以基本上同时检测来自用户的音频输入。 架构和技术可以分析用于支持语音的设备的各种音频信号度量值，以指定支持语音的设备来处理音频输入。
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公开(公告)号：US10388298B1
公开(公告)日：2019-08-20
申请号：US15585486
申请日：2017-05-03
Applicant: Amazon Technologies, Inc.
Inventor： Ramya Gopalan , Carlo Murgia , Sridhar Pilli
IPC: G10L21/0208 , H04M9/08 , G10L21/0232 , H04B3/23 , H04B3/466 , G10L21/00 , H04B3/20
Abstract: A system configured to improve speech quality by performing residual echo suppression (RES). The system may detect when double talk is present in a voice conversation and may use different attenuation parameters based on a frequency of audio data. The system may perform RES on the audio data using a low attenuation value for low frequencies and a high attenuation value for high frequencies and determine that double talk is present when a difference in energy level between the low frequencies and the high frequencies is below a threshold. If double talk is present, the RES may generate output audio data using a low attenuation value for low frequencies and a high attenuation value for high frequencies. If double talk is not present, the RES may generate output audio data using a high attenuation value for low frequencies and a high attenuation value for high frequencies.
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公开(公告)号：US09837099B1
公开(公告)日：2017-12-05
申请号：US15250659
申请日：2016-08-29
Applicant: Amazon Technologies, Inc.
Inventor： Shiva Sundaram , Amit Singh Chhetri , Ramya Gopalan , Philip Ryan Hilmes
IPC: H04R3/00 , G10L21/028 , G10L25/84 , G10L25/72 , G10L21/0216
CPC classification number: G10L21/028 , G10L25/72 , G10L25/84 , G10L2021/02166 , H04R1/406 , H04R3/005 , H04R25/405 , H04R25/407 , H04R2430/23
Abstract: Embodiments of systems and methods are described for determining which of a plurality of beamformed audio signals to select for signal processing. In some embodiments, a plurality of audio input signals are received from a microphone array comprising a plurality of microphones. A plurality of beamformed audio signals are determined based on the plurality of input audio signals, the beamformed audio signals comprising a direction. A plurality of signal features may be determined for each beamformed audio signal. Smoothed features may be determined for each beamformed audio signal based on at least a portion of the plurality of signal features. The beamformed audio signal corresponding to the maximum smoothed feature may be selected for further processing.
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