公开(公告)号：US10938992B1

公开(公告)日：2021-03-02

申请号：US16404468

申请日：2019-05-06

Applicant: Polycom, Inc.

Inventor： Kwan Truong ,  Peter L. Chu

IPC: H04M3/56 ,  G10L21/0208 ,  H03H21/00 ,  H04R29/00 ,  G06F3/16

Abstract: Traditional audio feedback elimination systems may attempt to reduce the effect of the audio feedback by simply scaling down the audio volume of the signal frequencies that are prone to howling. Other traditional feedback elimination systems may also employ adaptive notch filtering to detect and “notch” the so-called “singing” or “howling” frequencies as they occur in real-time. Such devices may typically have several knobs and buttons needing tuning, for example: the number of adaptive parametric equalizers (PEQs) versus fixed PEQs; attack and decay timers; and/or PEQ bandwidth. Rather than removing the singing frequencies with PEQs, the devices described herein attempt to holistically model the feedback audio and then remove the entire feedback signal. Two advantages of the devices described herein are: 1.) the system can operate at a much larger loop-gain (and hence with a much higher loudspeaker volume); and 2) setup is greatly simplified (i.e., no tuning knobs or buttons).

公开(公告)号：US20210037210A1

公开(公告)日：2021-02-04

申请号：US16931169

申请日：2020-07-16

Applicant: Polycom, Inc.

Inventor： Peter L. Chu ,  Yibo Liu

IPC: H04N7/15 ,  H04N7/14 ,  H04M3/56 ,  G06F3/16

Abstract: A videoconferencing system has a videoconferencing unit that use portable devices as peripherals for the system. The portable devices obtain near-end audio and send the audio to the videoconferencing unit via a wireless connection. In turn, the videoconferencing unit sends the near-end audio from the loudest portable device along with near-end video to the far-end. The portable devices can control the videoconferencing unit and can initially establish the videoconference by connecting with the far-end and then transferring operations to the videoconferencing unit. To deal with acoustic coupling between the unit's loudspeaker and the portable device's microphone, the unit uses an echo canceller that is compensated for differences in the clocks used in the A/D and D/A converters of the loudspeaker and microphone.

公开(公告)号：US10097794B2

公开(公告)日：2018-10-09

申请号：US15395492

申请日：2016-12-30

Applicant: Polycom, Inc.

Inventor： Peter L. Chu ,  Yibo Liu

IPC: H04N7/14 ,  H04N7/15 ,  G06F3/16 ,  H04M3/56

Abstract: A videoconferencing system has a videoconferencing unit that use portable devices as peripherals for the system. The portable devices obtain near-end audio and send the audio to the videoconferencing unit via a wireless connection. In turn, the videoconferencing unit sends the near-end audio from the loudest portable device along with near-end video to the far-end. The portable devices can control the videoconferencing unit and can initially establish the videoconference by connecting with the far-end and then transferring operations to the videoconferencing unit. To deal with acoustic coupling between the unit's loudspeaker and the portable device's microphone, the unit uses an echo canceller that is compensated for differences in the clocks used in the A/D and D/A converters of the loudspeaker and microphone.

公开(公告)号：US20130294612A1

公开(公告)日：2013-11-07

申请号：US13865001

申请日：2013-04-17

Applicant: Polycom, Inc.

Inventor： Jinwei Feng ,  Peter L. Chu

IPC: H04R3/00

CPC classification number: H04R3/005 ,  H04N7/15 ,  H04R3/02 ,  H04R2430/01

Abstract: Methods and systems for cancelation of table noise in a speaker system used for video or audio conferencing are disclosed. Table noise is cancelled by using a vertical microphone array to distinguish the tilt angle of sound received by a microphone. If the sound is close to horizontal, the audio is muted. If the sound is above a given angle from horizontal, it is not muted, as this indicates a person speaking. This eliminates paper rustling, keyboard clicks and the like.

Abstract translation: 公开了用于视频或音频会议的扬声器系统中用于消除表噪声的方法和系统。 通过使用垂直麦克风阵列来消除麦克风接收的声音的倾斜角来消除表噪声。 如果声音接近水平，则音频静音。 如果声音高于水平的给定角度，则不会静音，因为这表示一个人在说话。 这消除了纸沙沙声，键盘敲击等。

公开(公告)号：US11228834B2

公开(公告)日：2022-01-18

申请号：US17085581

申请日：2020-10-30

Applicant: Polycom, Inc.

Inventor： Kwan K. Truong ,  Peter L. Chu ,  Steven L. Potts ,  Eric Elias

IPC: H04R3/00 ,  G10L21/0208 ,  G10L21/0216 ,  H04R3/04 ,  H04R5/027 ,  H04R5/04 ,  H04R27/00

Abstract: The amount of far-field noise transmitted by a primary communication device in an open-plan office environment is reduced by defining an acoustic perimeter of reference microphones around the primary device. Reference microphones generate a reference audio input including far-field noise in the proximity of the primary device. The primary device generates a main audio input including the voice of the primary speaker as well as background noise. Reference audio input is compared to main audio input to identify the background noise portion of the main audio signal. A noise reduction algorithm suppresses the identified background noise in the main audio signal. The one or more reference microphones defining the acoustic perimeter may be included in separate microphone devices placed in proximity to the main desktop phone, microphones within other nearby desktop telephone devices, or a combination of both types of devices.

公开(公告)号：US10819857B1

公开(公告)日：2020-10-27

申请号：US16253770

申请日：2019-01-22

Applicant: Polycom, Inc.

Inventor： Peter L. Chu

IPC: H04M9/08

Abstract: An endpoint receives audio from a remote endpoint. A first signal corresponding to the audio is received at an adaptive filter, and a filtered signal is generated. First audio is emitted at a loudspeaker based on the first signal. A microphone collects second audio which is based on the first audio. The microphone signal emits a signal based on the second audio. The filtered signal is subtracted from microphone signal to generate an adapted signal, the adapted signal having an energy level. The adapted signal is then transmitted to a double-talk detector, the double-talk detector configured to allow transmission of the adapted signal to the remote endpoint when the energy level of the adapted signal exceeds an energy threshold. The degree of cross-correlation between the first signal and the adapted signal is determined (iteratively). If the cross-correlation exceeds a cross-correlation threshold, the energy threshold of the double-talk detector is raised.

公开(公告)号：US10455326B2

公开(公告)日：2019-10-22

申请号：US16144202

申请日：2018-09-27

Applicant: Polycom, Inc.

Inventor： Kwan Truong ,  Peter L. Chu

IPC: H04R3/02 ,  H03G5/02 ,  G11B27/031 ,  H04R27/00 ,  H03G5/16

Abstract: Traditional audio feedback elimination systems may attempt to reduce the effect of the audio feedback by simply scaling down the audio volume of the signal frequencies that are prone to howling. Other traditional feedback elimination systems may also employ adaptive notch filtering to detect and “notch” the so-called “singing” or “howling” frequencies as they occur in real-time. Such devices may typically have several knobs and buttons needing tuning, for example: the number of adaptive parametric equalizers (PEQs) versus fixed PEQs; attack and decay timers; and/or PEQ bandwidth. Rather than removing the singing frequencies with PEQs, the devices described herein attempt to holistically model the feedback audio and then remove the entire feedback signal. Two advantages of the devices described herein are: 1.) the system can operate at a much larger loop-gain (and hence with a much higher loudspeaker volume); and 2) setup is greatly simplified (i.e., no tuning knobs or buttons).

公开(公告)号：US20190042187A1

公开(公告)日：2019-02-07

申请号：US15670572

申请日：2017-08-07

Applicant: Polycom, Inc.

Inventor： Kwan Truong ,  Yibo Liu ,  Peter L. Chu ,  Zhemin Tu ,  Jesse Coleman ,  Cody Schnacker ,  Andrew Lochbaum

IPC: G06F3/16 ,  H04L12/28 ,  G10L17/24 ,  G10L15/30 ,  G06F21/32

Abstract: A method includes, during a teleconference between a first audio input/output device and a second audio input/output device, receiving, at an analysis and response device, a signal indicating a spoken command, the spoken command associated with a command mode. The method further includes, in response to receiving the signal, generating, at the device, a reply message based on the spoken command, the reply message to be output to one or more devices selected based on the command mode. The one or more devices includes the first audio input/output device, the second audio input/output device, or a combination thereof.

公开(公告)号：US09544541B2

公开(公告)日：2017-01-10

申请号：US14673477

申请日：2015-03-30

Applicant: Polycom, Inc.

Inventor： Peter L. Chu ,  Yibo Liu

IPC: H04N7/14 ,  H04N7/15 ,  H04M3/56 ,  G06F3/16

CPC classification number: H04N7/15 ,  G06F3/165 ,  H04M3/568 ,  H04N7/142

Abstract: A videoconferencing system has a videoconferencing unit that use portable devices as peripherals for the system. The portable devices obtain near-end audio and send the audio to the videoconferencing unit via a wireless connection. In turn, the videoconferencing unit sends the near-end audio from the loudest portable device along with near-end video to the far-end. The portable devices can control the videoconferencing unit and can initially establish the videoconference by connecting with the far-end and then transferring operations to the videoconferencing unit. To deal with acoustic coupling between the unit's loudspeaker and the portable device's microphone, the unit uses an echo canceller that is compensated for differences in the clocks used in the A/D and D/A converters of the loudspeaker and microphone.

Abstract translation: 视频会议系统具有视频会议单元，其使用便携式设备作为系统的外围设备。 便携式设备获得近端音频，并通过无线连接将音频发送到视频会议单元。 反过来，视频会议单元将最接近便携式设备的近端音频和近端视频一起发送到远端。 便携式设备可以控制视频会议单元，并且可以通过与远端连接然后将操作传送到视频会议单元来最初建立视频会议。 为了处理单元的扬声器和便携式设备的麦克风之间的声耦合，该单元使用回波消除器，其被补偿在扬声器和麦克风的A / D和D / A转换器中使用的时钟的差异。

公开(公告)号：US09538135B2

公开(公告)日：2017-01-03

申请号：US14673482

申请日：2015-03-30

Applicant: Polycom, Inc.

Inventor： Peter L. Chu ,  Yibo Liu

IPC: H04N7/14 ,  H04N7/15 ,  H04M3/56 ,  G06F3/16

CPC classification number: H04N7/15 ,  G06F3/165 ,  H04M3/568 ,  H04N7/142

Abstract: A videoconferencing system has a videoconferencing unit that use portable devices as peripherals for the system. The portable devices obtain near-end audio and send the audio to the videoconferencing unit via a wireless connection. In turn, the videoconferencing unit sends the near-end audio from the loudest portable device along with near-end video to the far-end. The portable devices can control the videoconferencing unit and can initially establish the videoconference by connecting with the far-end and then transferring operations to the videoconferencing unit. To deal with acoustic coupling between the unit's loudspeaker and the portable device's microphone, the unit uses an echo canceller that is compensated for differences in the clocks used in the A/D and D/A converters of the loudspeaker and microphone.

Abstract translation: 视频会议系统具有视频会议单元，其使用便携式设备作为系统的外围设备。 便携式设备获得近端音频，并通过无线连接将音频发送到视频会议单元。 反过来，视频会议单元将最接近便携式设备的近端音频和近端视频一起发送到远端。 便携式设备可以控制视频会议单元，并且可以通过与远端连接然后将操作传送到视频会议单元来最初建立视频会议。 为了处理单元的扬声器和便携式设备的麦克风之间的声耦合，该单元使用回波消除器，其补偿扬声器和麦克风的A / D和D / A转换器中使用的时钟的差异。