公开(公告)号：US20210051300A1

公开(公告)日：2021-02-18

申请号：US17084200

申请日：2020-10-29

Applicant: Polycom, Inc.

Inventor： Peter L. Chu ,  Yibo Liu

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

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：US10856077B2

公开(公告)日：2020-12-01

申请号：US16927667

申请日：2020-07-13

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：US20200344546A1

公开(公告)日：2020-10-29

申请号：US16927667

申请日：2020-07-13

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

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：US10757364B2

公开(公告)日：2020-08-25

申请号：US16378557

申请日：2019-04-08

Applicant: Polycom, Inc.

Inventor： Peter L. Chu ,  Yibo Liu

IPC: H04N7/14 ,  H04N7/15 ,  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：US10555080B2

公开(公告)日：2020-02-04

申请号：US16376904

申请日：2019-04-05

Applicant: Polycom, Inc.

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

IPC: H04R3/00 ,  H04R27/00 ,  G10L21/0216

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：US20190373217A1

公开(公告)日：2019-12-05

申请号：US16378557

申请日：2019-04-08

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：US10389325B1

公开(公告)日：2019-08-20

申请号：US16196220

申请日：2018-11-20

Applicant: Polycom, Inc.

Inventor： Peter L. Chu

IPC: H03G5/16 ,  H04R1/40 ,  H04R3/00 ,  G10L25/21 ,  G10L21/038

Abstract: The spectral response of an omnidirectional microphone is used as a reference. This reference is compared to the spectral response of each directional microphone to develop scale factors that are applied to the directional microphone spectral response to perform spectral equalization. The outputs of the omnidirectional microphone and the directional microphones are decomposed into a series of sub-bands and the comparison and equalization is done for each sub-band. The equalized sub-bands are then converted into a time domain signal for further processing by the conference phone or video conference system.

公开(公告)号：US20180359447A1

公开(公告)日：2018-12-13

申请号：US16105894

申请日：2018-08-20

Applicant: Polycom, Inc.

Inventor： Peter L. Chu ,  Yibo Liu

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

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.

公开(公告)号：US10154148B1

公开(公告)日：2018-12-11

申请号：US15667910

申请日：2017-08-03

Applicant: Polycom, Inc.

Inventor： Peter L. Chu ,  Eric Elias

IPC: H04M9/08 ,  G10L21/0208 ,  H04M3/00 ,  H04M3/56 ,  H04N7/15

Abstract: A conferencing endpoint includes a loudspeaker, a base microphone, and a double-talk detection module which allows two-way communication between the conferencing endpoint and a remote endpoint only when participants at both endpoints are speaking at the same time, so as to minimize echo due to feedback. The double-talk detection module adds the energy of any distortion from the loudspeaker to the energy of the signal coming from the remote endpoint, and compares this combined energy with the energy of the base microphone to determine whether double-talk is present. The double-talk detection module is thus prevented from mistaking the feedback for near end talk at the endpoint.

公开(公告)号：US10117021B1

公开(公告)日：2018-10-30

申请号：US15942148

申请日：2018-03-30

Applicant: Polycom, Inc.

Inventor： Kwan Truong ,  Peter L. Chu

IPC: H04R3/02 ,  H03G5/02 ,  G11B27/031

Abstract: Systems and methods for holistically modelling audio feedback and removing the entire feedback signal corresponding thereto. The systems can operate at a much larger loop-gain (and hence with a much higher loudspeaker volume), than those conventional systems which seek to remove singing frequencies with PEQs. The systems are an improvement over traditional audio feedback elimination systems which 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, and those feedback elimination systems which simply 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. The systems set forth herein obviate the need for tuning knobs or buttons, making set up easy.