公开(公告)号：US20150078549A1

公开(公告)日：2015-03-19

申请号：US14552723

申请日：2014-11-25

Applicant: Cisco Technology, Inc.

Inventor： James C. Frauenthal ,  Michael A. Ramalho

IPC: H04M3/00

CPC classification number: H04M3/002 ,  H04M3/568 ,  H04M9/082

Abstract: In one embodiment, an echo canceller configured to cancel echo in a wideband voice conference is provided. A double-talk condition may be when a plurality of users are speaking substantially simultaneously. When a double-talk condition is detected in the wideband conference, a high-frequency process is enabled and used to process signals in the high band to reduce echo. Accordingly, echo in the high band may not be produced by end devices being used by the users' speaking. Also, the users speaking have the echo cancelled in the low band and substantial echo does not result. This results in the users speaking experiencing the conference in the narrowband. The other users that are not speaking, however, continue to receive wideband signals. The users not speaking also continue to have echo cancellation performed for the high band and low band because these users are not speaking and thus attenuation of their voices is not a consideration.

公开(公告)号：US09237226B2

公开(公告)日：2016-01-12

申请号：US14552723

申请日：2014-11-25

Applicant: Cisco Technology, Inc.

Inventor： James C. Frauenthal ,  Michael A. Ramalho

IPC: H04M9/08 ,  H04M3/00 ,  H04M3/56

CPC classification number: H04M3/002 ,  H04M3/568 ,  H04M9/082

Abstract: In one embodiment, an echo canceller configured to cancel echo in a wideband voice conference is provided. A double-talk condition may be when a plurality of users are speaking substantially simultaneously. When a double-talk condition is detected in the wideband conference, a high-frequency process is enabled and used to process signals in the high band to reduce echo. Accordingly, echo in the high band may not be produced by end devices being used by the users' speaking. Also, the users speaking have the echo cancelled in the low band and substantial echo does not result. This results in the users speaking experiencing the conference in the narrowband. The other users that are not speaking, however, continue to receive wideband signals. The users not speaking also continue to have echo cancellation performed for the high band and low band because these users are not speaking and thus attenuation of their voices is not a consideration.

Abstract translation: 在一个实施例中，提供了被配置为在宽带语音会议中消除回波的回声消除器。 当多个用户基本上同时进行说话时，双方通话状况可能是这样。 当在宽带会议中检测到双向通话条件时，可以使用高频处理并用于处理高频段中的信号以减少回声。 因此，高频段的回波可能不会被用户所说的终端设备所产生。 另外，说话的用户在低频带中取消了回声，并且不会产生显着的回波。 这导致用户在窄带中体验会议。 然而，不说话的其他用户继续收到宽带信号。 不说话的用户还会对高频带和低频带继续进行回波消除，因为这些用户不会说话，因此声音的衰减不是考虑因素。

公开(公告)号：US09083776B2

公开(公告)日：2015-07-14

申请号：US13867884

申请日：2013-04-22

Applicant: Cisco Technology, Inc.

Inventor： James C. Frauenthal ,  Michael P. O'Brien ,  Michael Anthony Ramalho ,  Gary Alan Skrabutenas ,  Shmuel Shaffer ,  Steven L. Christenson

IPC: H04M9/08 ,  H04M3/00 ,  H04B3/23

CPC classification number: H04M3/002 ,  H04B3/23 ,  H04M9/082

Abstract: In an example embodiment, an example method is provided for echo mitigation in a conference call. In this method, a test audio signal is transmitted to a conference endpoint and as a result, an echo associated with the transmittal of the test audio signal is received. One or more parameters of the echo are then identified and an echo mitigation process is selected from multiple echo mitigation processes based on the identified parameters. The selected echo mitigation process is then applied.

Abstract translation: 在示例实施例中，提供了一种用于电话会议中的回音减轻的示例方法。 在该方法中，将测试音频信号发送到会议端点，结果，接收与发送测试音频信号相关联的回波。 然后识别回波的一个或多个参数，并且基于所识别的参数从多个回波减轻过程中选择回波减轻过程。 然后应用所选的回声减轻过程。

公开(公告)号：US20130230152A1

公开(公告)日：2013-09-05

申请号：US13867884

申请日：2013-04-22

Applicant: CISCO TECHNOLOGY, INC.

Inventor： James C. Frauenthal ,  Michael P. O'Brien ,  Michael Anthony Ramalho ,  Gary Alan Skrabutenas ,  Shmuel Shaffer ,  Steven L. Christenson

IPC: H04M3/00

CPC classification number: H04M3/002 ,  H04B3/23 ,  H04M9/082

Abstract: In an example embodiment, an example method is provided for echo mitigation in a conference call. In this method, a test audio signal is transmitted to a conference endpoint and as a result, an echo associated with the transmittal of the test audio signal is received. One or more parameters of the echo are then identified and an echo mitigation process is selected from multiple echo mitigation processes based on the identified parameters. The selected echo mitigation process is then applied.

Abstract translation: 在示例实施例中，提供了一种用于电话会议中的回音减轻的示例方法。 在该方法中，将测试音频信号发送到会议端点，结果，接收与发送测试音频信号相关联的回波。 然后识别回波的一个或多个参数，并且基于所识别的参数从多个回波减轻过程中选择回波减轻过程。 然后应用所选的回声减轻过程。