公开(公告)号：US07646763B2

公开(公告)日：2010-01-12

申请号：US10961616

申请日：2004-10-08

申请人： David Cheng-Song Qi ,  Yan Wang ,  Timothy G. Wade

发明人： David Cheng-Song Qi ,  Yan Wang ,  Timothy G. Wade

IPC分类号： H04L12/66

CPC分类号： H04L12/66

摘要： High compression rate codecs in gateways servicing Voice-over-Internet Protocol (VoIP) and Voice Band Data (VBD) calls distort modem/fax Answer Back Tones (e.g., 2100 Hz), which may lead to signal distortion and call hang-ups. To prevent such occurrences, a method or corresponding apparatus forces originating and terminating gateways to stay in a low complexity non-voice compression codec (e.g., ITU G.711) after prenegotiating a high complexity, voice compression codec (e.g., G.729 or G.726) during a short beginning period of a voice call. The low complexity codec avoids distorted answer back tone leakage associated with previous solutions that use a notch filter to block the leakage, thereby significantly improving the success rate of a VBD call by completely eliminating modem answer back tone distortion caused by high complexity codecs that use voice compression and by completely eliminating use of the notch filter.

摘要翻译： 通过互联网语音协议（VoIP）和语音频带数据（VBD）的网关中的高压缩率编解码器调用可能导致信号失真和呼叫挂断的调制解调器/传真回答音（例如，2100 Hz）。 为了防止这种情况发生，在预先谈判高复杂度的语音压缩编解码器（例如G.729或者G.711）之后，方法或相应的装置强制发起和终止网关停留在低复杂度的非语音压缩编解码器（例如，ITU G.711） G.726）在语音通话的短的开始阶段。 低复杂度编解码器避免了与使用陷波滤波器阻止泄漏的以前解决方案相关的失真回答音泄漏，从而通过完全消除由使用语音的高复杂度编解码器引起的调制解调器应答回音失真，从而显着提高了VBD呼叫的成功率 并通过完全消除陷波滤波器的使用。

公开(公告)号：US07359489B2

公开(公告)日：2008-04-15

申请号：US10981832

申请日：2004-11-05

申请人： William B. Page ,  Yan Wang ,  Timothy G. Wade ,  Mark Milot ,  Ibrahim Yavuz ,  David Cheng-Song Qi

发明人： William B. Page ,  Yan Wang ,  Timothy G. Wade ,  Mark Milot ,  Ibrahim Yavuz ,  David Cheng-Song Qi

IPC分类号： H04M1/24 ,  H04M3/08 ,  H04M3/22

CPC分类号： H04M9/082

摘要： A testing and performance analysis methodology applies a series of test vector pairs to the input ports of an echo canceller under test. The test vector signal pair may represent a particular speech activity state transition, e.g., a Brady Model transition. A scoring compression function such as a sigmoid squashing function is used to evaluate quantized performance parameters. The sub-scores may be weighted and averaged to provide an overall performance score.

摘要翻译： 测试和性能分析方法将一系列测试矢量对应用于被测回波消除器的输入端口。 测试向量信号对可以表示特定的语音活动状态转换，例如Br​​ady模型转换。 使用诸如S形压缩函数的评分压缩函数来评估量化的性能参数。 子分数可以被加权和平均以提供总体绩效得分。

公开(公告)号：US07609646B1

公开(公告)日：2009-10-27

申请号：US10825030

申请日：2004-04-14

申请人： David Cheng-Song Qi ,  Yan Wang ,  Timothy G. Wade

发明人： David Cheng-Song Qi ,  Yan Wang ,  Timothy G. Wade

IPC分类号： H04L12/26

CPC分类号： H04L12/66

摘要： A system in a Voice Over Internet Protocol (VOIP) network eliminates false voice detection in voice band data service (e.g., modem or facsimile transmission) by sequentially enabling silence detection then voice detection. In Voice Band Data (VBD) mode, the system initially enables silence detection and disables voice detection. If silence is detected in a VOIP signal associated with a VOIP call, the system enables voice detection. If voice is detected, the system switches from VBD mode to voice mode and enables processing (e.g., echo cancellation and/or data compression) that improves voice communications.

摘要翻译： 通过互联网语音协议（VOIP）网络中的系统通过依次启用静音检测，然后语音检测来消除语音频带数据业务中的虚假语音检测（例如调制解调器或传真传输）。 在语音数据（VBD）模式下，系统初始化了静音检测功能，禁止语音检测。 如果在与VOIP呼叫相关联的VOIP信号中检测到静音，则系统启用语音检测。 如果检测到语音，则系统从VBD模式切换到语音模式，并且能够改善语音通信的处理（例如回声消除和/或数据压缩）。

公开(公告)号：US07583621B2

公开(公告)日：2009-09-01

申请号：US10958751

申请日：2004-10-05

申请人： David Cheng-Song Qi ,  Yan Wang ,  Timothy G. Wade ,  William B. Page

发明人： David Cheng-Song Qi ,  Yan Wang ,  Timothy G. Wade ,  William B. Page

IPC分类号： H04B3/20

CPC分类号： H04B3/23

摘要： A method, or corresponding apparatus, assumes a call is a Voice Band Data (VBD) call. The method disables a local echo canceller and transmits a tone that disables distal echo canceller(s) along a communications path across which the call is communicated. After disabling the echo cancellers, the echo cancellers are allowed to operate in a typical manner, such as according to ITU standards, after the call is established, including remaining disabled if the call is a Voice Band Data call and being automatically enabled if the call is or becomes a voice call. The method or apparatus is particularly useful in networks having Point of Service (POS) devices that have modems that do not send out a 2100 Hz tone to disable echo cancelling in the communications path. In one embodiment, the method or corresponding apparatus is deployed in a gateway.

摘要翻译： 方法或相应的装置假设呼叫是语音频带数据（VBD）呼叫。 该方法禁用本地回声消除器，并发送一个音调，禁止远程回声消除器沿着呼叫通信的通信路径。 在禁用回声消除器之后，回呼消除器被允许以典型的方式操作，例如根据ITU标准，在呼叫建立之后，包括如果呼叫是语音频带数据呼叫，则保持禁用，并且如果呼叫被自动启用 是或成为语音通话。 该方法或装置在具有不发送2100Hz音调以调制通信路径中的回波消除的调制解调器的服务点（POS）设备的网络中特别有用。 在一个实施例中，该方法或相应的装置部署在网关中。