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公开(公告)号：US5050164A
公开(公告)日：1991-09-17
申请号：US429845
申请日：1989-10-31
CPC分类号： H04L12/2852 , H04J3/0632 , H04Q11/0478 , H04L2012/5614
摘要： A customer premises network for interfacing customer premises equipment with a broadband digital trunk and exchange network comprises a relatively large bandwidth optical broadcast bus for broadcasting downstream data to the customer premises equipment and a smaller bandwidth looped bus for transmitting upstream data from the customer premises equipment. The units of customer premises equipment are connected by the looped bus in a daisy chain.
摘要翻译： 用于将客户驻地设备与宽带数字中继线和交换网络连接的用户驻地网络包括用于向用户驻地设备广播下游数据的较大带宽光学广播总线和用于从客户驻地设备发送上行数据的较小带宽循环总线。 客户端设备的单元通过环形总线以菊花链连接。
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公开(公告)号：US5079763A
公开(公告)日：1992-01-07
申请号：US662123
申请日：1991-02-28
CPC分类号： H04L12/2852 , H04J3/0632 , H04Q11/0478 , H04L2012/5614
摘要： A method of controlling the access of a plurality of nodes to a bus which interconnects the nodes in a daisy chain. The method enables each node in the network to keep track of the transmission requests of all other nodes. Each node will compare it's needs against all requests and will only transmit onto the network after it has let pass sufficient resources to satisfy the downstream nodes.
摘要翻译： 控制多个节点对连接菊花链中的节点的总线的访问的方法。 该方法使得网络中的每个节点能够跟踪所有其他节点的传输请求。 每个节点将根据所有请求进行比较，只有在传递足够的资源以满足下游节点之后，才能将其传输到网络上。
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公开(公告)号：US5271057A
公开(公告)日：1993-12-14
申请号：US774085
申请日：1991-10-09
CPC分类号： H04M9/087
摘要： An audio processing system (100) for use in a teleconferencing system (10) utilizes complementary comb filters (42, 52, 220, 320) in combination with an echo suppressor (210, 310) and/or a frequency scaler (60, 120) to substantially improve acoustic stability margin and reduce far-end talker echo.
摘要翻译： 用于电话会议系统（10）的音频处理系统（100）利用与回波抑制器（210,310）和/或频率缩放器（60,120）组合的互补梳状滤波器（42,42,220,320） ），以显着提高声学稳定性裕度，并减少远端讲话者的回声。
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4.发明授权Audio processing system for teleconferencing with high and low transmission delays 失效用于具有高和低传输延迟的电话会议的音频处理系统
公开(公告)号：US5386465A
公开(公告)日：1995-01-31
申请号：US8965
申请日：1993-01-26
CPC分类号： H04M9/087
摘要： An audio processing system for use in teleconferencing systems having high and low transmission delays. The audio processing system utilizes complementary comb filters in combination with auxiliary echo suppressors, a frequency scaler, expander/gates and automatic level controlling devices to substantially improve acoustic stability margin and reduce far-end talker echo.
摘要翻译： 一种用于具有高和低传输延迟的电话会议系统中的音频处理系统。 音频处理系统利用互补梳状滤波器与辅助回波抑制器，频率缩放器，扩展器/门和自动电平控制装置相结合，以显着提高声稳定裕度并减少远端讲话者回波。
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5.发明授权
公开(公告)号：US5434912A
公开(公告)日：1995-07-18
申请号：US105216
申请日：1993-08-11
申请人： David G. Boyer , Ali L. Jalali , Gennady Shtirmer
发明人： David G. Boyer , Ali L. Jalali , Gennady Shtirmer
摘要： Our audio processing system for use in teleconferencing systems includes a microphone, receiver, and substantially the same comb filter and frequency scaler at each station for reducing acoustic echo and increasing the margin of acoustic stability. The comb filters and frequency scalers cooperate with one another in that the frequency scalers each induces a shift in frequency which corresponds to the peak-to-trough spacing of the transfer function of the comb filters. Our audio processing system may also include auxiliary echo suppressors for reducing acoustic echo and increasing the margin of acoustic stability in systems having high and low transmission delays. Other devices may be employed for reducing noise and smoothing out the operation of individual components in the system. Since the comb filters employed at each station are not complementary, but are substantially the same, our audio processing system can mitigate the effects of acoustic instability and echo in point-to-point and multipoint audio processing systems. Furthermore, since each station utilizes substantially the same equipment, the need for equipment negotiation between stations and equipment changes prior to a conferencing session is obviated.
摘要翻译： 我们用于电话会议系统的音频处理系统包括麦克风，接收器以及每个站上基本相同的梳状滤波器和频率缩放器，用于减少声学回声并增加声学稳定性的余量。 梳状滤波器和频率缩放器彼此协作，因为频率缩放器各自引起对应于梳状滤波器的传递函数的峰 - 谷间隔的频率偏移。 我们的音频处理系统还可以包括用于在具有高和低传输延迟的系统中减少声学回声和增加声学稳定性的边缘的辅助回声抑制器。 可以使用其他装置来减少噪声并平滑系统中各个组件的操作。 由于在每个站使用的梳状滤波器不是互补的，而是基本上相同的，所以我们的音频处理系统可以减轻点对点和多点音频处理系统中的声学不稳定性和回声的影响。 此外，由于每个站使用基本相同的设备，所以在会议会话之前对站和设备之间的设备协商的需求的改变被消除。
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6.发明授权Sound localization system for teleconferencing using self-steering microphone arrays 失效使用自动转向麦克风阵列的电话会议的声音定位系统
公开(公告)号：US5335011A
公开(公告)日：1994-08-02
申请号：US3380
申请日：1993-01-12
申请人： Eric J. Addeo , John D. Robbins , Gennady Shtirmer
发明人： Eric J. Addeo , John D. Robbins , Gennady Shtirmer
CPC分类号： H04R1/406 , H04N7/15 , H04R2201/403
摘要： A teleconferencing system 100 is disclosed having a video camera for generating a video signal representative of a video image of a first station B. A microphone array 150, 160 is also provided in the first station for receiving a sound from one or more fixed non-overlapping volume zones 151, 152, 153, 154, 155, 156, 157, 158, 159, into which the first station is divided. The microphone array is also provided for generating a monochannel audio signal 170 representative of the received sound and a direction signal indicating, based on the sound received from each zone, from which of the volume zones the sound originated. The teleconferencing system also includes a display device 120A at a second station A for displaying a video image of the first station. A loudspeaker control device 140 is also provided at the second station for selecting a virtual location 121 on the displayed video image depending on the direction signal, and for generating stereo sound from the monochannel audio signal which stereo sound emanates from the virtual location on the displayed video image.
摘要翻译： 公开了一种电视会议系统100，其具有用于产生代表第一电台B的视频图像的视频信号的摄像机。还在第一电台中设置麦克风阵列150,160，用于从一个或多个固定无线电设备接收声音， 重叠体积区域151,152,153,154,155,156,157,158,159，其中第一站被划分到其中。 麦克风阵列还被提供用于产生表示接收到的声音的单声道音频信号170，以及一个方向信号，该方向信号基于从每个区域接收到的声音，从音源中的哪一个区域起始。 电话会议系统还包括在第二站A处的显示设备120A，用于显示第一站的视频图像。 扬声器控制装置140还设置在第二站处，用于根据方向信号选择显示的视频图像上的虚拟位置121，并且用于从显示的虚拟位置产生的立体声从单声道音频信号产生立体声 视频图像。
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