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公开(公告)号：US5050189A
公开(公告)日：1991-09-17
申请号：US270739
申请日：1988-11-14
CPC分类号： H04L25/4919 , H04L25/03006 , H04L7/0338
摘要： A transceiver for a LAN is capable of communicating multiple bits per signal element to increase the data throughput of the LAN. The transceiver includes a transmitter which receives a multiple bit digital input value originating at a node of the LAN at which the transceiver is present. The transmitter converts the multiple bit digital input signal into a pulse-like analog signal which is amplitude and phase modulated. A receiver of a transceiver at a receiving node the transmitted analog signal converts its amplitude and phase into a corresponding multiple bit digital output value. A time-domain filter of the receiver creates a primary signal from the received analog signal. To sample the primary signal at its maximum amplitude point, a derivative of the primary signal waveform is used to establish the zero derivative point at which the primary signal attains its maximum amplitude, and to establish a fixed sampling point for subsequent signals. The sampling point is synchronized in phase with the stream of received analog signals. The residual intersymbol interference (ISI) effect of preceding signals on the LAN medium is eliminated prior to converting the primary signal to the digital value. To adjust and compensate for attenuation and amplification created by the LAN medium, the signal values are normalized.
摘要翻译： 用于LAN的收发器能够对每个信号元件通信多个比特以增加LAN的数据吞吐量。 收发器包括发送器，其接收始发于存在收发器的LAN的节点处的多位数字输入值。 发射机将多位数字输入信号转换为脉冲状模拟信号，该模拟信号是幅度和相位调制的。 在接收节点处的收发器的接收器，传输的模拟信号将其幅度和相位转换成相应的多位数字输出值。 接收机的时域滤波器从接收的模拟信号产生主信号。 为了在其最大振幅点对主信号进行采样，使用主信号波形的导数来建立主信号达到其最大幅度的零点，并建立后续信号的固定采样点。 采样点与接收到的模拟信号的流相同步。 在将主信号转换为数字值之前，先前信号在LAN介质上的残余码间干扰（ISI）效应被消除。 为了调整和补偿由LAN介质产生的衰减和放大，信号值被归一化。
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公开(公告)号：US4847829A
公开(公告)日：1989-07-11
申请号：US126845
申请日：1987-11-25
摘要： A video conferencing network includes remote video terminals (10) interconnected to a switching network (66) through coaxial cables (16). The switching network (66) is operable to provide an audio and video data path between two or more video terminals (10). The switching network (66) operates as both an audio/video crosspoint switch and also as a network controller. In the network control mode, the switching network (66) operates in both a master mode for maintaining data communication with all of the video terminals (10) and also in a slave mode for maintaining status of devices attached to the switching network (66). In the master mode, the switching network (66) receives requests from each of the video terminals (10) and services these requests to determine available data paths for interconnection with other video terminals. In the slave mode, the switch (66) is in data communication with all of the video terminals (10) to determine the status thereof which is stored in a slave status table. This information in the status table is transferred to a separate network table that is maintained in the master mode for network purposes.
摘要翻译： 视频会议网络包括通过同轴电缆（16）互连到交换网络（66）的远程视频终端（10）。 交换网络（66）可操作以在两个或多个视频终端（10）之间提供音频和视频数据路径。 交换网络（66）既作为音频/视频交叉点交换机又作为网络控制器。 在网络控制模式中，交换网络66在主模式下操作，用于维持与所有视频终端（10）的数据通信，并且还处于从模式，用于维持连接到交换网络（66）的设备的状态。 。 在主模式中，交换网络（66）从每个视频终端（10）接收请求并服务这些请求，以确定用于与其他视频终端互连的可用数据路径。 在从模式中，开关（66）与所有视频终端（10）进行数据通信，以确定存储在从属状态表中的状态。 状态表中的该信息被传送到为了网络目的而保持在主模式中的单独的网络表。
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公开(公告)号：US5077732A
公开(公告)日：1991-12-31
申请号：US559391
申请日：1990-07-24
申请人： Michael A. Fischer , William M. Cox
发明人： Michael A. Fischer , William M. Cox
摘要： Multiple different operational capabilities, such as data transfer rates or communication protocols, are selectable for use on a single LAN. Enchanced nodes of the LAN have the capability of utilizing either an enhanced capability or a common capability in communicating with other nodes. Those basic nodes which are not of the enhanced variety have the capability of communicating utilizing the common capability. The enhanced nodes dynamically select the operational capability for the most efficient communication with other nodes.
摘要翻译： 可以选择多种不同的操作功能，例如数据传输速率或通信协议，以便在单个LAN上使用。 LAN的加强节点具有利用增强能力或与其他节点通信的共同能力的能力。 那些不是增强品种的基本节点具有利用通用能力进行通信的能力。 增强节点动态地选择与其他节点进行最有效通信的操作能力。
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公开(公告)号：US5034967A
公开(公告)日：1991-07-23
申请号：US285206
申请日：1988-12-16
申请人： William M. Cox , Michael A. Fischer
发明人： William M. Cox , Michael A. Fischer
CPC分类号： H04L7/0338 , H04L25/03006 , H04L25/4919
摘要： An output clock signal is synchronized with predetermined phase accuracy relative to an internal stable frequency reference clock signal upon the application of a transition of an asynchronous event signal. A plurality of phase shifted versions of the reference clock signal are derived. Upon the occurrence of the asynchronous signal, the states of the phase shifted versions are sampled, and that information is utilized as a code to select one of the phase shifted versions from which the output clock signal is derived. Synchronization occurs rapidly within the metastable settling time of the flip-flops of a register which sample or decode the states of the phase shifted versions, or by logical gating arrangements which avoid the necessity for considering the metastable signal. Synchronization is typically obtainable in less than the period of one reference clock signal.
摘要翻译： 在应用异步事件信号的转换时，输出时钟信号与相对于内部稳定频率参考时钟信号的预定相位精度同步。 导出参考时钟信号的多个相移版本。 在发生异步信号时，对相移版本的状态进行采样，并且将该信息用作代码以选择从其导出输出时钟信号的相移版本之一。 在对采样或解码相移版本的状态的寄存器的触发器的亚稳定建立时间内，或通过逻辑选通布置避免考虑亚稳态信号的必要性，快速发生同步。 通常可以在一个参考时钟信号的周期内获得同步。
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公开(公告)号：US5008879A
公开(公告)日：1991-04-16
申请号：US270641
申请日：1988-11-14
IPC分类号： H04L12/417
CPC分类号： H04L12/40032 , H04L12/417 , H04L12/407
摘要： Two different communication protocols are interoperatively combined for use in a local area network (LAN). An enhanced protocol can be selected as an alternative to a common protocol during communication between enhanced nodes of the LAN. Signals communicated between nodes of the LAN in the first and second protocols create the appearance of valid activity in both protocols, and always communicate at least some valid information in one of the protocols and selectively communicate additional valid information in a second protocol. Preferably the signals applied in the second or enhanced protocol include signals which are inserted in such a way that they are transparent to the first protocol. Improved network management capabilities and data transfer rates are available as a result of the information communicated in the second protocol.
摘要翻译： 两种不同的通信协议被互操作地组合以用于局域网（LAN）。 在LAN的增强节点之间的通信期间，可以选择增强协议作为公共协议的替代。 在第一和第二协议中的LAN的节点之间传送的信号在两个协议中产生有效活动的出现，并且总是在一个协议中传达至少一些有效信息，并且选择性地在第二协议中传送附加的有效信息。 优选地，在第二或增强协议中应用的信号包括以对第一协议是透明的方式插入的信号。 由于在第二协议中传达的信息，提高了网络管理能力和数据传输速率。
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公开(公告)号：US4433298A
公开(公告)日：1984-02-21
申请号：US320184
申请日：1981-11-12
申请人： Charles S. Palm
发明人： Charles S. Palm
CPC分类号： G03G15/5037 , G01R29/24
摘要： The disclosed calibrated ASV measurement apparatus provides accurate measurements of the ASV (apparent surface voltage) on a photoconductive imaging medium using a relatively low cost, commercially available ASV probe. To obtain accurate ASV measurements, the probe sensitivity (relating probe voltgage output to sensed potential) is periodically recalibrated to compensate for changes in environmental and electrical conditions. The calibration function is implemented using a calibration target mounted directly to the housing of the probe's sensing head so as to occupy a portion of the probe's sensing field. During periodic calibration intervals, when the ASV probe is responsive only to potentials on the calibration target, known potentials are applied to the calibration target, and an indication of a change in probe sensitivity with respect to the calibration target is calculated and used to recalibrate the value for probe sensitivity used in ASV measurement. During periodic ASV measurement intervals (with the calibration target at ground potential), the ASV probe is exposed to a reference ground and to the ASV on the imaging medium to obtain a differential probe voltgage, and this differential voltage is translated using the calibrated probe sensitivity into the desired ASV measurement relative to the reference ground. For a preferred embodiment, the periodic ground reference potential is provided by a grounded seam on the surface of the electrophotographic drum, such that separate means for that purpose are not required to be provided as part of the ASV probe.
摘要翻译： 所公开的经校准的ASV测量装置使用相对低成本的市售ASV探针在光电导成像介质上提供对ASV（表观表面电压）的精确测量。 为了获得准确的ASV测量，探头灵敏度（将探头电压输出与感测电位相关联）定期重新校准，以补偿环境和电气条件的变化。 校准功能使用直接安装在探头感测头的壳体上的校准目标来实现，以便占据探头感测场的一部分。 在定期校准间隔期间，当ASV探针仅对校准目标上的电位进行响应时，将已知电位施加到校准目标，并计算相对于校准目标的探针灵敏度变化的指示，并用于重新校准 用于ASV测量的探头灵敏度值。 在周期性ASV测量间隔（校准目标在地电位）期间，ASV探针暴露于成像介质上的参考地和ASV以获得差分探针电压，并使用校准的探针灵敏度平移该差分电压 进入相对于参考地面的所需ASV测量。 对于优选实施例，周期性接地参考电位由电子照相鼓表面上的接地接缝提供，使得不需要将用于该目的的单独装置作为ASV探针的一部分提供。
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公开(公告)号：US4941089A
公开(公告)日：1990-07-10
申请号：US941084
申请日：1986-12-12
申请人： Michael A. Fischer
发明人： Michael A. Fischer
IPC分类号： G06F13/00 , G06F20060101 , G06F13/12 , H04J20060101 , H04J3/24 , H04L12/40 , H04L29/00 , H04L29/06 , H04Q20060101 , H04Q9/00
CPC分类号： H04L29/00 , G06F13/128
摘要： An I/O network channel achieves relatively high rates of data communication between a plurality of widely physically dispersed devices interconnected by a LAN-type media. A processor connected to each node of the media controls the data and functions of a receiver and transmitter at each node to establish network level, transport level and session level data communication and control functions.
摘要翻译： I / O网络信道在由LAN型媒体互连的多个广泛物理分散的设备之间实现相对高的数据通信速率。 连接到媒体的每个节点的处理器控制每个节点处的接收机和发射机的数据和功能，以建立网络级，传输级和会话级数据通信和控制功能。
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公开(公告)号：US4716585A
公开(公告)日：1987-12-29
申请号：US720507
申请日：1985-04-05
摘要： An audio conferencing system includes a plurality of remote stations (10) which are interconnected in a conference mode through a central switching network (66) through communication lines (16). Each of the remote stations has a microphone (34) and a speaker (64) associated therewith. The microphone (34) on each of the remote stations has a voltage controlled amplifier (VCA) (59) associated therewith and the speaker (64) has a VCA (60) associated therewith. A CPU (48) selectively controls the output of the microphone (34) to selectively decrease the gain thereof when voice is not detected. When voice is detected above a predetermined threshold, the microphone (34) is allowed to operate at full gain and the speaker (64) has the output level thereof decreased. This effectively reduces the audio loop gain between remote stations in a conference.
摘要翻译： 音频会议系统包括通过通过通信线路（16）的中央交换网络（66）以会议模式互连的多个远程站（10）。 每个远程站具有与之相关联的麦克风（34）和扬声器（64）。 每个远程站上的麦克风（34）具有与其相关联的压控放大器（VCA）（59），扬声器（64）具有与之相关的VCA（60）。 当未检测到语音时，CPU（48）选择性地控制麦克风（34）的输出以选择性地降低其增益。 当检测到高于预定阈值的语音时，麦克风（34）被允许以全增益操作，并且扬声器（64）的输出电平减小。 这有效地减少了会议中远程站之间的音频环路增益。
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公开(公告)号：US4710917A
公开(公告)日：1987-12-01
申请号：US721281
申请日：1985-04-08
摘要： A video conferencing network includes remote video terminals (10) interconnected to a switching network (66) through coaxial cables (16). The switching network (66) is operable to provide an audio and video data path between two or more video terminals (10). The switching network (66) operates as both an audio/video crosspoint switch and also as a network controller. In the network control mode, the switching network (66) operates in both a master mode for maintaining data communication with all of the video terminals (10) and also in a slave mode for maintaining status of devices attached to the switching network (66). In the master mode, the switching network (66) receives requests from each of the video terminals (10) and services these requests to determine available data paths for interconnection with other video terminals. In the slave mode, the switch (66) is in data communication with all of the video terminals (10) to determine the status thereof which is stored in a slave status table. This information in the status table is transferred to a separate network table that is maintained in the master mode for network purposes.
摘要翻译： 视频会议网络包括通过同轴电缆（16）互连到交换网络（66）的远程视频终端（10）。 交换网络（66）可操作以在两个或多个视频终端（10）之间提供音频和视频数据路径。 交换网络（66）既作为音频/视频交叉点交换机又作为网络控制器。 在网络控制模式中，交换网络66在主模式下操作，用于维持与所有视频终端（10）的数据通信，并且还处于从模式，用于维持连接到交换网络（66）的设备的状态。 。 在主模式中，交换网络（66）从每个视频终端（10）接收请求并服务这些请求，以确定用于与其他视频终端互连的可用数据路径。 在从模式中，开关（66）与所有视频终端（10）进行数据通信，以确定存储在从属状态表中的状态。 状态表中的该信息被传送到为了网络目的而保持在主模式中的单独的网络表。
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10.发明授权Connecting mechanism for word processor - controlled printer output module cabinets 失效文字处理器 - 控制打印机输出模块机柜的连接机构
公开(公告)号：US4433881A
公开(公告)日：1984-02-28
申请号：US321807
申请日：1981-11-16
CPC分类号： A47B96/00 , H05K5/0021
摘要： A connecting and alignment mechanism for printer output module cabinets having facing adjacent wall members, comprising vertical positioning male-female docking channels and lateral positioning docking pins and recepticles.
摘要翻译： 具有面向相邻壁构件的打印机输出模块柜的连接和对准机构，包括垂直定位的公 - 母对接通道和侧向定位对接销和接收器。
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