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6 条记录 (耗时 0.028 秒)

    Apparatus and method for monitoring full duplex data communications
    1.
    发明授权
    Apparatus and method for monitoring full duplex data communications 失效
    用于监控全双工数据通信的装置和方法

    公开(公告)号：US6078645A

    公开(公告)日：2000-06-20

    申请号：US803475

    申请日：1997-02-20

    申请人： Lujing Cai ,  Herbert B. Cohen ,  Richard Rogoszewicz ,  Mingjie Wang

    发明人： Lujing Cai ,  Herbert B. Cohen ,  Richard Rogoszewicz ,  Mingjie Wang

    IPC分类号： H04M1/24 ,  H04M3/00

    CPC分类号： H04B3/23

    摘要： A modem monitor for monitoring full duplex communications comprises one receiver for each data stream and an echo canceler for canceling "far" echo. Prior to each receiver decoding the data stream it is designed to monitor, it replicates an echo expected to be found in its received data stream from a sample of each of the other predecoded data streams. The echo canceler then subtracts the expected echo from the received data stream to remove all far echoes caused by the other data streams. The echo canceled data stream is then decoded. The monitor can also include a data communications network interface and a sample rate converter operating with the PSTN for converting from the network transmission rate to the data transmission rate.

    摘要翻译： 用于监控全双工通信的调制解调器监视器包括用于每个数据流的一个接收器和用于消除“远”回波的回波消除器。 在每个接收机解码数据流之前，它被设计为监视，它从其他预编码数据流中的每一个的样本复制期望在其接收的数据流中找到的回波。 回波消除器然后从接收的数据流中减去预期的回波，以消除由其他数据流引起的所有远端回波。 然后对回波抵消的数据流进行解码。 监视器还可以包括数据通信网络接口和与PSTN一起工作的采样率转换器，用于从网络传输速率转换为数据传输速率。

    Method of upstream channel modeling for PCM modem
    2.
    发明授权
    Method of upstream channel modeling for PCM modem 失效
    PCM调制解调器上行信道建模方法

    公开(公告)号：US5887027A

    公开(公告)日：1999-03-23

    申请号：US998249

    申请日：1997-12-24

    申请人： Herbert B. Cohen ,  Mingjie Wang

    发明人： Herbert B. Cohen ,  Mingjie Wang

    IPC分类号： H03M1/18 ,  H04B3/06 ,  H04L25/02 ,  H04L25/03 ,  H04L25/49 ,  H04L27/01 ,  H04B1/38

    CPC分类号： H04L25/03343 ,  H04L25/0212 ,  H04L25/0228 ,  H04L25/4927 ,  H04L2025/03363 ,  H04L2025/03802

    摘要： A method is presented to enable high speed transmission in the upstream channel from a customer's modem to a PCM modem connected to the public switched digital network. The upstream channel is equalized by having the client modem send a known training sequence in the upstream direction to the server modem. The server modem calculates the cross-correlation between the known training sequence and the sequence as actually received from the client modem. The cross-correlation is then multiplied by the known auto-correlation of the training sequence to produce a model of the channel response. The channel response is then reported to the client modem so that it may adjust its pre-equalizer to construct the signal that the client modem will thereafter send in the upstream direction.

    摘要翻译： 提出了一种方法，用于实现从客户调制解调器到连接到公共交换数字网络的PCM调制解调器的上行信道中的高速传输。 通过使客户端调制解调器向服务器调制解调器向上游方向发送已知的训练序列，使上游信道相等。 服务器调制解调器计算从客户调制解调器实际接收的已知训练序列与序列之间的互相关。 然后将互相关乘以训练序列的已知自相关，以产生信道响应的模型。 然后将信道响应报告给客户端调制解调器，使得其可以调整其前置均衡器以构建客户端调制解调器之后在上行方向发送的信号。

    Digital processor for reduced distortion and frequency deviation
    4.
    发明授权
    Digital processor for reduced distortion and frequency deviation 失效
    数字处理器可减少失真和频率偏差

    公开(公告)号：US5929795A

    公开(公告)日：1999-07-27

    申请号：US878925

    申请日：1997-06-19

    申请人： Mingjie Wang

    发明人： Mingjie Wang

    IPC分类号： G06F7/544 ,  H03H17/02 ,  H03H17/06 ,  H03M1/62 ,  G01H1/02

    CPC分类号： H03H17/0261 ,  G06F7/544

    摘要： Apparatus, system, and method is disclosed for digitally processing a signal for reduced distortion and frequency deviation. The digital processor involves increasing the sampling frequency of a digital signal prior to a non-linear operating stage. The processed signal is then passed through a low pass filter prior to being down-converted to the initial sampling frequency. Thus, a signal can be digitally processed for reduced distortion as well as reduced frequency deviation.

    摘要翻译： 公开了用于数字处理信号以减少失真和频率偏差的装置，系统和方法。 数字处理器涉及在非线性操作阶段之前增加数字信号的采样频率。 然后，经处理的信号在被下变频至初始采样频率之前通过低通滤波器。 因此，可以对信号进行数字处理以减少失真以及降低的频率偏差。

    System and method for recovering primary channel operation in a facsimile receiver and facsimile machine incorporating the same
    6.
    发明授权
    System and method for recovering primary channel operation in a facsimile receiver and facsimile machine incorporating the same 失效
    用于恢复传真接收机中的主要频道操作的系统和方法以及包含其的传真机

    公开(公告)号：US07239431B2

    公开(公告)日：2007-07-03

    申请号：US09826074

    申请日：2001-04-04

    申请人： Mingjie Wang

    发明人： Mingjie Wang

    IPC分类号： H04N1/00 ,  H04N1/40 ,  H04B1/00 ,  H04L27/00

    CPC分类号： H04N1/33392 ,  H04N1/36

    摘要： A system for, and method of recovering primary channel operation in a facsimile (fax) receiver and a fax machine that incorporates the system, the method or both. In one embodiment, the system includes: (1) a signal receiver that receives a signal containing first and second points located at first and second angles and (2) angle determination circuitry that determines an offset angle by which the signal has been rotated based on the first and second angles.

    摘要翻译： 在传真（传真）接收机和包含系统，方法或两者的传真机中恢复主要频道操作的系统和方法。 在一个实施例中，系统包括：（1）信号接收器，其接收包含位于第一和第二角度的第一和第二点的信号;以及（2）角度确定电路，其基于以下步骤确定信号已被旋转的偏移角度 第一和第二个角度。