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1. 再颁专利

USRE37569E1 High-speed modem synchronized to a remote codec 失效
标题翻译：高速调制解调器与远程编解码器同步
公开(公告)号：USRE37569E1
公开(公告)日：2002-03-05
申请号：US08805831
申请日：1997-02-26
申请人： Ender Ayanoglu , Nuri Ruhi Dagdeviren , James Emery Mazo , Burton Reuben Saltzberg , Irving Kalet
发明人： Ender Ayanoglu , Nuri Ruhi Dagdeviren , James Emery Mazo , Burton Reuben Saltzberg , Irving Kalet
IPC分类号： H04B138
CPC分类号： H04L7/0054 , H04B14/046 , H04L7/0334 , H04L25/4927
摘要： A modem that operates reliably at a symbol rate that corresponds to twice its bandwidth even when it is coupled to a receiving A/D converter that operates under control of a clock is realized by synchronizing the modem's operation to the A/D's clock. The superior operation of this modem advantageously extends to A/D clock frequencies beyond the frequency of twice the modem's bandwidth. To minimize quantization noise, the modem's output is conditioned to minimize intersymbol interference by adjusting the modem's output to the A/D converter's sampling times and slicing levels. When the A/D's clock is higher than twice the bandwidth of the modem's output signal, some intersymbol interference cannot be avoided. In accordance with this invention, the position and value of this interference is computed at the receiver and subtracted from the received signal.
摘要翻译：通过将调制解调器的操作与A / D的时钟同步，可以实现以对应于其带宽的两倍的符号速率可靠地操作的调制解调器，即使当其耦合到在时钟的控制下操作的接收A / D转换器时。该调制解调器的优越操作有利地扩展到超过调制解调器带宽两倍的A / D时钟频率。为了最小化量化噪声，调制解调器的输出通过将调制解调器的输出调整为A / D转换器的采样时间和切片电平来调节最小化符号间干扰。当A / D的时钟高于调制解调器输出信号带宽的两倍时，无法避免某些符号间干扰。根据本发明，在接收机处计算该干扰的位置和值，并将其从接收信号中减去。

2. 发明授权

US5828696A Timing recovery in a network-synchronized modem 失效
公开(公告)号：US5828696A
公开(公告)日：1998-10-27
申请号：US413678
申请日：1995-03-30
申请人： Ehud Alexander Gelblum , James Emery Mazo
发明人： Ehud Alexander Gelblum , James Emery Mazo
IPC分类号： H04L27/00 , H04J3/06 , H04L7/00 , H04L7/04 , H04L7/08 , H04L25/49 , H04B1/38 , H04L5/16
CPC分类号： H04L25/4927 , H04J3/0602 , H04L7/046 , H04L7/08
摘要： A timing technique for a Quantization-Level-Sampling (QLS) modem puts timing information in a downstream pulsed signal transmitted from the public switched telephone network (PSTN) to the QLS modem. In response to this timing information, the QLS modem synchronizes to the network sampling clock in the PSTN. In particular, the pulsed signal includes data-bearing samples, which were provided by a far-end QLS modem, and at least one non-user-data-bearing (NUDB) sample in which the level of this NUDB sample periodically alternates. The QLS modem extracts timing information from this periodic alternating signal level to synchronize the QLS modem to the network sampling clock.

3. 发明授权

US06542276B1 Method and apparatus for increasing the spectral efficiency of dense wavelength division multiplexed systems 有权
标题翻译：提高密集波分复用系统频谱效率的方法和装置
公开(公告)号：US06542276B1
公开(公告)日：2003-04-01
申请号：US09143189
申请日：1998-08-28
申请人： Rajiv Laroia , James Emery Mazo , Jason Blain Stark
发明人： Rajiv Laroia , James Emery Mazo , Jason Blain Stark
IPC分类号： H04B1004
CPC分类号： H04B10/505 , H04B10/5055 , H04B10/548
摘要： A method for increasing the spectral efficiency of a transmitted signal. The signal includes a sequence of symbols selected from a set of symbols with each of the symbols having an associated numerical value. A symbol is output from the sequences symbols. A spectral sum is determined by summing the numerical values of all the symbols that have been previously output. A first sum is calculated by adding the numerical value of the next symbol to be output to the spectral sum. A second sum is calculated by subtracting the numerical value of the next symbol to the output from the spectral sum. The next symbol will be output with the positive phase if the first sum is less than the second sum. The next symbol will be output with the negative phase if the first sum is greater than the second sum. If the first sum equals the second sum the next symbol is output with either a positive phase or negative phase.
摘要翻译：一种用于增加发送信号的频谱效率的方法。信号包括从符号组中选择的符号序列，其中每个符号具有相关联的数值。从序列符号输出符号。通过对先前输出的所有符号的数值求和来确定频谱和。通过将要输出的下一符号的数值加到频谱和中来计算第一和。通过从频谱和中减去下一符号的数值到输出来计算第二和。如果第一个和小于第二个和，则下一个符号将以正相输出。如果第一个和大于第二个和，则下一个符号将以负相输出。如果第一个和等于第二个和，则下一个符号以正相或负相输出。

4. 发明授权

US6094452A Timing recovery in a network-synchronized modem 失效
标题翻译：网络同步调制解调器中的定时恢复
公开(公告)号：US6094452A
公开(公告)日：2000-07-25
申请号：US105312
申请日：1998-06-25
申请人： Ehud Alexander Gelblum , James Emery Mazo
发明人： Ehud Alexander Gelblum , James Emery Mazo
IPC分类号： H04L27/00 , H04J3/06 , H04L7/00 , H04L7/04 , H04L7/08 , H04L25/49 , H04B1/56
CPC分类号： H04L25/4927 , H04J3/0602 , H04L7/046 , H04L7/08
摘要： A timing technique for a Quantization-Level-Sampling (QLS) modem puts timing information in a downstream pulsed signal transmitted from the public switched telephone network (PSTN) to the QLS modem. In response to this timing information, the QLS modem synchronizes to the network sampling clock in the PSTN. In particular, the pulsed signal includes data-bearing samples, which were provided by a far-end QLS modem, and at least one non-user-data-bearing (NUDB) sample in which the level of this NUDB sample periodically alternates. The QLS modem extracts timing information from this periodic alternating signal level to synchronize the QLS modem to the network sampling clock.
摘要翻译：量化级采样（QLS）调制解调器的定时技术将定时信息放在从公共交换电话网（PSTN）发送到QLS调制解调器的下行脉冲信号中。响应于该定时信息，QLS调制解调器与PSTN中的网络采样时钟同步。特别地，脉冲信号包括由远端QLS调制解调器提供的数据承载样本和至少一个非用户数据承载（NUDB）样本，其中该NUDB样本的级别周期性地交替。 QLS调制解调器从该周期性交替信号电平提取定时信息，以使QLS调制解调器与网络采样时钟同步。

5. 发明授权

US5757849A Timing recovery in a network-synchronized modem 失效
标题翻译：网络同步调制解调器中的定时恢复
公开(公告)号：US5757849A
公开(公告)日：1998-05-26
申请号：US413675
申请日：1995-03-30
申请人： Ehud Alexander Gelblum , James Emery Mazo
发明人： Ehud Alexander Gelblum , James Emery Mazo
IPC分类号： H04B3/23 , H03H21/00 , H04B3/10 , H04J3/06 , H04L7/04 , H04L7/08 , H04L7/10 , H04L25/03 , H04L25/49 , H04L27/00 , H04B1/22
CPC分类号： H04L7/08 , H04J3/0602 , H04L25/4927 , H04L7/046
摘要： A timing technique for a Quantization-Level-Sampling (QLS) modem puts timing information in a downstream pulsed signal transmitted from the public switched telephone network (PSTN) to the QLS modem. In response to this timing information, the QLS modem synchronizes to the network sampling clock of the PSTN. In particular, the pulsed signal includes data-bearing samples, which were provided by a far-end QLS modem, and at least one non-user-data-bearing (NUDB) sample in which the level of this NUDB sample periodically alternates. The QLS modem extracts timing information from this periodic alternating signal level to synchronize the QLS modem to the network sampling clock.
摘要翻译：量化级采样（QLS）调制解调器的定时技术将定时信息放在从公共交换电话网（PSTN）发送到QLS调制解调器的下行脉冲信号中。响应于该定时信息，QLS调制解调器与PSTN的网络采样时钟同步。特别地，脉冲信号包括由远端QLS调制解调器提供的数据承载样本和至少一个非用户数据承载（NUDB）样本，其中该NUDB样本的级别周期性地交替。 QLS调制解调器从该周期性交替信号电平提取定时信息，以将QLS调制解调器与网络采样时钟同步。

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