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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。

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