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1. 发明授权

US4989243A Automatic compensation system of transmission level in MODEM 失效
标题翻译： MODEM传输电平自动补偿系统
公开(公告)号：US4989243A
公开(公告)日：1991-01-29
申请号：US292355
申请日：1988-12-30
申请人： Choon-Kun Choi
发明人： Choon-Kun Choi
IPC分类号： H04B1/16 , H03G3/00 , H03G3/20 , H04B3/04 , H04L13/00 , H04L25/08 , H04L27/00
CPC分类号： H04L25/08 , H03G3/001 , H04B3/04
摘要： A system for automatically compensating the transmitting (outgoing) signal level by detecting the receiving (incoming) signal level received from a communication channel to MODEM. Said system includes a gain controller for controlling the output gain of the analog signal received from analog signal input terminal in accordance with gain control data, hybrid means for amplifying the output of said gain controller, providing the amplified signal to transmit to a telephone line, and amplifying the analog signal received from the telephone line, receiving level sensing means for providing a plurality of receiving information data, said receiving information data teaching the level of the received signal, and a microprocessor unit for outputting the gain control data to said gain controller in response to the receiving information data and initial gain control data stored therein. The gain control data increases or decreases according to the receiving information data provided to the microprocessor, if the level of the receiving signal to the MODEM is too high or too low, thereby controlling its transmitting gain with an optimum level according to the receiving level.
摘要翻译：通过检测从通信信道接收到的（MODEM）信号的接收（进入）信号来自动补偿发送（输出）信号电平的系统。所述系统包括增益控制器，用于根据增益控制数据控制从模拟信号输入端接收的模拟信号的输出增益;混合装置，用于放大所述增益控制器的输出，提供放大的信号以传送到电话线，并且放大从电话线接收的模拟信号，接收电平检测装置，用于提供多个接收信息数据，所述接收信息数据指示接收信号的电平;以及微处理器单元，用于将增益控制数据输出到所述增益控制器响应于其中存储的接收信息数据和初始增益控制数据。如果到MODEM的接收信号的电平太高或太低，则根据提供给微处理器的接收信息数据，增益控制数据增加或减少，从而根据接收电平以最佳电平控制其发射增益。

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