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31. 发明授权

US5572524A Digital-transmission/analog-transmission changeover apparatus 失效
标题翻译：数字传输/模拟传输切换装置
公开(公告)号：US5572524A
公开(公告)日：1996-11-05
申请号：US139426
申请日：1993-10-20
申请人： Yuichi Harada , Takayuki Iwasa , Hitomi Akiyoshi
发明人： Yuichi Harada , Takayuki Iwasa , Hitomi Akiyoshi
IPC分类号： H04L29/06 , H04L29/08 , H04M11/00 , H04M11/06 , H04Q11/04 , H04L12/00
CPC分类号： H04Q11/0428 , H04M11/068 , H04Q2213/13031 , H04Q2213/13034 , H04Q2213/13103 , H04Q2213/13106 , H04Q2213/13204 , H04Q2213/13209 , H04Q2213/13216 , H04Q2213/13292 , H04Q2213/13297
摘要： A digital-transmission/analog-transmission changeover apparatus in a communication system for performing a digital transmission between a digital terminal and a terminal accommodated by an ISDN, and performing an analog transmission via the ISDN and an analog network, between the digital terminal and a terminal accommodated by the analog network includes a rate converter for converting the rate of data, which has entered from the digital terminal, to a rate suited to the ISDN, and for converting the rate of data, which has entered from the ISDN, to the rate of the digital terminal. A modulator/demodulator for modulating digital data, which has entered from the digital terminal, into an analog signal and demodulating the analog signal into digital data is provided. A PCM converter is connected to the modulator/demodulator for converting the analog signal into digital data at a rate suited to the ISDN, and converting digital data from the ISDN into the analog signal. An ISDN communication controller is connected to the rate converter and the PCM converter for performing communication control in accordance with an ISDN protocol. A connection controller connects the digital terminal either to the rate converter or to the modulator/demodulator.
摘要翻译：一种通信系统中的数字传输/模拟传输切换装置，用于在数字终端和由ISDN容纳的终端之间进行数字传输，并经由ISDN和模拟网络在数字终端与由模拟网络容纳的终端包括速率转换器，用于将从数字终端输入的数据速率转换为适合于ISDN的速率，并将从ISDN输入的数据速率转换为数字终端的速率。提供了一种用于将从数字终端进入的数字数据调制成模拟信号并将模拟信号解调为数字数据的调制器/解调器。 PCM转换器连接到调制器/解调器，用于以适合于ISDN的速率将模拟信号转换成数字数据，并将数字数据从ISDN转换为模拟信号。 ISDN通信控制器连接到速率转换器和PCM转换器，用于根据ISDN协议执行通信控制。连接控制器将数字终端连接到速率转换器或调制器/解调器。

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