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公开(公告)号：US4787080A
公开(公告)日：1988-11-22
申请号：US894861
申请日：1986-08-08
摘要： A PCM coder and decoder circuit for use in a subscriber line interface circuit of a telephone communication system has a digital balancing network for removing any echo signal. The digital balancing network is formed by series-connecting a first balancing circuit having characteristics corresponding to the fixed characteristics of a coder, decoder, etc. and a second balancing circuit having characteristics corresponding to variable characteristics of an external circuit including two-wire transmission line which is connected to the coder and decoder circuit. Thus, a replica of an echo signal is precisely produced, and the circuit configuration is simplified.
摘要翻译： 用于电话通信系统的用户线接口电路中的PCM编码器和解码器电路具有用于去除任何回波信号的数字平衡网络。 数字平衡网络通过串联连接具有与编码器，解码器等的固定特性相对应的特性的第一平衡电路和具有对应于包括双线传输线的外部电路的可变特性的特性的第二平衡电路 其连接到编码器和解码器电路。 因此，精确地产生回波信号的复制品，并且简化了电路配置。
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公开(公告)号：US4591827A
公开(公告)日：1986-05-27
申请号：US702224
申请日：1985-02-15
申请人： Shigeo Nishita , Kazuo Yamakido , Kenichi Ohwada
发明人： Shigeo Nishita , Kazuo Yamakido , Kenichi Ohwada
摘要： Disclosed is a PCM coder-decoder having a construction such that a digital filter contained originally in the PCM coder-decoder is utilized on the time division basis in order to fold back a digital reception signal to a digital signal transmission side and thus to accomplish interruption, communication exchange between three parties, gain control, fold-over test of the PCM signal, and so forth, in addition to the coding and decoding functions inherent to the PCM coder-decoder.
摘要翻译： 公开了一种PCM编码器解码器，其结构使得最初在PCM编码器 - 解码器中包含的数字滤波器在时间分割的基础上被使用，以便将数字接收信号折回到数字信号发送侧，从而完成中断 ，三方之间的通信交换，增益控制，PCM信号的折叠测试等等，以及PCM编码器 - 解码器固有的编码和解码功能。
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