一、概论随着通信事业的发展,数字电话在各大城市的日趋普及,不可避免在相当时期内存在数模并存的电话通信形式。TDM/FDM复接转换器可以对两种制式的话音信号进行有效地转换,且较以前由音频过渡的方法简单得多。本文根据(?)所提的多级结构复接转换器方案,提出进一步的改进方案。首先依据本转换器的特点提出一种用全通网络构成的波数字滤波器的实现方法,从而使转换器的运算 I. Introduction With the development of communications, the increasing popularity of digital telephones in major cities inevitably exists in the form of telephone communications coexisting in digital mode during a considerable period of time. The TDM / FDM multiplexer effectively translates both standard voice signals, much simpler than previous methods of audio transition. In this paper, according to (?) Mentioned multi-level structure of the multiplex converter program, put forward further improvements. First of all, according to the characteristics of this converter, a method of implementing the digital filter with an all-pass network is proposed, so that the operation of the converter