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通信要适应城市改革的需要,电话网必须能快速的传递信息(数据)。为了改造电话线路,首先要对其群时延进行精密测量,以求得掌握其群时延的失真,并采取措施以减缓之。本文叙述的是用微处理机在射频频率下,对将要传输数据的电话线路进行群时延失真精密测量的方法及理论依据。分别讨论了环路测量和线路测量方法,并对使用微处理机及其存储程序的方法进行了阐述。文中提供了一个以微处理机为基础的群时延量计方框图,并对此作了评价。这是一个不仅可靠、价廉,而且是一种精密的电话线群时延量计。
To adapt to the needs of urban reform, the telephone network must be capable of delivering information (data) quickly. In order to rebuild the telephone line, it is necessary to make a precise measurement of its group delay in order to grasp the distortion of its group delay and to take measures to reduce it. This article describes the method and theoretical basis for the precision measurement of group delay distortion on the telephone lines that will transmit data under the radio frequency by a microprocessor. The methods of loop measurement and line measurement are respectively discussed, and the method of using the microprocessor and the stored procedure are described. A block diagram of a microprocessor-based group delay meter is provided and evaluated. This is not only a reliable, inexpensive, but also a sophisticated telephone line group delay meter.