Improvement of the official examinations for the signal quality of the cable TV systems in Taiwan: the modification of the automatic measurement software

摘要

This study presents the modification of the program using the HP VEE to promote the portability of the measurement equipment for the official examinations for signal quality of cable TV (CATV) systems in Taiwan. This program is designed to communicate between the head end and the user end with modems. In the previous version of the examination procedures, the official inspectors of the Directorate General of Telecommunications have to bring the CATV spectrum analyzer, active filter, video measurement set, down converter, and demodulator connected with a notebook to measure the parameters of the signal quality at the user end. The goal of this study is to modify the enormous program which are inter-talking at the two ends by skipping the measurement of the K factor to reduce the equipment to be only a CATV spectrum analyzer and an active filter. By the HP VEE, we can easily set the instruments in the pseudo mode. Therefore, we can modify the program to skip the measurement of the detached machine to achieve our goal. We have easily modified and tested this enormous inter-talking program without query to the original programmers because of the complete graphical programming solutions by linking visual objects or icons of the HP VEE.