彩电基板解码系统的研究与调试

The Measurement and Adjustment of Color Television Base Board Decoding System

色度信号解调器的调试是较复杂的一个问题，因为要调整的三个参数都会影响输出，要在输出中分别反应这三个量是有一定难度的为了说明这一问题，本文详细地讨论了各参数误差对输出的影响，从而寻找一种信号把三个量分别表示出来，达到了解调副载波初相位，色度信号初相位，色差信号的分离度三个量分别表示，因而减少了调试量，缩短了调试时间。

It is a complicated problem for adjustment of chromjname signal demedulator. Because three paraments which need to adjust will influeme outpnt. It is difficult to separate these three parameters' act on output. For illustrating this problem this paper dicussed the influence of every parameter's error for output in detail. Then to fond a signal which indicate three parameters separately was used to demodulate sub-carrier initial phase signal innal phase, separation of color difference signal respectirely. It results in reducing difficult of adjustment, decreasing time of adjustment and increusing accaracy of adjustment.