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本文根据调频电视信号的特点和国内外在研制用于调频电视信号的门限扩展解调电路方面的现状,对选择跟踪滤波器型解调电路进行了分析和实验;介绍了电路的组成和对各部分的要求;对该解调方式的关键问题——跟踪问题作了较为详细的分析,介绍了两种跟踪方式。低频跟踪方式和低频色副载频跟踪方式。最后给出了实验结果和达到的指标,并和一般的限幅鉴频解调方式进行了比较,作出了总体评价。
Based on the characteristics of FMTV signal and the current situation of developing threshold demodulation circuit for FMTV signal at home and abroad, this paper analyzes and experiments the selection of tracking filter type demodulation circuit. Part of the requirements; the key issue of the demodulation - Tracking issues made a more detailed analysis of the two tracking methods introduced. Low frequency tracking mode and low frequency color subcarrier tracking. Finally, the experimental results and indicators are given, and compared with the general limit frequency demodulation demodulation, made an overall evaluation.