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在采用频率合成器技术的电视发射机中,由于鉴相频率与电视行频不同步常常造成鉴频干扰画面的现象。本文讨论了采用视频行同步脉冲作辅助鉴相的技术克服鉴频干扰的方法,并简述了异或门鉴相器的工作原理。
In the television transmitter using the frequency synthesizer technology, the phenomenon of frequency interference interference picture often occurs due to the lack of synchronization between the phase frequency and the television line frequency. This article discusses the use of video line sync pulse auxiliary phase detection technology to overcome the discriminating interference method, and briefly describes the working principle of the XOR gate detector.