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长距离微波传输所引起的电视图象闪动现象是影响电视图象质量的重要因素。本文比较全面地分析了产生这一现象的原因。由于多级视频交流耦合而造成的长时间信号失真,引起了电视信号的闪烁。与此同时,又导致电视信号动态范围增加,受到传输通道非线性的影响后,使同步信号压缩,从而引起电视图象的跳动。对模拟实验的结果进行了对比分析。还讨论了产生电视图象闪动的其他因素,提出了克服闪动现象的方法。
Long-distance microwave transmission caused by the phenomenon of television images flashing is an important factor affecting the quality of television images. This article analyzes the causes of this phenomenon in a more comprehensive way. Due to the multi-level video AC coupling caused by long-term signal distortion, causing the television signal flicker. At the same time, it also leads to the increase of the dynamic range of the television signal. After being affected by the non-linearity of the transmission channel, the synchronization signal is compressed, causing the television image to beat. The results of simulation experiments were compared and analyzed. Other factors that produce flashing of the television image are also discussed, and a method of overcoming the flashing phenomenon is proposed.