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电视发射机输入视频信号的幅度按我国电视标准规定应为1V_(p-p),但由于种种原因,其幅度往往不符合标准要求,本文分析信号幅度变化对发射和接收带来的影响。我国电视广播采用的是负极性调制(如图1所示)。我国电视标准规定,亮度信号特征电平的调制度:黑电平为25％,白电平为87.5％。正常情况下,电视发射机的调制度是在输入1V_(p-p),标准接口电平的全电视信号时调定的。
TV transmitter input video signal amplitude according to China’s television standards should be 1V_ (p-p), but due to various reasons, the amplitude often does not meet the standard requirements, this paper analyzes the signal amplitude changes on the launch and reception. China’s television broadcasting is the use of negative modulation (Figure 1). China’s television standards, brightness signal characteristic level modulation: black level of 25%, white level of 87.5%. Normally, the modulation level of the TV transmitter is set when the full TV signal of 1V_ (p-p), standard interface level is input.