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1-4.同步分离管的基极在输入正极性或负极性全电视信号时,分别应选取什么类型的晶体管?为什么? 答:同步分离管的任务是将全电视信号中的同步脉冲分离出来.对于正极性全电视信号来讲,图象信号在消隐电平以上,而同步脉冲在消隐电平以下,所以可采用幅度分离的方式将同步脉冲取出.要求同步分离电路仅在同步脉冲期间导通,此时应有同步脉冲输出,而在图象信号期间电路断开,不应该有信号输出. 在正极性的全电视信号中,同步脉冲可看作负极
1-4. Sync the base of the splitter What type of transistor should each be selected for positive or negative full TV signal input? Why? A: The sync splitter’s job is to separate the sync pulse from the full TV signal For positive full TV signal, the image signal is above the blanking level and the sync pulse is below the blanking level, so the sync pulse can be removed by means of amplitude separation. During the conduction, this time should be synchronized pulse output, and in the image signal during the circuit is disconnected, there should be no signal output in the positive all-TV signal, the sync pulse can be seen as the negative