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随着科学技术的进步,近年来出现了一种电视机,除了能显示一个大的称为主画面的图像外,同时还能显示来自其它信号源的子画面图像,这种能在主画面的电视图像中同时显示出另一个子画面图像的电视机称为画中画(Picture in Picture,缩写为PIP)电视机。画中画电视机是怎样实现这种功能的呢?这种电视机可以是模拟式或数字式的。不管是模拟电视机还是数字电视机,接收到的都是电视台发射的经调制的模拟电视信号,在电视接收机的高放、中放等公共通道以及伴音功放和视频放大电路部分,都采用模拟信号的处理方式,而且都是在原来普通的电视机的基础上再加上子画面信号的处理系统构成的。下面以画中
With the advancement of science and technology, in recent years there has been a television set that, in addition to displaying a large image called the main picture, displays sub-picture images from other sources at the same time, Television sets displaying another sub-picture image in a television picture are called Picture in Picture (PIP) television sets. How can a picture-in-picture (TV) machine do this? The TV can be either analog or digital. Whether it is analog TV or digital TV, received by the television stations are modulated analog TV signals received in the high-television receiver, the public and other public channels and audio amplifier and video amplifier circuit are used analog Signal processing, and are all based on the original ordinary TV plus sprite signal processing system. Below to draw