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全世界存在着数种彩色电视制式,但其中应用最多的是具有彩色/黑白电视节目兼容的NTSC、PAL、SECAM三种制式,这三种制式各有其优点,以至它们可以长期共存,其他制式便逐渐地淘汰了。但是,在世界某地购买的电视机,则可能因为电视制式的不同,在另一地方不能正常收看甚至根本无法收看。以往所采取的解决这一问题的措施是对接收机进行制式改变,相当于重新对其制式进行设计,这显然比较麻烦而又十分不经济。本文以JVC公司的AV-20ME彩色电视机为例,介绍一种以电路实现制式自动转换的方法。
There are several types of color television systems in the world, but among them the most widely used are NTSC, PAL and SECAM compatible with color / black and white television programs, each of which has its own advantages so that they can coexist for a long time. Other standards It gradually eliminated. However, the television sets purchased in some parts of the world may not be able to watch or can not be watched elsewhere because of differences in television systems. The measures taken to solve this problem in the past are to change the standard of the receiver, which is equivalent to redesigning its system. This is clearly a troublesome and uneconomical one. In this paper, JVC AV-20ME color TV as an example, to introduce a circuit to achieve automatic conversion method.