多制式这个概念,现已成为不少厂商及经销商误导消费者的一项宣传。其实,从彩色电视机能够接收到的无线电视广播信号的制式来讲,在全球范围内只有三种,即NTSC制式(用于美国、北美地区和日本)、PAL制式(用于中国大陆、北欧地区、德、英等国家),SECAM制式(用于俄罗斯、法国和东欧、北非等地区)。为方便读者了解,表1列出了彩色电视机制式的主要性能对比。就第二伴音中频频率来说,世界范围 The concept of multi-system, has now become a lot of manufacturers and distributors mislead consumers an advocacy. In fact, there are only three types of wireless television broadcast signals that can be received by color television sets in the world, that is, NTSC (for the United States, North America and Japan), PAL (for mainland China and North Europe Regions, Germany, Britain and other countries), SECAM (for Russia, France and Eastern Europe, North Africa and other regions). For the convenience of readers, Table 1 lists the main performance contrast color TV system. The frequency of the second sound intermediate frequency, the world