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1 引言 近年来,对电视信号进行加扰已成为国外许多发达国家广播电视,特别是卫星直播电视发展的一种重要技术手段。各种制式的电视信号加扰系统层出不穷。如美国的Video Cipher Ⅱ方式,B-NTSC方式,欧洲的Euro-crypt方式,日本的BS依据加扰方式、M方式和B-MAC方式等。在国内,随着我国有线电视事业的蓬勃发展,电视信号加扰已经提到议事日程上来,已有一
1 Introduction In recent years, the scrambling of television signals has become an important technical measure for the development of radio and television broadcasting in many developed countries, especially satellite live television. A variety of standard television signal scrambling system after another. Such as Video Cipher Ⅱ mode in the United States, B-NTSC mode, Euro-crypt mode in Europe, BS in Japan based on scrambling mode, M mode and B-MAC mode. In China, with the vigorous development of China’s cable television business, scrambled television signals have been mentioned on the agenda, there is a