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随着数字电视、数字相机等产品的出现,表明了信息技术已开始步入数字化时代,预示着人类正在面临着一场新的信息技术革命。一、信息的数字化信息的数字化即用0和1来表达和传输所有信息,其中包括文字、图片、声音、书刊、电影电视等各种形式,其内容涉及到数字的转换、存取、处理、传输等一系列高技术。通常电信是利用模拟信号传送信息的。以电话为例,进行电话通信时,线路中传送的电信号的大小是随发话人声音大小、强弱而变化的,其信号的波形是连续的。传送该模拟信号的通信就成为模拟通信。而数字信号则使用一连串脉冲代表所要传送的信息,不同的脉冲组合代表不同的信息。因此数字信号波形是离散的、不连续的。由于脉冲只有有、无两种状态,因此可以用二进制数字0和1的组合来表示,信号便是二进制数字的形式,传送该信号的通信称之为数字通信。传统的电话、电视等是模拟通信,信息的数字化就是
With the advent of digital TV, digital camera and other products, it shows that information technology has begun to enter the digital era, indicating that mankind is facing a new revolution in information technology. I. Digitization of Information Digitization of information means that all information is expressed and transmitted using 0 and 1, including texts, pictures, sounds, books and periodicals, movies and televisions, etc. The content involves the conversion, access and processing of numbers, Transmission and a series of high-tech. Telecommunication usually uses analog signals to transmit information. Take telephone as an example. When carrying out telephone communication, the size of the electric signal transmitted in the line varies with the size and strength of the caller, and the signal waveform is continuous. The communication that transmits this analog signal becomes an analog communication. The digital signal uses a series of pulses to represent the information to be transmitted. Different pulse combinations represent different information. Therefore, the digital signal waveform is discrete and discontinuous. Because there are only two pulses, there are no two states, so it can be expressed by the combination of binary digits 0 and 1. The signal is in the form of a binary number. The communication that sends the signal is called digital communication. Traditional telephone, television and other analog communications, digital information is