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当今信息世界出现两股推动信息技术发展潮流,一是大功率计算机微型化;一是信息数字化。 自亚历山大·贝尔发明电话以来,至本世纪80年代,模拟系统(连续信号处理方式)是最流行的电信技术,即在视听器材上模拟波的变化。例如,在一张乙烯唱片上再现波的振荡。我们知道,这种模拟系统极易受到灰尘、潮湿、划破等外界因素影响而使声音改变,电话也一样。然而,70年代末80年代初发展起来的数字技术恰好弥补了模拟
There are two shares in the information world to promote the development trend of information technology. One is the miniaturization of high-power computers. The other is digitalization of information. Since the call was made by Alexander Bell until the 1980s, analog systems (continuous signal processing) are the most popular telecommunications technologies that simulate wave changes in audio-visual equipment. For example, the oscillation of a wave is reproduced on an vinyl record. We know that this simulation system is extremely susceptible to changes in sound due to external factors such as dust, humidity and scratching, as well as the telephone number. However, the digital technology developed in the late 1970s and early 1980s fills the simulations