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数字技术的发展促进了科学技术的发展,尤其是促进了计算机的发展。AV 系统又为数字技术提供了新的发展天地。AV 系统的数字化大大促进了 AV 技术的发展,创造了令人耳目一新的 AV 新产品,例如 CD 机、VCD 机和 DVD 机等。为了使读者了解这些数字 AV 产品的工作原理,本文介绍数字AV 的基础知识。在数字 AV 中,首先成功的是数字音频(A),接着是数字视频(V)。就象在磁记录技术中录象机是在录音机的基础上发展起来的一样,VCD 机也是在 CD 机的基础上发展起来的。因此本文首先介绍音频信号的数字化,再介绍视频信号的数字化。读者有了音频信号数字化的基础,再了解视频信号数字化就容易了。
The development of digital technology has promoted the development of science and technology, especially the development of computer. AV system and digital technology has provided a new world of development. The digitization of the AV system has greatly facilitated the development of AV technology and created refreshing new AV products such as CD players, VCD players and DVD players. In order for the reader to understand how these digital AV products work, this article describes the basics of digital AV. In digital AV, first of all, digital audio (A) followed by digital video (V). As in the magnetic recording technology VCR is developed on the basis of the same recorder, VCD machine is also developed on the basis of the CD player. Therefore, this article first introduced the digitization of audio signals, and then introduced the digitization of video signals. Readers have a digital audio signal basis, and then understand the digital video signal is easy.