Many of these concepts are the same in digital video systems. Section 2.3 presents the basic concepts of analog video systems. Many digital images and video are generated from analog video. The analog-to-digital conversion (ADC) principle will be used when we discuss digital representation of video in Section 2.4. We study the properties of analog audio signals, the process of converting analog signals to digital signals, and digital representations of common audio applications. The objective of this chapter is to discuss the basic characteristics and system requirements of digital audio, video and image. Thus an understanding of these characteristics and requirements is essential to understanding the issues in multimedia computing and communications. The differences between a multimedia system and a conventional computing system stem from the different characteristics and requirements of multimedia information from the traditional alphanumeric data. It is implied that at least one media type is a time-continuous medium. Thus when we say multimedia data, we refer to digital representations of multiple media types. In Chapter 1 we defined a multimedia system as being capable of simultaneously supporting the processing and communication of multiple media types with at least one time-continuous medium, such as digital audio and video.
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