With the development of science and technology, new media such as Internet TV and electronic magazines have gradually appeared. They are developed on the basis of traditional media, but they are qualitatively different from traditional media.
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The International Telephone and Telegraph Conference, a branch of the International Telecommunication Union, divides the media into five categories:
(1) Perceptual medium: refers to the medium that directly acts on human sensory organs and makes people feel directly. For example, sounds that cause auditory reactions, images that cause visual reactions, and the like.
(2) Performance media: refers to the intermediary media that transmits the sensory media, that is, the code used for data exchange. Such as image coding (JPEG, MPEG, etc. ), text coding (ASCII code, GB23 12, etc. ) and voice coding.
(3) Presentation media: refers to the media for information input and output. Such as keyboard, mouse, scanner, microphone, camera, etc. As an input medium; Monitors, printers, speakers, etc. It's an output medium.
(4) Storage media: refers to the physical media used to store the presentation media. Such as hard disk, floppy disk, magnetic disk, optical disk, ROM and RAM.
(5) Transmission medium: refers to the physical medium of transmission medium. Such as cables and optical cables.
What we usually call "media" includes two meanings. One refers to the physical carrier of information (that is, the entity that stores and transmits information), such as books, wall charts, disks, optical disks, tapes and related playback equipment; Another meaning refers to the expression (or communication) form of information, such as words, sounds, images, animations, etc. The medium mentioned by multimedia computer refers to the latter, that is, the computer can not only process information such as words and values, but also process various forms of information such as sound, graphics and TV images.