Media means something in between. The media is a medium for spreading information. It refers to the tools, channels, carriers, intermediaries or technical means used by people to transmit and obtain information, and also refers to the tools and means to transmit information such as words and sounds. Media can also be regarded as all technical means to realize the transmission of information from information sources to recipients.
Media has two meanings, one is the object that carries information, and the other is the entity that stores, presents, processes and transmits information. The four traditional media are television, radio, newspapers and weekly magazines. In addition, there must be outdoor media, such as advertising space for street sign light boxes.
CCITT divides the media into five categories:
1, sensory 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. Representation media: refers to the intermediary media that transmits sensory media, that is, the code used for data exchange. Such as image coding and sound coding.
3. Performance medium: refers to the medium 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, etc.
5. Transmission medium: refers to the physical medium of transmission medium. Such as cables and optical cables.