The English word for Multimedia (du not mé i t ǐ) is multimedia, which consists of two parts: media and multi. Generally understood as the synthesis of various media.
Media is the intermediary to realize information exchange between people. In short, it is the carrier of information, also known as media. Multimedia means multimedia, which can be understood as the general name of various media such as words, graphics, images, animations, sounds, videos, etc., which directly affect people's senses, that is, the forms of expression and modes of communication of various information carriers.
Multimedia MMS (Multimedia Message Service) is one of the highest standards for the development of short message technology. Its biggest feature is that it can support multimedia functions. With the help of high-speed transmission technologies such as edge (enhanced data rate of GSM e-operation) and GPRS, WAP is used as the carrier to transmit video clips, pictures, sounds and words, which can not only transmit multimedia between mobile phones. It can also be transmitted between the mobile phone and the computer; The average short message capacity is 30,000 bytes, and the maximum can reach 654.38+ million bytes. The mobile phone with MMS function has a built-in media editor, which can write multimedia information. If a built-in or external camera is installed, users can also make and transmit information or electronic postcards in PowerPoint format.
Multimedia technology is not a simple combination of various information media. It is an information technology that combines information in the form of words, graphics, images, animations and sounds, and is comprehensively processed and controlled by a computer, which can support a series of interactive operations. The development of multimedia technology has changed the application field of computers, which has changed computers from special products in offices and laboratories to ordinary tools in the information society, and has been widely used in industrial production management, school education, public information consultation, commercial advertisements, military command and training, and even family life and entertainment.
[Edit this paragraph] Multimedia analysis
Multimedia is a combination of computer and video technology, which is actually two kinds of media; Sound and images, or in the current terminology: sound and television. Multimedia itself has two aspects. Like all modern technologies, it consists of hardware and software, or a mixture of machines and ideas. Conceptually, multimedia technology and functions can be divided into control system and information. Multimedia can be realized by digital technology. Multimedia represents the integration of digital control and digital media. Computer is a digital control system, and digital media is the most advanced storage and dissemination form of audio and video. In fact, some people simply think that multimedia is a combination of computer and TV. The ability of computer reaches the level of real-time processing of TV and sound data streams, so multimedia is born. Multimedia computers need to have stronger capabilities than mainstream computers, and multimedia computers determine the development of mainstream computers. The main things that distinguish ordinary computers from multimedia computers are sound cards and CD-ROM drives. CD is the main storage and exchange medium of multimedia. Without this convenient CD-ROM, the computer industry can't sell hundreds of megabytes of audio, video and text data that make up multimedia programs, and you can't buy multimedia.
Now you can answer what multimedia is. It is not just one thing, but a complex combination of many things: hardware, software and the interface when they meet. No, we forgot the most important thing. Multimedia also includes you. Well, yes! For multimedia, you are no longer a passive audience, you can control it, you can interact with it, and you can make it do what you need. In a report, you can go directly to find important data regardless of those useless things, and you can sort out reports and photo collections from all over the world that you are interested in. This is the power of multimedia and the difference between it and traditional media (such as books and TV).
What can multimedia do? It displays information, exchanges ideas and expresses emotions. It allows you to see, hear and understand other people's ideas. In other words, it is a way of communication. Sound, images, graphics, text, etc. It is not accurate because it is easily confused with material media (also called media) that carry information for transmission and storage, such as electromagnetic wave, light, air waves, current, magnetic media and so on. Nowadays, however, the term multimedia is almost synonymous with words, graphics, images and sounds. In other words, most people think that multimedia is a combination of sound, image and graphics, so this inaccurate word has been used in general articles. At present, the popular multimedia concept mainly refers to a variety of information types that can be directly felt and understood by organs such as words, graphics, images and sounds, which has become a narrow understanding of multimedia.
In the field of computer and communication, what we mean by words, graphics, sounds, images and animations can all be called media. From the perspective of information processing by computers and communication equipment, we can classify the forms of original information in nature and human society-data, words, spoken language, sound, painting, animation and images (still photos and moving movies, television and video) into three basic media: sound, picture and text. Traditional computers can only deal with a single medium-"text", and television can spread information that integrates sound, picture and text, but it is not a multimedia system. Through TV, we can only passively accept information from one direction, but can't actively process information from two directions, so there is no so-called interactivity. Although videophone is interactive, we can only hear the sound and see the image of the speaker, and it is not multimedia. The so-called multimedia refers to the technology that can simultaneously collect, process, edit, store and display two or more different types of information media, including words, sounds, graphics, images, animations and moving images.
In daily life, there are many things called media, such as bees spreading pollen and flies spreading germs. But accurately speaking, these so-called "media" are communication media, not what we call "media" in multimedia, because these communication media are all some kind of material entities, while words, sounds, images and graphics are not material entities, they are only the superficial characteristics of some attributes of objective things, and they are a way of expressing information. What we call "media" in the field of computer and communication is the carrier of information storage, dissemination and expression, not the general media and media.
Conceptually speaking, "media" in multimedia should refer to a form of expressing certain information content. Similarly, we can know that the multimedia we refer to should be the expression of various information or the types of various information. Naturally, we can use the concept of multimedia information to represent comprehensive information types containing different information types, such as text information, graphic information, image information and sound information.
In a word, because the most essential concept of information is the superficial characteristics of objective things' attributes, and its manifestations are various, a more accurate and comprehensive definition of multimedia should refer to the synthesis of various information types.
These media can be graphics, images, sounds, characters, videos, animations and other forms of information expression, display devices such as monitors, speakers and televisions, intermediate media such as optical fibers, cables and electromagnetic waves that transmit information, and storage entities such as magnetic disks, optical disks and magnetic tapes that store information.
[Edit this paragraph] The characteristics of multimedia
Multimedia technology has the following main features:
(1) integration can acquire, store, organize and synthesize information through multiple channels.
(2) Controlled multimedia technology is a computer-centered comprehensive processing and control of multimedia information, which is displayed in various media forms according to people's requirements and acts on people's various senses at the same time.
(3) Interactivity Interaction is one of the main characteristics that distinguish multimedia applications from traditional information exchange media. Traditional information communication media can only spread information in one direction and passively, while multimedia technology can realize people's active choice and control of information.
(4) The nonlinear characteristics of nonlinear multimedia technology will change people's traditional sequential reading and writing mode. In the past, people mostly used the framework of chapters, sections and pages to acquire knowledge step by step, while multimedia technology will present the content to readers in a more flexible way with the help of hypertext links.
(5) Real-time when the user issues an operation command, the corresponding multimedia information can be controlled in real time.
(6) Convenience of information use Users can use information according to their own needs, interests, task requirements, preferences and cognitive characteristics, and take any form of information such as pictures, words and sounds.
(7) Dynamic information structure "Multimedia is a book that can never be read". Users can reorganize information, add, delete or modify nodes and re-establish links according to their own purposes and cognitive characteristics.
[Edit this paragraph] Multimedia Common Sense
The first basic concept of multimedia
1. The definition of multimedia
The word "Multimedia" is translated from the English word "multimedia", which is a compound of mutiple and media. The original meaning of media is twofold. One refers to entities that store information, such as magnetic disks, optical disks, magnetic tapes, semiconductor memories, etc. , which is often translated into media in Chinese, refers to the carrier of information, such as numbers, words, sounds, graphics and so on. And Chinese translation as a medium. So the word for multimedia is Monomedia. Literally, multimedia is composed of mono media.
Multimedia technology has different definitions from different angles. For example, some people define that "a multimedia computer is a set of hardware and software equipment; Combining various visual and auditory media can produce impressive audio-visual effects. In visual media, it includes graphics, animation, images and words, while in auditory media, it includes language, stereo and music. Users can access various media sources from multimedia computers at the same time. " Others define multimedia as "the combination of traditional computing media (words, graphics, images and logical analysis methods) with video, audio and interactive applications for knowledge creation and expression". To sum up, multimedia technology is the interactive comprehensive processing of multimedia information-words, graphics, images and sounds by computers, which makes all kinds of information logically linked and integrated into a system for interaction. In short, multimedia technology is a computer technology that comprehensively processes audio, video and graphic information, which is integrated, real-time and interactive. )。 Multimedia has its own definition in China. It is generally believed that multimedia technology refers to the technology that can handle information on various carriers (media) and information on various storage bodies (media).
2. Key technologies of multimedia
Because the multimedia system needs to achieve a unified structure code stream of different media data tables, and then convert, reorganize and analyze them for further storage, transmission, output and interactive control. Therefore, the traditional key technologies of multimedia mainly focus on the following four categories: data compression technology, large-scale integrated circuit (VLSI) manufacturing technology, large-capacity optical disk, and real-time multi-task operating system. Due to the breakthrough in these technologies, multimedia technology has developed rapidly and become a high-tech technology with strong ability to handle media information such as sound, text and images as it is today.
However, when talking about the key multimedia technologies to be used in the Internet, some experts think that it can be divided into six aspects: media processing and coding technology, multimedia system technology, multimedia information organization and management technology, multimedia communication network technology, multimedia man-machine interface and virtual reality technology, and multimedia application technology. It should also include multimedia synchronization technology, multimedia operating system technology, multimedia middleware technology, multimedia exchange technology, multimedia database technology, hypermedia technology, content-based retrieval technology, QoS management technology in multimedia communication, multimedia conference system technology, multimedia video-on-demand and interactive TV technology, virtual reality space technology and so on.
3. Components of Universal Multimedia System
A general multimedia system consists of the following four parts:
Multimedia hardware system, multimedia operating system, media processing system tools and user application software.
★ Multimedia hardware system: including computer hardware, audio/video processor, various media input/output devices and signal conversion devices, communication transmission devices and interface devices. Among them, the most important ones are multimedia information processing chips, boards and optical disk drives developed according to multimedia technical standards.
★ Multimedia operating system: or multimedia kernel system, with real-time task scheduling, multimedia data conversion and synchronous control to drive and control multimedia devices, graphical user interface management and other functions.
★ Media processing system tool: or multimedia system development tool software, which is an important part of multimedia system.
★ User application software: an application software customized according to the requirements of the end users of multimedia systems or a user application software system in a certain field, which is a system product for large-scale users.
Composition of the second multimedia computer
1. Interpretation of Multimedia Personal Computer
Before the emergence of multimedia computers, the information processed by traditional microcomputers or personal computers was often limited to words and numbers, which could only be regarded as the primary stage of computer application. At the same time, because the interaction between man and machine can only be through keyboard and display, the way of exchanging information lacks diversity. In order to change the interface of human-computer interaction and enable computers to integrate sound, text, graphics and image processing, humans invented computers with multimedia processing capabilities. Let's focus on the personal computer (that is, the PC now). So now you should understand that the so-called Multimedia Personal Computer (MPC) is nothing more than a personal computer with multimedia processing function (such as the early 586 model), and its hardware structure is not much different from the commonly used personal computer, only adding some software and hardware configurations. There are probably two ways for ordinary users to own MPC: one is to buy a PC with multimedia function directly; The second is to add a multimedia suite to the basic PC to form MPC. Today, when PC II is rampant, MPC has become a necessary technical specification for computer manufacturers and developers.