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This article mainly introduces the characteristics of multimedia communication, the article is very detailed, has a certain reference value, interested friends must read it!

The characteristics of multimedia communication are as follows: 1. Integration refers to the ability to store, transmit, process and display four types of information: content data information, multimedia and hypermedia information, script information and specific application information. 2. Interactivity. 3. Synchronization means that the images, sounds and words displayed on the multimedia communication terminal work synchronously.

The operating environment of this tutorial: windows7 system, Dell G3 computer.

Multimedia communication refers to the communication that can provide multimedia information transmission, the main body of which is multimedia, that is, text, data, graphics, animation, image, voice, voice, video, etc., as well as the different combinations of them, but it must include a time-based media, such as voice or video.

Multimedia communication is the product of the combination and development of multimedia technology, computer technology, communication technology and network technology.

The generating conditions of Multimedia Communication

1. Rapid development of information processing, computer and communication technology

In the early 1980s, famous computer companies in the United States, Japan and Europe began to devote themselves to the research of multimedia technology, including the rapid development of multimedia computer technology, including information compression coding, multimedia storage and graphic synthesis and synchronization. With the development of modern communication network technology (digital switching technology and transmission technology), multimedia communication technology combined with multimedia computer technology integrates all kinds of media information and realizes multimedia communication with full development, communication and utilization of information.

2. The demand for multimedia communication in the information society

In the 1990s, the competition among enterprises is becoming increasingly fierce. In the business activities of enterprises, information processing and communication are becoming more and more important. With the help of advanced communication systems, we can shorten the time for products to be put on the market, improve services to users, and reduce travel expenses, so modern enterprises must rely on high-quality information and strong information acquisition ability to be in an invincible position. For individuals, as the living environment is becoming more and more complex and the pace of life is getting faster and faster, it is hoped that communication can ensure that he can get information at any time, and use computer supported Cooperative work (CSCW) to improve work efficiency. Therefore, the traditional communication system has been unable to fully meet the needs of people for communication, only the construction of multimedia communication system is the solution.

The characteristics of Multimedia Communication

The key characteristics of multimedia communication are closely related to the key characteristics of multimedia, and in the process of communication, it reflects not only the diversification and integration of information carriers and systems, but also the interaction and synchronization of communication methods. To sum up, the key characteristics of multimedia communication are reflected in the integration, interaction and synchronization of multimedia communication. Generally speaking, a communication system with these three characteristics at the same time can be called a multimedia communication system.

1. Integration

The integration in multimedia communication system refers to the ability to store, transmit, process and display four types of information: content data information, multimedia and hypermedia information, script information and specific application information.

Content data (Content Data) information refers to the information represented by the coding standard of a single media, including text, two-dimensional and three-dimensional graphics, still image (continuous tone), binary image, sound (voice, music, noise) and moving image (animation, moving image), etc. Multimedia and hypermedia information (MHI) is different from single media information, they are structured information, which is composed of structural framework and content data. Multimedia and hypermedia objects can be represented and encoded by their appropriate standards in a real-time switching environment, and some presentation standards of single media should be used. Script information is a group of structured multimedia and hypermedia information associated with a specific semantic relationship. It is necessary to provide the operation process of this group of multimedia information and the relationship with external processing modules. Different from the three types of low-level information mentioned above, the specific application information is high-level information, which is closely related to the application, and varies greatly due to different applications. Unlike the first three types of information, it does not have a general representation (for example, it can be defined and represented by standards), its representation is based on the above three categories. Directory information is a typical specific application information.

2. Interactivity

Interactivity refers to the ability of mutual control between people and systems in communication. In the multimedia communication system, the interaction has two aspects: one is the man-machine interface, which is the operation interface provided by the user terminal to the user when using the terminal of the system; the other is the application layer communication protocol between the user terminal and the system.

The man-machine interface is the operation interface provided by the system to the user. At present, the best man-machine interface that can be used in multimedia communication system is the man-machine interface based on Windows. Windows man-machine connection VI is a graphic-based interface, which can provide many kinds of complex man-machine interfaces, such as menu, button, selection box, list item, input field, dialog box, sensitive area, sensitive field and so on, to meet the needs of complex interactive operation of multimedia communication system. It should be pointed out that there is a great difference between the man-machine interface based on windows and the windows of PC in multimedia communication system.

All the operations of PC windows are local operations, while the man-machine interface of multimedia communication systems based on windows is not local operation at all, but the interactive operation between the local terminal and the remote host. Every action, such as popping up a menu and giving a list item, is controlled by the remote host, so it is a very complex communication process.

In addition to the man-machine interface, another aspect of interaction in the multimedia communication system is the application layer communication protocol between the user terminal and the system. In the multimedia communication system, many kinds of representation media can be stored, transmitted, processed and displayed, and there is a complex synchronous relationship between these representation media, and different representation media can be transmitted to the user in serial form or concurrent form, so that the user terminal can reproduce multimedia information according to the synchronization relationship.

Obviously, in the multimedia communication system, the single-channel communication protocol is not enough, so we need a multi-channel communication protocol which can support multi-channel working at the same time. In the multi-channel communication protocol, in addition to establishing a primary channel to support the core interaction of the system, it is also necessary to establish several auxiliary channels to provide the transmission of concurrent information, so as to achieve a perfect interactive process of multimedia communication.

Users of multimedia communication terminals have complete interactive control over the whole process of communication, which is not only a main feature of multimedia communication systems, but also a main criterion to distinguish multimedia communication systems from non-multimedia communication systems. For example, digital color TV can process a variety of presentation media (image coding, sound coding), and can also display a variety of sensory media (picture, text, sound). However, in addition to channel switching to select programs, it is impossible to effectively select and control its whole process, so the color TV system is not a multimedia system. Video on demand (VideoonDemand,VOD) system is different, users can effectively control the whole process, such as control playback, pause, fast forward, fast back and so on. Therefore, VOD system is a multimedia communication system.

3. Synchronization

Synchronization means that the image, sound and text displayed on the multimedia communication terminal work synchronously. For example, the user wants to retrieve a segment of an important historical event, the moving image (or still image) of the event is stored in the image database, and the text description and language description are placed in other databases. The multimedia communication terminal extracts the needed information from different databases through different transmission channels, and synchronizes the sound, image and text to form a whole information to be presented to the user, so that the sound, image and text can be synchronized, and the synchronized information is sent to the user.

Synchronization in multimedia communication system is one of the most important features in multimedia communication system. It can be said that whether the information is synchronized or not determines whether the system is a multimedia system or a multi-media system.

In multimedia communication systems, synchronization can be achieved at three levels: link level, presentation level and application level. However, not all multimedia communication systems must have synchronization at these three levels at the same time, but it must use at least one of the synchronization methods. Of course, the more synchronization methods are used, the better the performance of the system.

In a word, for the multimedia communication system, the three characteristics of integration, interaction and synchronization must coexist, and without one of them, it can not be called multimedia communication system.

These are all the contents of the article "what are the characteristics of multimedia communication?" Thank you for your reading! Hope to share the content to help you, more related knowledge, welcome to follow the industry information channel!

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