What are the two major components of a multimedia computer system?

The two major components of a multimedia computer system are: 1. Multimedia hardware system, which mainly includes the main configuration of the computer and various external devices and control interface cards with various external devices; 2. Multimedia software system, which mainly Including multimedia driver software, multimedia operating system, multimedia data processing software, multimedia creation tool software and multimedia application software.

The operating environment of this tutorial: Windows 10 system, DELL G3 computer.

What are the two major components of a multimedia computer system

The multimedia system consists of two parts: 1. Multimedia hardware system; 2. Multimedia software system.

The hardware system mainly includes: main computer configuration and various external devices and control interface cards with various external devices (including multimedia real-time compression and decompression circuits), and the software system includes multimedia driver software , multimedia operating system, multimedia data processing software, multimedia creation tool software and multimedia application software.

Multimedia system refers to a system that uses computer technology and digital communication network technology to process and control multimedia information. In a broad sense, a multimedia system is an integrated information system that integrates telephone, television, media, and computer networks.

In a narrow sense, a multimedia system is a computer system with multimedia functions;

In a broad sense, a multimedia system is an information integration that integrates telephone, television, media, and computer networks. system.

Android's multimedia system mainly includes Java framework layer, C language framework layer (Media API) and OpenCore. The Java framework layer is connected to the Java application layer. Between the Java framework layer and the C language framework layer is the Java local calling part (Media JNI). The core of the C language part of the Android multimedia part is the media library, which mainly provides the framework of media players and media recorders. The media library provides an interface to the upper layer through JNI, and the lower layer is implemented through Packet Video, etc.

Types of multimedia information

Overview

Multimedia information includes text, graphics, images, sounds, movies, There are many different forms such as animations. Different types of media have different content and formats, and the corresponding content management and processing methods are also different, and the storage capacity is also very different.

Text

Text is the main form of communication between people in the real world, and it is also the main medium for information exchange between people and computers. In computers, text is represented by binary coding, that is, different binary codes are used to represent different text. Commonly used characters include Western and Chinese characters.

(1) Western character encoding. In computers, Spanish is represented by ASCII (American Standard Code for Information Interchange, American Standard Code for Information Interchange) code. The ASCII code includes a total of 128 characters including uppercase and lowercase English letters, punctuation marks, Arabic numerals, mathematical symbols, control characters, etc. One ASCII code occupies one byte and is composed of 7-bit binary encoding.

(2)Chinese character encoding. Chinese character encoding includes: Chinese character input encoding, Chinese character internal code and Chinese character model code.

Input encoding of Chinese characters. Western characters can be input directly into the computer through the keyboard, but Chinese characters are different. To use the keyboard to input Chinese characters, you must design corresponding input encoding methods for Chinese characters, such as Microsoft Pinyin input method, Wubi input method, etc.

Chinese character internal code. No matter what encoding is used to input Chinese characters, each Chinese character is represented by a unique code inside the computer - the Chinese character internal code. The Chinese character internal code is an internal code used for the storage, exchange, retrieval and other operations of Chinese character information. The current Chinese character encoding has two bytes, three bytes or even four bytes. Among them, GB231280 (National Standard Chinese Character Code for Information Exchange, referred to as the National Standard Code) is a two-byte code that uses two 7-bit binary numbers to encode one Chinese character. Within the computer, Chinese character encoding and Western encoding coexist. In order to distinguish each other, the national standard code stipulates that the highest bit of the two bytes is 1, while the highest bit of the byte used in the ASCII code is 0, and then the software ( or hardware) based on the highest bit of the byte.

Chinese character model code. The font code is a Chinese character glyph code represented by a dot matrix, which is the output form of Chinese characters. According to the different requirements for Chinese character output, the number of dots is also different. Simple Chinese characters are 16×16 dot matrix, and advanced Chinese characters are 24×24 dot matrix, 32×32 dot matrix, or even higher. Therefore, the amount of information in the font matrix is ​​very large, and the storage space it occupies is also very large. For example, each Chinese character in a 16×16 dot matrix takes up 32 bytes, while each Chinese character in a 32×32 dot matrix takes up 128 bytes.

It can be seen that the input encoding of Chinese characters, the internal encoding of Chinese characters, and the character pattern encoding are encodings used for three different purposes in computers: input, internal processing, and output.

The traditional text input method is to use a keyboard for input. Text can be input directly to the computer through a handwriting input device, or text can be automatically recognized for input through optical symbol recognition (OCR) technology. The ideal input method is to use voice input, so that the computer can understand the human language and convert it into internal code. At the same time, the computer can pronounce words according to the text, truly realizing "human-computer dialogue". This is exactly what multimedia means. Problems that technology needs to solve.

Graphics

Graphics refer to geometric figures represented by points, lines, surfaces and three-dimensional space. In geometry, geometric elements are usually represented by vectors, so graphics are also called vector graphics. Vector graphics are represented by a set of instructions, which are used to describe the shape, position, color and other attributes and parameters of the straight lines, rectangles, circles, arcs, curves, etc. that make up a picture.

Image

The image is a matrix, whose elements represent a point in space, called a pixel (Pixel). The color and brightness of each pixel are represented by binary numbers. To represent, this kind of image is also called a bitmap. For black and white images, a 1-bit value is used. For grayscale images, 4 bits (16 gray levels) or 8 bits (256 gray levels) are commonly used to represent the brightness of a certain point. Color images have multiple description methods. . Bitmap images are suitable for images that are more detailed, have richer levels and colors, and contain a lot of details.

Sound

Sound is an important part of multimedia information and an indispensable medium for expressing thoughts and emotions. Sound mainly includes three types: waveform sound, speech and music. Sound is a vibration wave, and waveform sound is the most general form of sound, which includes all sound forms; speech is a waveform sound that contains rich language connotations. People can abstract speech and extract its specific components. , so as to achieve an understanding of its meaning. It is a special medium in sound; music is a symbolized sound. Compared with speech, its form is more standardized. For example, in music, the score is the specification of the music. Form of expression.

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