The media is the carrier of information. Multimedia refers to various forms of information carriers such as text, sound, graphics, and images.
Multimedia technology refers to the use of computer technology to comprehensively process text, audio, graphics, animation, static images, and motion video.
The development of multimedia technology has gone through two phases. In the first stage, the multimedia system basically works independently. In the second phase, the multimedia system was running on a broadband network and realized video conferencing, video on demand, telemedicine, and online shopping.
The basic content of multimedia technology The first problem to be solved by multimedia technology is the digital conversion of audio and video information.
Both audio and video information are analog signals that must be digitally converted and sent to computer memory for further processing with various software. The digitization process is achieved by analog/digital (A/D) conversion technology.
The digitized audio and video information has a large amount of data. Large-capacity storage devices, such as large-capacity hard disks and CD-ROMs, must be used. At the same time, data compression technology must be used.
The second problem to be solved by multimedia technology is the storage of digitized audio and video information.
The third problem to be solved by multimedia technology is the real-time requirements in the input and output of audio and video information.
Real-time performance first requires a high-speed processor chip. The MMX Pentium adds 57 multimedia instructions to the Pentium CPU's original command system, which can meet the needs of multimedia applications such as graphic image processing, MPEG video, music synthesis, speech recognition, and compression. Its performance is much lower than that of the same main frequency. Pentium CPU increased by 10% to 20%.
Multimedia information requires high-bandwidth network infrastructure when transmitted over the Internet.
Computer audio processing technology - waveform file audio processing technology - MIDI files MIDI is another method of computer-generated sound, it is a kind of electronic music. MIDI (.MID) files record instructions that produce a certain sound. Therefore, compared with the digitized sound file (.WAV), the storage capacity of the same music MID file is much smaller than that of the .WAV file. In addition, the .MID file is easy to modify, and the user can compose music on the computer by using the MIDI production software.
When a computer plays a MIDI file, there are two ways to synthesize sound: FM synthesis and wave table synthesis. FM synthesis simulates the sound of a musical instrument by mixing sounds at multiple frequencies. Wavetable synthesis stores sound samples of a musical instrument in a sound card waveform table, and takes them out of a waveform table during playback to generate sounds. Using wavetable synthesis techniques can produce more realistic sounds.
The "Media Player" in Windows can play MIDI music. It can also be played using the MIDI player software provided with the sound card.
The sound card interface sound card is a computer digital recording hardware interface. The process of collecting sound data and storing it on the disk through the A/D conversion function of the sound card is called digital recording. You can run recording software provided with the sound card during recording, or you can run the “recorder†software that comes with Windows. The sound data collected in Windows 95 is stored in the format of a Wave file (.WAV).
Replaying a waveform file through the sound card's D/A conversion function is a common method of computer-generated sound. The "recorder" in Windows can not only record but also play. It can also be played using the WAVE player software provided with the sound card.
The digital video signal is collected and compressed by the video signal collected by a video camera, a video recorder or a laser video disk player or a video signal transmitted by a receiving television station and stored on the hard disk or the optical disk after digital processing and hardware compression of the video capture card (viewing card). On the formation of digital video signals.
Video image data compression is achieved based on two basic facts. One is that there are many duplicate data in image data. Using mathematical methods to represent these data can reduce storage space. Compression based on this fact is lossless compression. The second fact is that people's eyes have limited ability to distinguish the details and colors of images, and the information that exceeds the resolution of the person can be removed and the purpose of data compression can also be achieved. Compression based on this fact is lossy compression.
Digital video signals have a very large amount of data. The data amount of one frame of medium-resolution true color image is 640×480×24≈7.37MB. The full dynamic transmission rate of 25 frames per second requires 7.37×25≈184 MB/s. The effective compression of data is a key technology that must be addressed in multimedia technology applications.
Video standard classification The video standard in multimedia is classified according to the compression method it uses. The common video standards in microcomputer systems fall into two categories: Windows AVI (Audio Video Interactive) file formats and MPEG (Moving Picture Experts Group) file formats.
The popular VCD now uses the MPEG format, and early playback of the VCD requires a special decompression card (movie card). With the continuous improvement of computer hardware and software technology, it has become a trend to use software to perform digital video decompression and playback. Common player software includes Kingsoft Films, XingMPEG Player and so on.
The production of digital video files depends on specialized software and technology.
Digital video files in AVI format can be played back with a media player in Windows.
Multimedia technology refers to the use of computer technology to comprehensively process text, audio, graphics, animation, static images, and motion video.
The development of multimedia technology has gone through two phases. In the first stage, the multimedia system basically works independently. In the second phase, the multimedia system was running on a broadband network and realized video conferencing, video on demand, telemedicine, and online shopping.
The basic content of multimedia technology The first problem to be solved by multimedia technology is the digital conversion of audio and video information.
Both audio and video information are analog signals that must be digitally converted and sent to computer memory for further processing with various software. The digitization process is achieved by analog/digital (A/D) conversion technology.
The digitized audio and video information has a large amount of data. Large-capacity storage devices, such as large-capacity hard disks and CD-ROMs, must be used. At the same time, data compression technology must be used.
The second problem to be solved by multimedia technology is the storage of digitized audio and video information.
The third problem to be solved by multimedia technology is the real-time requirements in the input and output of audio and video information.
Real-time performance first requires a high-speed processor chip. The MMX Pentium adds 57 multimedia instructions to the Pentium CPU's original command system, which can meet the needs of multimedia applications such as graphic image processing, MPEG video, music synthesis, speech recognition, and compression. Its performance is much lower than that of the same main frequency. Pentium CPU increased by 10% to 20%.
Multimedia information requires high-bandwidth network infrastructure when transmitted over the Internet.
Computer audio processing technology - waveform file audio processing technology - MIDI files MIDI is another method of computer-generated sound, it is a kind of electronic music. MIDI (.MID) files record instructions that produce a certain sound. Therefore, compared with the digitized sound file (.WAV), the storage capacity of the same music MID file is much smaller than that of the .WAV file. In addition, the .MID file is easy to modify, and the user can compose music on the computer by using the MIDI production software.
When a computer plays a MIDI file, there are two ways to synthesize sound: FM synthesis and wave table synthesis. FM synthesis simulates the sound of a musical instrument by mixing sounds at multiple frequencies. Wavetable synthesis stores sound samples of a musical instrument in a sound card waveform table, and takes them out of a waveform table during playback to generate sounds. Using wavetable synthesis techniques can produce more realistic sounds.
The "Media Player" in Windows can play MIDI music. It can also be played using the MIDI player software provided with the sound card.
The sound card interface sound card is a computer digital recording hardware interface. The process of collecting sound data and storing it on the disk through the A/D conversion function of the sound card is called digital recording. You can run recording software provided with the sound card during recording, or you can run the “recorder†software that comes with Windows. The sound data collected in Windows 95 is stored in the format of a Wave file (.WAV).
Replaying a waveform file through the sound card's D/A conversion function is a common method of computer-generated sound. The "recorder" in Windows can not only record but also play. It can also be played using the WAVE player software provided with the sound card.
The digital video signal is collected and compressed by the video signal collected by a video camera, a video recorder or a laser video disk player or a video signal transmitted by a receiving television station and stored on the hard disk or the optical disk after digital processing and hardware compression of the video capture card (viewing card). On the formation of digital video signals.
Video image data compression is achieved based on two basic facts. One is that there are many duplicate data in image data. Using mathematical methods to represent these data can reduce storage space. Compression based on this fact is lossless compression. The second fact is that people's eyes have limited ability to distinguish the details and colors of images, and the information that exceeds the resolution of the person can be removed and the purpose of data compression can also be achieved. Compression based on this fact is lossy compression.
Digital video signals have a very large amount of data. The data amount of one frame of medium-resolution true color image is 640×480×24≈7.37MB. The full dynamic transmission rate of 25 frames per second requires 7.37×25≈184 MB/s. The effective compression of data is a key technology that must be addressed in multimedia technology applications.
Video standard classification The video standard in multimedia is classified according to the compression method it uses. The common video standards in microcomputer systems fall into two categories: Windows AVI (Audio Video Interactive) file formats and MPEG (Moving Picture Experts Group) file formats.
The popular VCD now uses the MPEG format, and early playback of the VCD requires a special decompression card (movie card). With the continuous improvement of computer hardware and software technology, it has become a trend to use software to perform digital video decompression and playback. Common player software includes Kingsoft Films, XingMPEG Player and so on.
The production of digital video files depends on specialized software and technology.
Digital video files in AVI format can be played back with a media player in Windows.
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