Main functions of sound card
Sound Card (Sound Card) is also called audio card (RTHK calls it sound card). Sound card is the most basic component of multimedia technology, and it is a kind of hardware to realize the conversion of sound wave\/digital signal. The basic function of the sound card is to convert the original sound signal from the microphone, tape, and CD, and output it to the sound equipment such as headphones, speakers, amplifiers, and recorders, or make the musical instrument sound beautifully through the digital interface of music equipment (MIDI).
compose
Sound card is the microphone or linear input sound signal through the analog\/digital conversion programming digital audio signal for data processing, and then through the digital\/analog conversion into analog signals, sent to the mixer to amplify, and finally output to drive the speaker sound. The following is an introduction to the various components of the sound card.
1, digital signal processing chip
Digital signal processing chips can perform various signal recording and playback tasks, and can also perform many processing tasks, such as audio compression and decompression operations, changing sampling frequencies, interpreting MIDI instructions or symbols, and controlling and coordinating direct memory access (DMA) work.
2, A\/D and D\/A converter
The sound originally appeared as an analog waveform and had to be converted to digital form before it could be used in a computer. To achieve this conversion, sound cards contain A\/D converters that convert analog signals into digital signals so that data can be stored on disk.
In order to send the sound output signal to the speaker or other devices for broadcast, the sound card must use A D\/A converter to convert the sound represented in digital form in the computer into an analog signal for broadcast.
3, bus interface chip
The bus interface chip transfers commands and data between the sound card and the system bus.
4. Music synthesizer
A music synthesizer is responsible for synthesizing digital audio waveform data or MIDI messages into sound \/
5. The mixer
Mixers can mix sound signals from different channels, such as microphone or line input and CD input. In addition, the mixer also provides users with the ability to control the volume with software.