The analysis is as follows:
1. Loudness balance is to adjust the speaker effect through several options, such as bass, volume and balance.
2. The sound will increase after opening, but the sound quality will decrease. In addition, after playing the video, the video may get stuck, and the sound will play normally, so there is no need to check it. If it is checked, it will affect the sound system.
3. This logical condition is to control the output information of the sound card by controlling the current, which is essentially the same as the adjustment of the knob on the sound box.
Extended data
Function of sound card
1. Sound card is also called sound card (called sound card in Hong Kong and Taiwan): Sound card is the most basic part of multimedia technology, and it is a kind of hardware to realize the mutual conversion between sound waves and digital signals.
2. The basic function of sound card is to convert the original sound signals of microphone, magnetic tape and CD-ROM drive, and output them to headphones, speakers, power amplifiers, tape recorders and other audio devices, or make musical instruments make beautiful sounds through MIDI.
3. The sound card obtains the sound analog signal from the microphone, converts the sound amplitude signal into a series of digital signals through the analog-to-digital converter (ADC), and stores them in the computer. During playback, these digital signals are sent to a digital-to-analog converter (DAC), which is restored to an analog waveform at the same sampling speed, and then amplified and sent to a speaker to generate sound. This technique is called pulse code modulation (PCM).
Baidu Encyclopedia: Sound Card