The “output signal-to-noise ratio” is an important factor in measuring the sound quality of a sound card. The concept is the ratio of the output signal voltage to the noise voltage output at the same time, in decibels. The larger the value, the smaller the noise incorporated into the signal at the output and the purer the sound quality. As the main output source of the computer, the sound card has a relatively high signal-to-noise ratio requirement. Since the sound is output through the sound card, a series of complicated processing is required, so there are many factors that determine the signal-to-noise ratio of a sound card. Since the electromagnetic interference inside the computer is very serious, the signal-to-noise ratio of the integrated sound card is difficult to be high, and the signal-to-noise ratio is generally about 80 dB. PCI sound cards generally have a high signal-to-noise ratio (most can easily reach 90dB), and some are up to 195dB or more. The higher signal-to-noise ratio ensures that the sound is softer when the sound is output, and the noise can be reduced to a minimum.
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