In the sound card effect debugging, noise reduction is a key step. The quality of the processing directly affects the final overall sound card effect. In daily life, noise reduction refers to the elimination of noise, but in audio production is similar. the concept of.
Common methods of noise removal include sampling denoising, noise gates, and so on. It is a method for professional audio processing software to effectively remove the continuous stable background noise. The principle of denoising is to sample the waveform samples of the noise, and then analyze the waveform of the entire material and sample noise samples to automatically remove the noise. The noise gate is a threshold that sets a level. Signal levels below this threshold are all filtered out, and signal levels above the threshold are all passed.
The two audio noise reduction methods have their own advantages and disadvantages. The former can completely remove the noise. The disadvantage is that it has a destructive effect on the original human voice quality, and the signal-to-noise ratio is more destructive. After this denoising, the sound of the metal is very strong. Therefore, this method is generally not recommended to denoise the singing voice. As far as possible, the previous recording control to a higher signal-to-noise ratio is the key to solving the problem. The latter can effectively remove the background noise of the singing interval and has no destructive effect on the original sound, but when the voice comes out, the noise gate is opened, and the noise signal follows, and the noise floor of the entire material cannot be removed.
In addition, in the process of sound card debugging, the spectrum is used to analyze the frequency band where the noise is located, and by adjusting the EQ, the signal level of the frequency band in which the noise floor is attenuated can also play the role of audio noise reduction. This signal to the original vocal frequency band is also attenuated, forming new problems, but also used less.
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