There are three common methods of noise reduction now:
1. Operation method of noise gate noise reduction method: Set a threshold, for example, the maximum peak value of noise is -65db, then set it to a threshold value. Signals below this value are directly reset to zero, and signals greater than this value do not change In this way, the noise can be eliminated. This method is the same as the manual noise removal method.
Advantages: It can eliminate the noise except the signal larger than this value.
Disadvantages: In all music with a signal greater than this value, noise is still retained and cannot be removed.
Representative software: SoundForge 2. Sampling and noise reduction method of operation: collect a noise sample, the requirement is relatively simple noise, and then use this sample as a basis to eliminate noise in music.
Advantages: You can clean the noise in the music relatively cleanly, which is beyond the power of the noise gate noise reduction method.
Disadvantages: while eliminating noise, it will affect the same frequency in the music, and at the same time have a certain sense of distortion.
Representative software: Samplitude2496, CoOLEDitpro Three, filter noise reduction method of operation: First of all, we must clearly know which frequency band the noise in the music is, and then use EQ, FFT and other similar effects or effect plug-ins to attenuate the signal in this frequency band. To achieve the noise reduction effect.
Advantages: Can effectively reduce noise. Disadvantages: It has an effect on the same frequency of music.
Representative software: very much.
In summary, the existing major noise reduction methods have their own advantages and disadvantages. The biggest disadvantage is the impact on the original sound quality, which is unbearable.
After a long time of thinking, ahTI finally found a way to effectively reduce noise while ensuring the original sound quality. This is the "Extender Noise Reduction Method".
What we usually use more is the compression effect. Its principle is: the signal above a certain signal value is compressed by a certain ratio to reduce the dynamics of the music. At the same time, you can choose to boost the smaller signal to make the dynamics smaller. The most used place is the dance music that we often hear now.
Simply put, the compressor is to push (small signal boost) down the large signal.
The effect of the expander is just the opposite, it is to boost the large signal.
The fuse that led me to use an expander to reduce noise was the singing recorded for them in the church of the choir of Qingdao St. Paul ’s Church yesterday.
Because there are more people on the scene and there is a certain amount of reverberation, the environmental noise is relatively large, but the piano and vocal signals are relatively small (of course, this small is still louder than the noise, otherwise, what else do I record, haha ​​...) How to reduce noise has become a big problem.
This morning I tried CooLEDitPro and Samplitude2496 to reduce the noise. The effect is not ideal, either the noise is not obvious, or the sound quality is seriously distorted.
After a few attempts, suddenly an idea emerged in my mind. If the noise is not moved, but only the singing signal is raised, can the noise be controlled within a certain range?
In SoundForgeV6.0, turn on the WavesC1 compressor (the other unnoticed feature is that it is also an expander, do you know?), And set the threshold to the peak of the noise, I chose -45db, put The compression ratio is set to 0.5 ~ 1 (the smaller the value, the greater the singing signal boost). At this time, the graphic display on the right has changed. Above -45db, the line is bent upward. After choosing an appropriate ratio, make sure to see what has changed in the waveform? Haha, success, the noise has not changed, the singing signal has improved!
note:
1. If the ratio is not set properly, clipping may occur. Just try the ratio a few more times.
2. If some noise is relatively large and the music signal is relatively large, you can do this process after lowering the overall volume. This can achieve the effect of reducing noise and maintaining the music signal.
3. There is a Makeup (signal compensation) in the WavesC1 compressor. If the value is increased, the noise will also increase. If you reduce its value, you can reduce noise.
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