trainpoy.blogg.se - Audacity noise reduction

#Audacity noise reduction trial#

Reduce: Select this option to filter out the noise from the selection.

The default setting is setting is 3, settings lower than this tend to favor music and higher settings tend to favor spoken word. Any frequency smoothing you request is applied after time smoothing. Time smoothing is always applied by Noise Reduction (attack of 20 milliseconds and release of 100 milliseconds) but the settings are not configurable. The width (in Hertz) of a frequency band is dependent on the sampling frequency of the track. If you hear artifacts in the noise-reduced audio after setting Sensitivity as high as possible without eliminating desired audio, try setting Frequency Smoothing to a value between 1 and 6 bands. There is a chance that smoothing will make the desired audio less clear, so where your desired signal is strong and of wide frequency range and the noise is light, try leaving this control at 0 (off). This modifies the signal you were intending to keep, but if artifacts remain in the noise-reduced audio the smoothing can make those artifacts sound more acceptable.

Frequency Smoothing (bands): At values of 1 or higher, this control spreads the noise reduction into the specified number of neighboring bands.

Set this control to the lowest value that achieves effective noise removal without the introduction of artifacts. Lower values may result in the appearance of artifacts in the noise-reduced audio. Greater sensitivity means that more noise will be removed, possibly at the expense of removing some of the desired signal as well.

Sensitivity: Controls how much of the audio will be considered as noise, on a scale of 0 (off) to 24 (maximum).

Higher values than necessary may make the noise even quieter, but will result in damage to the audio that remains. Use the lowest value that reduces the noise to an acceptable level.

Noise Reduction (dB): Controls the amount of volume reduction to be applied to the identified noise.

Listening to the Residue (the sound that will be filtered out when you apply "Reduce") can also be useful in determining how much damage is being done to the desired (non-noise) sound.

#Audacity noise reduction trial#

This is often best done by trial and error, adjusting the sliders and using the Preview button to listen to a few seconds of audio after noise reduction. Select the entire region of waveform from which you want to reduce the noise, then set the Noise Reduction parameters.