Noise Reduction is available in the Audio: Toolkit Pack.
Noise Reduction is a quick way to clean up audio which is suffering from unwanted background noise.
After applying the effect, move the playhead to a frame containing the noise you wish to remove, and no other audio. This should be a frame where there is no other interfering noises. For this reason when recording audio it is always worth recording a section of ‘clean’ audio before recording your actual subject. Clicking the Capture Noise Print button samples the audio contained in frame, so that HitFilm can recognize the noise.
- Capture Noise Print: Clicking this button records whatever audio is present at the current playhead location. The effect will then use this Noise Print to remove the noise from all other frames of the video.
Once you have Captured a Noise Print, some additional controls will appear. In many cases the noise will be immediately removed. The controls also allow you to fine tune how the noise removal is handled.
- Reset Noise Print: Removes the noise print, so you can select a different frame.
- Add to Noise Print: Allows you to select additional frames of noise, and add them to the noise print.
- Threshold Level: On frames where the noise print overlaps with your dialog or other desired audio, removing all of the noise can sometimes create unnatural results. Reducing the Threshold Level restores a bit of the noise, and can be effective for getting a more natural result, while still retaining significant Noise Reduction.
- Reduce By: Defines, in dB, how much the noise print will be reduced in each frame of your video. If the results of the reduction are sounding unnatural, try lowering the Reduce By value, so the noise is not removed entirely.