DeNoise Plus is a procedure for elimination of a broadband noise of known characteristics. Prior to using this function you have to "noiseprint" an audio file, i.e. to run a special noise identification function (NoisePrint) on a fragment of the recording that contains noise only - a short piece of "silence" preceeding or coming after the recorded signal can be used for this purpose. Alternatively, if the reference noise sample can't be indicated, you can try using a noiseprint extracted from another archive recording (preferably coming from the same source, e.g., from the same old record).
Even though DeNoise Plus was not designed to cope with impulsive disturbances, it is capable of reducing clicks (small clicks are completely eliminated in the process of removing wideband noise; the large ones are reduced in size).
In order to use DeNoise Plus proceed as follows:
1. Indicate the source soundfile by clicking the corresponding SOURCE
button.
2. Choose the DeNoise Plus command from the Restore menu.
3. Select a noiseprint that can be used in the course of signal renovation. If the NoisePrint command was used just prior to choosing DeNoise Plus, the last taken/inspected noiseprint will appear at the top of the DeNoise Plus dialog. To take a new noiseprint, modify spectral characteristics of an existing noiseprint or to change noiseprint to another (registered) one press the Select button to evoke the NoisePrint Manager dialog. When done, press the DeNoise Plus button to return to the DeNoise Plus dialog.
4. Adjust four renovation parameters (weight, smoothing range, frequency carving and frame size) and two dynamic noise reduction parameters (noise floor and adaptation rate). Select the range of processing (all, window, block).
5. If desired, change the name of the destination soundfile (for unregistered source soundfiles only).
6.Click the Process button to start processing.
For additional information, click the topics listed below