WAVE EDITOR / RECORDER

Noise Removal Tool

The Noise Removal Tool is built on iZotope RX technology and can independently remove background noise (tonal or broadband) from a sample, repair clipped samples and remove clicks from samples. Any or all these denoise functions can be performed in a single pass. The modules are activated by the button in front of each section label.

NOTE: The Denoiser, Declipper and Declicker have a button preceding the section titles, this activates the given function when selected. The Declipper and Declicker are deactivated in the screenshot above.

To Open the Noise Removal Tool

To open the Noise Removal Tool Left-click on the Clean up (denoise) button or use the Tools > Spectral > Clean up (denoise) option.

Residual vs Removed Sound

Above the main display window.

Sample Display

The main display window shows a spectral view of the sample to be processed. This represents frequency on the horizontal axis and time on the vertical axis, while color represents intensity.

EQ Envelope

The (white) EQ envelope allows a +12 to -24 dB EQ curve to be applied to the selected sample. Time is represented on the vertical axis and Frequency on the horizontal axis. Apply EQ in addition to the other noise reduction functions to fine-tune the result.

To edit the EQ curve: Right-click in the 'Envelope Editor Window' to add points, and Left-click to move points and tension markers. Right-click points to open a context menu that allows you to delete points or change the curve type. The default mid-line is 'no change'. Boost/Cut values appear in the FL Studio Hint Bar as the nodes are moved.

If you need a dedicated equalizer use the Equalize tool.

Denoiser

To activate ensure the Denoiser button is selected. The Denoiser is designed to reduce or remove constant background noises in recordings. This background noise can include tape hiss, microphone hum, power mains buzz, camera motor noise, air-conditioning rumble and any other type of noise that doesn't change in level or frequency significantly throughout the recording.

Using the Denoiser:

  1. Noise profile - The Denoiser needs to hear an example of the background noise, preferably in isolation from other sounds, so that it can generate an accurate 'noise profile'. From main Edison sample window, select a section of the sample that contains only noise (if possible). Examine the start and end of the sample, where noises are usually exposed. Alternatively, you may need to select regions in the sample where there are pauses in the desirable sound (breaks in speech or singing for example). If a 'noise-only' region can't be found, select a quiet section of the sample where the noise is at its most audible. After selecting the longest section of noise that you can find, Right-click the Clean up (denoise) button to create the noise profile. If the Noise Removal Tool is open, click the Acquire noise profile button to select the noise sample.
  2. Select the region to be processed - Prior to returning to the Denoiser interface, make sure that the region you want to denoise is selected in the main Edison sample window (the Denoiser will retain the noise profile so it is OK to close the Denoiser to select the region to be processed). If no region is selected the whole sample will be processed, this is usually the desired outcome as processing small sections of a sample can lead to audible tonal changes at the boundaries of the processed region.
  3. Preview the settings - Open the Denoiser Tool and preview the default settings by clicking on the Preview button. Note the noise profile will appear in the Denoiser as a green frequency curve (see the screenshot above).
  4. Fine tune the controls - Sometimes you may hear 'underwater' artifacts of the noise reduction process, if so you should continue to adjust first the Threshold and then the Amount settings. You should apply only enough reduction (Amount) to make the noise barely or not noticeable in the context for which the sound is to be used. Excessive amount settings are guaranteed to cause audible artifacts. It is often useful to select the Output noise only button to more clearly hear the parts of the sample being removed. Ideally only noise will be heard.
  5. Accept the result - Once you are satisfied with the settings.
  6. Practice makes perfect - If you would like to experiment, the sound 'Maximus NoiseGate Tutorial 44kHz.wav' is a vocal mixed with some power-supply hum, exposed at the end of the sample. To download the file you will need to create a logon at freesound. The freesound project is an initiative of the Music Technology Group of Pompeu Fabra University to build a library of Creative Commons licensed sounds.

Declipper

To activate ensure the Declipper button is selected. The Declipper can repair digital and analog clipping artifacts that result when A/D converters are overloaded or magnetic tape is over-saturated. The Declipper can be extremely useful for saving recordings that can't be re-recorded such as live concerts, interviews or one-off audio events.

NOTE: The Declipper re-creates peaks above the clipped level and will therefore reduce the overall volume of the recording to provide headroom for this process. In light of this, declipping usually needs to be applied to the entire recording in order to avoid a sudden drop in volume in the processed region.

Declicker

To activate ensure the Declicker button is selected. The Declicker is useful for restoring for old vinyl and other recordings that cause clicks, pops and/or crackles. The Declicker can also remove a variety of short noises from other sources, including some clicks caused by digital errors or electrical interference. The Declicker works best on click-transients of 10 ms or less.

Accept button

Plugin Credits

Interface: Didier Dambrin.