This page contains reference information about this module. For more information on how to use Declicker see the Users Guide.
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- Declick/Decrackle features both Manual and Automatic modes. Automatic mode can look at a whole file, or a selection, and detect and remove clicks and pops. For audio files that have clicks/pops or crackle throughout the file, Automatic mode is the best choice as it will save you a lot of time.
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Declicker repairs clicks, pops and other impulse noises in the audio waveform.It has two modes: Manual and Automatic. In Manual mode, the user selects a distorted click on a waveform (typically, very short: below 10 ms), and uses Apply button to interpolate a single selected click. In Automatic mode, the program automatically detects and interpolates clicks in a long selection.
Automatic Mode Controls:
Quality - controls the interpolation processing quality.
Sensitivity - controls the amount of clicks that are detected and repaired. Low values of this parameter will remove fewer clicks, while higher values can repair too many intervals which can result in distortion.
Maximum click width - selects the maximum expected duration of a single click in milliseconds - Low values of this parameter will optimally find only short clicks. Too high values of this parameter may cause lower reliability and precision of detection. If the clicks in the recording are of diverse durations, we recommended starting with removing shortest clicks and then proceed with removal of longer clicks.
Output clicks only - outputs the difference between the original and processed signals (suppressed clicks)
Manual Mode - Simple:
Interpolation order - selects the number of surrounding samples that are directly used to produce the interpolated samples. Typically higher order can represent more signal harmonics in the interpolated region resulting in better quality, but sometimes high-order interpolation can produce pops when used on very simple or noise-only signals.
Manual Mode -Advanced Controls: (Advanced Only)
Number of iterations - affects quality of results. Usually higher number of iterations produces smoother results.
Interpolation order - selects the number of surrounding samples that are directly used to produce the interpolated samples. Typically higher order can represent more signal harmonics in the interpolated region resulting in better quality, but sometimes high-order interpolation can produce pops when used on very simple or noise-only signals.
Autocorrelation length - selects the size of the surrounding region (in milliseconds) used for learning a signal model for interpolation.
Declick
Declick is useful for restoring for old vinyl and other phonograph recordings that are riddled with clicks, pops and crackles. Declick can also remove a variety of short impulse noises from other sources, including some clicks caused by digital errors.
Decrackle
Typically, the duration of a single click and pop will not go beyond 10 ms. Decrackle is designed to handle a more continuous stream of irregularities in your audio that become blended together at lower amplitude levels, resulting in what we hear as crackle.
TIP: Decrackle is not designed to be used instead of Declick. On the contrary, the best results can be had by first running the Declick module, and afterward, processing with Decrackle.
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Automatic or Interpolate Declick/Decrackle?
Declick/Decrackle features both Manual and Automatic modes. Automatic mode can look at a whole file, or a selection, and detect and remove clicks and pops. For audio files that have clicks/pops or crackle throughout the file, Automatic mode is the best choice as it will save you a lot of time. The Interpolate mode is useful when you want more precise control over repairing clicks, or in some cases where there are a few hard to fix clicks left over after running the Automatic mode. Interpolate processes must be performed on each event individually.
Automatic Declick/Decrackle Mode
Start by choosing the desired Algorithm type for your Declick module. Single-band mode works very well with narrow 'digital' clicks and has the advantage of having a much faster processing time. The Multiband options work well for wider vinyl clicks or thumps and perform great on very uneven audio material such as old recordings.
Before running the module in Declick/Decrackle automatic mode, it is a good idea to look at the Spectrogram display and visually identify clicks to inspect how wide they are, as this will help you see roughly what your Maximum Click Width and sensitivity should be set to.
Hit preview to hear the result of your settings, and as audio is playing back, fine tune the sensitivity and click width sliders to remove the most clicks and pops. The ideal setting should remove the most clicks without damaging transients in the program material. For example, drum hits may be mistaken for clicks at high Width and Sensitivity settings.
To better hear what is being removed, toggle the Output Clicks Only control during preview playback. This will let you hear what is being removed from the audio, allowing you to fine tune your settings.
Note: For material with crackle/clicks or pops of very different sizes and lengths, try running Declick/Decrackle in several passes.
Interpolate Mode
To locate clicks, display both waveform and spectrogram by dragging the waveform/spectrogram transparency slider to the center. Clicks will be visible as vertical lines on the spectrogram. To select a click precisely, zoom in and inspect the waveform. While spectrogram will help with finding clicks, the waveform display will help you accurately select click boundaries.
Select the click and press Apply. The click will be removed using interpolation from the surrounding audio data. If the result is not satisfactory, try adjusting Interpolation Order or other parameters. If the click or pop is very long, Interpolate may cause a short level drop. In this case, consider using the Spectral Repair tool instead of Declick/Decrackle.
Read more about Declick & Decrackle controls in the Reference Guide.