Getting A Crackle When Using Izotope Rx

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Apr 09, 2019 If you have trouble determining what kinds of noise are in a recording, or simply want to save time tracking noises down, we recommend using Repair Assistant in RX 7. It will scan a recording and suggest repairs to benefit audio quality. Watch this feature in action here or learn how to spot audio issues by eye in the RX spectrogram here. In iZotope RX, the manual way of click repair is available through the Interpolate module. The user selects the range of samples corrupted by a click, and the interpolation algorithm replaces the selection with the synthesized signal. Some users have reported that using De-crackle after Mouth De-click produces improved results on certain.

Declick

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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.

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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.

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.

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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.

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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.

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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.

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