Removing Digital Clicks and Pops from Audio

Description:

Sync problems and ground loops between a computer and audio interface can create an audio track mired by digital clicks and pops. The De-click plug-in in iZotope’s RX audio noise reduction software can effortlessly remove digital errors like these and preserve an otherwise unusable audio track.

Sample:

Here is an example of a quiet, isolated jazz kick drum track where two digital clicks are easy to hear and see in the waveform.

Before RX:

After RX: 

file
file

Standalone Workflow

  1. Open an audio file in the RX Audio Editor or send it using RX Connect.

  2. Select the entire file and open the De-click module.

  3. Inside the De-click module, choose the preset Short digital clicks. This sets the algorithm to Single-band because the digital errors are very narrow, and we don't want the algorithm to inadvertently remove any of the attack or thump from the kick drum.

  4. Click Preview and see if the preset is removing the clicks adequately. If so, just click Process to render the repaired audio. If not, continue on with the following steps.

  5. Check the box marked Clicks Only to monitor just what the algorithm is removing.

  6. Adjust the Sensitivity setting until you begin to hear the sound of the instrument being affected and then back it off slightly.

  7. Uncheck the box marked Clicks Only.

  8. When you have a sound you like, click the Process button.

  9. If you can't remove all of the clicks adequately in one pass, try repeating the process using multiple passes of De-click.

     

Plug-in Workflow:

  1. Select the audio file in your audio or video workstation.

  2. Open RX De-click as an offline plug-in.

  3. Inside the De-click plug-in, choose the preset Short digital clicks. This sets the algorithm to Single-band because the digital errors are very narrow, and we don't want the algorithm to inadvertently remove any of the attack or thump from the kick drum.

  4. Click the Preview button and see if the preset is removing the clicks adequately. If so, just render the repaired audio. If not, continue on with the following steps.

  5. Check the box marked Clicks Only to monitor just what the De-click tool is removing.

  6. Adjust the Sensitivity setting until you begin to hear the sound of the instrument being affected and then back it off slightly.

  7. Uncheck the box marked Clicks Only and render the process.

  8. If you can't remove all of the clicks adequately in one pass, try repeating the process using multiple passes of De-click.

Tips: 

  • Normalize Before De-click. For an audio file that was recorded at a low level, you may want to raise the level of the file before trying to apply de-click so that the algorithm can identify the clicks and remove them accurately

  • Multiple Passes of De-click. Sometimes, two passes of De-click with lower sensitivity settings work better than one pass of De-click with high sensitivity settings.

  • For Substantial Clicks. If you’re still hearing one or two substantial clicks, you can try zooming in on the click and removing it with more aggressive settings, or if the click comes up between words or phrases, try cutting that section of audio out and adding fades to smooth the transitions.

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