Fixing Wireless Dropouts in Production Audio

RF Hits (dropouts in the signal from a wireless mic) are a common issue in production dialogue. Using the Ambience Match and Spectral Repair modules in iZotope’s RX audio repair software, you can fix some of these issues, even if they’re right on top of the dialogue track.

Sample:

Here is an example of dialogue track with multiple RF dropouts.

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    Fixing RF Hits adjacent to the dialogue

  1. Open the audio file in the RX Audio Editor or send it from your DAW/NLE via RX Connect.
  2. Select the RF Hits that are not on top the dialogue.

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  3. Click on Process menu and select Silence, or just press [Shift+S] to replace the RF Hits with silence.

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  4. Select the entire audio region.

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  5. Open the Ambience Match module.

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  6. Press Learn and RX will automatically create a profile of the source audio’s ambience.

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  7. Click Preview and dial in the desired level of synthesized ambience in the gaps using the Trim fader. For this example, we’ll use a setting of +6 dB.

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  8. Click Process replace these gaps.

 

Fixing RF Hits on top of the dialogue

  1. Select an RF Hit that is located on top of dialogue.

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  2. Open Spectral Repair and click on the Replace tab.
  3. Start with the Bands control set to 1024, but adjust this parameter to your program material.

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  4. Set the Surrounding Region Length and Before/After Weighting controls to capture just the word surrounding the RF hit so that the replace algorithm synthesizes sound based solely on this.

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  5. Click Compare and audition the results. Make adjustments as necessary
  6. Once you've arrived at your desired result, click Process to complete the repair.

Tips: 

  • Alternate takes. Before committing time to make fixes, listen to alternative takes, other actor’s lavs, or the boom mic to see if you have usable audio from another source.
  • Fix it at the mic. Make sure that the sound recordist is attentively monitoring the recordings on-set to ensure RF issues are mitigated ASAP and not left to post-production.
  • Partials & Noise. Spectral Repair also includes a Partials & Noise mode, an advanced version of the Replace mode which can restore harmonic content more precisely by adjusting the Harmonic Content Sensitivity control to the program material. Lower values will detect fewer harmonics, while higher values will detect more harmonics and can introduce some unnatural pitch modulations in the interpolated result.
  • Multi-Resolution (ADV). The Multi-Resolution check box inside the Replace & Attenuate tabs gives the algorithm more information to synthesize from. The Multi-Resolution mode enables better frequency resolution for interpolation of low-frequency content and better time resolution for interpolation of high-frequency content. Sometimes turning Multi-Resolution on or off can also yield better results, but it depends entirely on the program material.

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