Izotope Rx 5 Spectral Repair Tutorial
Learn how Repair Assistant in RX 7 can help you quickly clean dialogue, remove noise, and solve your most common audio problems. Stratus 3D, Symphony 3D, Insight 2, RX Loudness Control, 250 sound effects from Pro Sound Effects, and Groove3 video tutorials. Add to Cart Review specs and system requirements for RX 7. About iZotope. I guess it’s similar to the spectral features in iZotope’s Iris but even playing around a bit more with this technique, I was able to highlight some pretty bizarre and weird sections of the movie’s production audio to give me some really unique sounds for my library. Mike - You are so right about using RX. Spectral Repair STD & ADV Overview. Spectral Repair intelligently removes undesired sounds from a file with natural-sounding results. This tool treats selections within the spectrogram/waveform display as corrupted audio that will be repaired using information from outside of the selection. IZotope's RX 5 Audio Editor is in a class by itself when it comes to repairing, restoring, and enhancing audio. Likewise, Mike Thornton, Aka MR. Rx It, offers you the most comprehensive video tutorial series available, covering both RX 5 and RX 5 Advanced with a fine toothed comb filter, leaving no aspect of the software unexplored.
Here is our very own “Mr RX It” showing in another free video tutorial, courtesy of iZotope, how to use the iZotope RX3 Spectral Repair plug-in in Pro Tools.
In self shot documentaries the sound is often the thing that suffers, as the crew have too many other things to think about. In this example we suspect that the camera operator just didn’t hear the siren in the background on the best take so we are left to fix it in post.
See how Mike was able to improve it using the RX3 Spectral Repair plug-in without having to leave Pro Tools so speeding up the workflow.
RX3 and RX3 Advanced are on special offer until 1st May 2014. Check out the offers available from our friends at Time+Space or you can buy direct from iZotope.
Overview
Spectral Repair intelligently removes undesired sounds from a file with natural-sounding results.
This tool treats selections within the spectrogram/waveform display as corrupted audio that will be repaired using information from outside of the selection.
Select the noise you want to repair and Spectral Repair will reduce it to the level of the noise floor, replace it with audio from around the selection, or generate entirely new audio to fit the selection.
Attenuate
This mode removes sounds by comparing what’s inside a selection to what’s outside of it.
Attenuate reduces spectrogram magnitudes in the selected area to match magnitudes from the surrounding area, resulting in the removal of the sound without leaving an audible gap behind.
Attenuate does not resynthesize any audio. It modifies dissimilar audio in your selection to be more similar to the surrounding audio.
Attenuate is suitable for recordings with background noise or where noise is the essential part of music (drums, percussion) and should be accurately preserved. It’s also good when unwanted events are not obscuring the desired signal completely.
For example, Attenuate can be used to bring noises like door slams or chair squeaks down to a level where they are inaudible and blend into background noise.
Attenuate: Controls
- BANDS: Selects the number of frequency bands used for interpolation.
- A higher number of bands can provide better frequency resolution, but also requires wider surrounding area to be analyzed for interpolation.
- A lower number of bands is ideal for processing short selections or transient signals.
- A higher number of bands can provide better frequency resolution, but also requires wider surrounding area to be analyzed for interpolation.
- SURROUNDING REGION LENGTH: Defines how much of the surrounding content will be used for interpolation.
- STRENGTH: Adjusts strength of attenuation.
- MULTI-RESOLUTION: The multi-resolution mode allows for better frequency resolution for the interpolation of low-frequency content and better time resolution for the interpolation of high-frequency content.
- BEFORE/AFTER WEIGHTING: Gives more weight to the surrounding audio before or after the selection.
- DIRECTION OF INTERPOLATION: Determines where the material used in the repair process is located in relation to the current selection.
- HORIZONTAL: Signal to the left and right of the current selection will be used for interpolation.
- VERTICAL: Signal above and below the current selection will be used for interpolation.
- 2D: Signal above, below, to the left and to the right of the current selection will be used for interpolation.
Note: Direction Of Interpolation control availability
- Replace, Pattern and Partials + Noise tabs only utilize Horizontal mode and do not display this option.
- Replace, Pattern and Partials + Noise tabs only utilize Horizontal mode and do not display this option.
- HORIZONTAL: Signal to the left and right of the current selection will be used for interpolation.
Replace
The Replace tab can be used to replace badly damaged sections (such as gaps) in tonal audio. It completely replaces the selected content with audio interpolated from the surrounding data.
Replace: Controls
- BANDS: Selects the number of frequency bands used for interpolation.
- A higher number of bands can provide better frequency resolution, but also requires wider surrounding area to be analyzed for interpolation.
- A lower number of bands is ideal for processing short selections or transient signals.
- A higher number of bands can provide better frequency resolution, but also requires wider surrounding area to be analyzed for interpolation.
- SURROUNDING REGION LENGTH: Defines how much of the surrounding content will be used for interpolation.
- MULTI-RESOLUTION: The multi-resolution mode allows for better frequency resolution for the interpolation of low-frequency content and better time resolution for the interpolation of high-frequency content.
- BEFORE/AFTER WEIGHTING: Gives more weight to the surrounding audio before or after the selection.
Pattern
This mode finds the most similar portion of the surrounding audio and uses this to replace the corrupted audio.
Pattern mode is suitable for badly damaged audio with background noise or for audio with repeating parts.
Pattern: Controls
- BANDS: Selects the number of frequency bands used for interpolation.
- A higher number of bands can provide better frequency resolution, but also requires wider surrounding area to be analyzed for interpolation.
- A lower number of bands is ideal for processing short selections or transient signals.
- A higher number of bands can provide better frequency resolution, but also requires wider surrounding area to be analyzed for interpolation.
- SURROUNDING REGION LENGTH: Defines how much of the surrounding content will be used for interpolation.
- MULTI-RESOLUTION: The multi-resolution mode allows for better frequency resolution for the interpolation of low-frequency content and better time resolution for the interpolation of high-frequency content.
- PATTERN SEARCH RANGE: Selects the length of the audio segment used in a search for a suitable replacement interval. For example, setting it to 5 seconds will allow search within ±5 second range from the selection.
Partials + Noise
The advanced version of Replace mode. It restores harmonics of the audio more accurately with control over the Harmonic sensitivity parameter.
This mode allows for higher-quality interpolation by explicit location of signal harmonics from the 2 sides of the corrupted interval and linking them together by synthesis.
Partials + Noise is able to correctly interpolate cases of pitch modulation, including vibrato. The remaining of non-harmonic material (“residual”) is interpolated using Replace method.
Partials + Noise: Controls
- BANDS: Selects the number of frequency bands used for interpolation.
- A higher number of bands can provide better frequency resolution, but also requires wider surrounding area to be analyzed for interpolation.
- A lower number of bands is ideal for processing short selections or transient signals.
- A higher number of bands can provide better frequency resolution, but also requires wider surrounding area to be analyzed for interpolation.
- SURROUNDING REGION LENGTH: Defines how much of the surrounding content will be used for interpolation.
- HARMONIC SENSITIVITY: Adjusts amount of detected and linked harmonics.
- Lower values will detect fewer harmonics
- Higher values will detect more harmonics and can introduce some unnatural pitch modulations in the interpolated result.
- Lower values will detect fewer harmonics
- MULTI-RESOLUTION: The multi-resolution mode allows for better frequency resolution for the interpolation of low-frequency content and better time resolution for the interpolation of high-frequency content.
- BEFORE/AFTER WEIGHTING: Gives more weight to the surrounding audio before or after the selection.
Surrounding Region Display
- SURROUNDING REGION SHADING: When using the Spectral Repair module, your selections will be shown with a dotted line surrounding your selected region. This dotted line is directly controlled by the Surrounding Region and Before/After Weighting controls inside of your Spectral Repair modules, and provides a visual representation of your set values.
- The surrounding region is the region that RX uses for interpolation of the selected region. The data from the surrounding region is used to restore the selected region.
- The surrounding region is the region that RX uses for interpolation of the selected region. The data from the surrounding region is used to restore the selected region.
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Workflow
Applying Spectral Repair
- To start working with Spectral Repair, switch to the spectrogram view by dragging the spectrogram/waveform transparency balance slider to the right.
- Next, identify the unwanted event on a spectrogram and select it using a selection tool (use the time-frequency, brush, lasso or magic wand tools to fit your selection to the corrupted audio)
- You can audition just the signal in your selection by pressing the Play Selection button in the RX transport.
- Once you’ve found the event(s) to repair, select the appropriate Spectral Repair mode from the tabs at the top of the Spectral Repair settings window.
- You can use the Compare Settings functionality to audition the processing before applying it, or click the process to apply the active Spectral Repair tab’s settings.
More Information
This section contains useful information, examples and tips for getting the most out of the Spectral Repair module.
Visual Example
The following image shows the selection before processing on the top and the selection after processing with Spectral Repair on the bottom.
Processing Limitations
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Depending on the mode and settings, Spectral Repair will have varying limits to the amount of audio that can be processed in your selection.
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- Unlimited — Attenuate when in Vertical mode only.
- 10 seconds — Attenuate Horizontal or 2D; Replace modes.
- 4 seconds — Pattern, Partials + Noise modes.
- Longer selections will automatically adjust processing to use the correct mode.
Spectral Repair as an alternative to De-click processing
When used with a time selection, Spectral Repair is able to provide higher quality processing than De-click for long corrupted segments of audio (above 10 ms).
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Example use cases for Spectral Repair
When used with a time/frequency, lasso, brush, or wand selection, it can be used to remove (or attenuate) unwanted sounds from recordings, such as: squeaky chairs, coughs, wheezes, burps, whistles, dropped objects, mic stand bumps, clattering dishes, mobile phones ringing, metronomes, click tracks, door slams, sniffles, laughter, background chitchat, digital artifacts from bad hardware, dropouts from broken audio cables, rustle sounds from microphone movements, fret and string noise from guitars, ringing tones from rooms or drum kits, squeaky wheels, dog barks, jingling change, or just about anything else you could imagine.
Spectral Repair can also effectively repair gaps or replace audio intelligently by using advanced resynthesis techniques.
Increase efficiency with the Find Similar Event Tool
Some unwanted events consist of several separate regions on a spectrogram.
In some cases, it’s possible to achieve more accurate results by repairing several smaller selections one by one, instead of one large selection.
You can use the Find Similar Event tool to save time when searching for and fixing many similar events in large files.
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Use the Compare Settings window to experiment with Spectral Repair processing
Sometimes it’s worth trying several different methods or number of bands to achieve the desired result. A higher number of bands doesn’t necessarily mean higher quality! We encourage you to use the Compare Settings window to experiment and find the best settings for the project at hand.
Adjust Surrounding Region Length and Before/after weighting to perfect your processing
Common parameters for many modes include Surrounding region length which determines how far around the selection Spectral Repair will look for a good signal. Before/after weighting allows you to use more information from either before or after the selection for interpolation. For example, if your unwanted event is just before a transient (such as a drum hit) in the audio, you may want to set this parameter to use more of the audio before the selection to prevent smearing of the transient into the selection.