Interpolate In Izotope Rx
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Spectral repair is a tool for interpolating selected areas on a time-frequency spectrogram. It is able to provide higher quality than the Declicker tool for long corrupted segments of audio (above 10 ms).
Spectral repair can be used to remove (or attenuate) certain unwanted sounds from recordings, such as squeaky chairs, coughs, dropped objects, mobile phones ringing, etc. It can also close up gaps in audio by using advanced resynthesis techniques.
- Interpolate is used for repairing individual clicks, below 4000 samples in length. This mode replaces your whole selection with the replacement signal. It can be used.
- The Interpolate module in iZotope RX 7 is used for repairing individual audio clicks, below 4000 samples in length. This mode replaces your whole selection with the replacement signal. It can be used instead of the “pencil” tool found in other software.
- May 07, 2017 Open the audio file in the RX Audio Editor or send it from your DAW/NLE via RX Connect. Select the RF Hits that are not on top the dialogue. Click on Process menu and select Silence, or just press Shift+S to replace the RF Hits with silence. Select the entire audio region. Open the Ambience Match module.
- The Interpolate module is used for repairing individual clicks below 4000 samples in length. This module corrects clicks by synthesizing a replacement signal based on the content in your selection. It can be used as a substitute for the ‘pencil’ editing tool found in many audio editing applications.
- Nov 19, 2015 Quick Tip 103 - this AP quick tip discusses interpolation within APx500 measurement software. IZotope RX Loudness Control - Duration: 3:28. IZotope, Inc. Recommended for you.
Understanding Spectral Repair Modes
Spectral Repair has several tabs representing different modes of interpolation.
Attenuatemode 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, this mode 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.
Replacemode can be used to replace badly damaged sections (such as gaps) in tonal audio.
Patternmode is suitable for badly damaged audio with background noise or for audio with repeating parts. It searches surrounding areas for a similar piece of audio and blends it into the selection.
Partials+Noisemode is the advanced version of Replace mode. It restores harmonics of the audio more accurately with control over the Harmonic sensitivity parameter. This mode links detected harmonics by synthesizing them through the selection, and interpolates the rest of the signal using the Replace method.
Processing Limitations
Depending on the mode and settings, Spectral Repair will have varying limits to the amount of audio that can be processed in your selection.
Unlimited - Attenuate when in Vertical mode
10 seconds - Attenuate Horizontal or 2D, Replace modes;
4 seconds - Pattern, Partials+Noise modes.
Applying Spectral Repair
To start working with Spectral Repair, switch to the spectrogram view by dragging the waveform/spectrogram opacity slider to the right. Next, identify the unwanted event on a spectrogram and select it using a time-frequency selection tool (it is not necessary to select a surrounding region, select only the event you want to repair). You can audition this selected time-frequency tile by pressing the 'Play selection' button in the RX transport.
Note: Depending on the mode chosen, Spectral Repair
Note: 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. Also, you can use the Find Similar Event tool to save time when searching for and fixing many similar events in large files.
Once you've found the event(s) to repair, select the appropriate interpolation mode (tab). Sometimes it's worth trying several different methods or number of bands to achieve the desired result. 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.
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Common parameters for many methods include 'Surrounding region length' that determines how far around the selection will Spectral Repair look for a good signal. 'Before/after weighting' allows to use more information from either before or after the audio 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.
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See the Reference Guide for descriptions of Spectral Repair controls.
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Tips:
- Adjust the Makeup Gain. In redrawing the waveform, the De-clip process causes an increase in peak levels. The Makeup Gain control can be used to prevent the signal from clipping after processing. It is also useful for matching the level after processing to unprocessed audio outside of the selection. As an extra measure of protection, engaging the Post-Limiter option applies a true peak limiter after processing to prevent the processed signal from exceeding 0 dBFS.
- Adjust the quality. There are three quality modes in RX's De-clip module: Low, Medium, and High. The Low setting processes very quickly and was designed for times when the De-clip plug-in needs to be used as a real-time insert, and in many cases, you will find that the Low setting yields great results. The High setting processes more slowly but is capable of achieving better results and makes sense for rendered effects where latency and processing power is less of an issue.
- De-link the threshold controls. If the clipping occurs only on one side of the waveform, or is more serious on one side than the other, you can de-link the Threshold sliders by clicking on the small chain icon between the top and bottom sliders.
- Zoom on the Histogram. Clipping can still occur on tracks with a low amplitude, and it can be hard to set the threshold and visualize the clipping on the Histogram with these tracks. The small + and – buttons to the left of the Histogram are designed to help with this. Click on these to change the amplitude scale and set threshold values as low as –64.0 dB.
- Not for brickwall limited audio! The De-clip interpolation is designed to help with analog and digital clipping but not brickwall limited audio. You can identify brickwall limiting visually; it does not display as a perfectly squared off waveform in the same way as clipping.
- Still hearing distortion? Read more about using the De-clip, De-crackle, Deconstruct, and Spectral Repair tools to attack distortion problems in this recipe.