Declip repairs digital and analog clipping artifacts that result when A/D converters are pushed too hard or magnetic tape is over-saturated. Declip can be extremely useful for saving recordings that were made in a single pass, such as live concerts or interviews, and any audio that cannot be re-recorded.
Using the Histogram to set the Clipping Threshold
May 12, 2018 Clipping in dialogue recordings is often a consequence of a lack of headroom in the recording equipment. The De-clip module in iZotope’s RX audio repair software is designed to help repair analog and digital distortion by redrawing squared. Clip Gain is a non-destructive amplitude envelope drawn into the main display. It's intended for levelling inconsistent audio but can also be used for creative effects, too. Hit Ctrl/Cmd-G to reveal the white Clip Gain line in the middle of RX 4's editor, then click it to create a node that you can drag upwards for up to 36dB of gain, or down.
The histogram meter in the Declip module allows you to set the Clipping Threshold control by finding the audio level where the waveform's peaks are concentrated. This usually indicates at what level clipping is present in the file.
Setting the Clipping Threshold
Select a section of the recording where clipping is prominent, then click the Compute button. This will analyze the levels of the program material. If clipping is present in the selection, it will usually appear as a horizontal line in the histogram that extends all the way across the meter.
To set the module's threshold, move the red line in the histogram, or the Clipping Threshold slider, until the red line in the histogram is just below the line where clipping is concentrated.
Makeup Gain
Izotope Rx Remove Clip Gain Node Location
Start by setting make-up gain at around -6.0 dB. This control accommodates the increased peak levels caused by the declipping process. If you're removing clipping during a short selection of a file, you may want to set this control higher to prevent a noticeable volume drop in the program material during the declipped section.
Choosing a quality mode
There are three quality modes in RX's Declip: Low, Medium, and High. Low quality mode processes very quickly; High quality mode processes slowly but in some cases can achieve better results. In many cases you will find that 'Low' quality mode gives you great results. To save time, always start by previewing the Low quality modes first. You can also use the Compare Settings window to try multiple modes and preview the results.
Izotope Rx Remove Clip Gain Node Problems
Read more about Declip controls in the Reference Guide.
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