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Article Preview - Izotope RX

Noise-reduction Software [Mac/PC]

Published in SOS July 2008

Reviews : Software


Izotope are the latest developers to release a suite of tools for tackling problem audio. As well as the usual noise-reduction algorithms, RX also includes clip reduction and an advanced 'spectral repair' module.
Mike Thornton
Following on from the likes of Waves, BIAS, Sonic Solutions and Wave Arts, Izotope have released a comprehensive suite of restoration software. RX contains five modules: Declipper, Declicker, Hum Removal, Denoiser and Spectral Repair. At launch it was a stand-alone product only, but Izotope have since released an update that brings these modules into digital audio workstations as plug-ins. Supported formats include RTAS/Audiosuite, VST, MAS, Audio Units and Direct X, so there won't be many host applications unable to open their doors to this restoration suite.
In Pro Tools, which I used for this review, you can set up the plug-ins in RTAS mode, copy the settings across to the Audiosuite version and render the files, so taking the load off the system and making the Session playable on other systems without the plug-in. For testing purposes, I used the same sample files that I used in my restoration shootouts from August 2005 () and November 2007 (). All tests are for one pass using one plug-in, taken to the point where artifacts just become audible.
The suite comes in two versions: RX and RX Advanced. The Advanced version offers advanced manual declicking and 'multi-resolution' declipping, 'multi-resolution' spectral repair modes, additional denoiser parameters and, in the stand-alone version only, a dithering control panel and a resampling control panel.
Denoiser
The broadband Denoiser module offers three quality settings, but the highest can't be used in real time.
The broadband Denoiser module offers three quality settings, but the highest can't be used in real time.
The Denoiser module follows the traditional learn-and-process model used by most denoising plug-ins. RX and RX Advanced offer three different algorithms. One works in real time, one can work in real time on some systems, and the third (C) is available only for off-line processing, but offers the highest quality of processing.
A wealth of additional parameters is available in the Advanced version of Denoiser.
A wealth of additional parameters is available in the Advanced version of Denoiser.
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Published in SOS July 2008
Thursday 20th November 2008
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