Izotope Rx Dither
RX 6 Overview. IZotope’s award-winning RX 6 Audio Editor is the industry standard for audio repair, restoration, and enhancement. It offers a comprehensive suite of tools focused on alleviating common to complex audio issues. . Includes iZotope MBIT+ Dither for exceptionally transparent conversion to different bit depths. Unique set of bit scopes and DC level meters provides a complete view of the digital bitstream and conversion process. Note: Dither is independent of the Maximizer. To turn dithering on and off, change the Dither type. Aug 26, 2010 I'm using Izotope RX to resample, and I've realized that after resampling the program turns the audio into a 32-bit float file, and then when I save it turns it back into a 24 bit file. Is this causing 'truncation' and should I be dithering? Where do i download old versions of virtual dj.
This week I've been remixing some stuff previously recorded at 48k, upsampling the tracks to 96k because I like the sound of the plugins at the higher rate.
I'm using Izotope RX to resample, and I've realized that after resampling the program turns the audio into a 32-bit float file, and then when I save it turns it back into a 24 bit file. Is this causing 'truncation' and should I be dithering? (I've noticed it has the option for dithering when saving after resampling, but at first I didn't think to use it because I didn't realize I was changing bit depth.)
I've been reading other threads on the 32-bit-to-24-bit issue, but nothing in regard to this specific process. I'm just trying to understand the math at hand as it would pertain to this particular application.
The Dither module applies iZotope's MBIT+ dithering technology to improve the quality of your audio files when you are converting to 24, 20, 16, 12, or 8 bits.
New bit depth - This sets the target resolution (bit depth) of the audio file.
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Noise shaping - By shaping the dither noise, it is possible to provide more effective and transparent dithering by shaping the dithered noise spectrum. You can control the aggressiveness of this shaping, ranging from None (no shaping) through Ultra (roughly 14 dB of audible noise suppression)
Dither Amount - The dithering amount can be varied from None (noise shaping only) to High. No dithering or Low dither amount can leave some non-linear quantization distortion or dither noise modulation, while higher settings completely eliminate the non-linear distortion at the expense of a slightly increased noise floor. In general, the Normal dither amount is a good choice.
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Auto-blanking - This option instructs RX to completely mute dither output (i.e. dither noise) when the input signal is completely silent (0 bits of audio).
Limiting of noise peaks - Dither noise is random in nature and has a very low amplitude. However, after noise shaping, especially in aggressive dithering modes, the high-frequency dither noise is significantly amplified, and the overall dither signal can show spurious peaks up to -60 dBfs. If such high peaks are undesirable, you can enable this option to effectively suppress the spurious peaks in the noise-shaped dither.
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Harmonics suppression - If, for some reason, any dithering noise is undesirable, simple truncation remains the only choice. Truncation results in harmonic quantization distortion that adds overtones to the signal and distorts the timbre. In this case you can enable Suppress Harmonics option to slightly alter the truncation rules, moving the harmonic quantization distortion away from overtones of audible frequencies. This option doesn't create any random dithering noise floor. Instead it works more like truncation, but with better tonal quality in the resulting signal. This option is applicable only in the modes without dithering noise and without aggressive noise shaping.