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.

Use the links below to jump into the RX 7 Help Documentation: Introduction RX Overview Working with Files Recording Transport Controls Spectrogram/Waveform Display Interactive Tools Undo Histor. Hopefully this helps you understand why dither is so crucial to digital audio, how and why it works, and when it should be applied. Now, you’ll never have to dither about dithering again. If you’re reducing bit depth, whether from 64 or 32-bit floating-point to 24-bit fixed point, or from 24-bit down to any lower fixed-point value, add. IZotope RX 2 Advanced. In addition to the base version of RX 2, an extended application, iZotope RX 2 Advanced, offers even more precise control over RX 2 algorithms as well as including iZotope's critically acclaimed 64-bit SRC sample rate conversion and MBIT+ dither for professionals who want finer control over processing and delivery. The Dither module applies iZotope's MBIT+ dithering and noise shaping technology to maintain the highest audio quality possible when you are converting to 24, 20, 16, 12, or 8 bits. MBIT+ uses psychoacoustic methods to distribute dithering noise into less audible ranges. The result is a more pleasing sound and smoother fades.

Ozone 9 Dither The final stage of processing in any mastering session, proper dithering ensures no audible loss of quality when you convert to lower bitrates. For more information on dithering, please see our Mastering and Dithering guides.

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.

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.

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.

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Dither

Dither is a necessary process when converting from a higher bit resolution to a lower bit resolution.

Dithering is used to tame the quantization distortion that happens when converting between bit depths due to requantization. Dither also preserves more of the dynamic range of a signal when converting to a lower bit depth.

The Dither module applies iZotope's MBIT+ dithering and noise shaping technology to maintain the highest audio quality possible when you are converting to 24, 20, 16, 12, or 8 bits.

MBIT+ uses psychoacoustic methods to distribute dithering noise into less audible ranges. The result is a more pleasing sound and smoother fades.

New bit depth

This sets the target resolution (bit depth) of the audio file.

Noise shaping

Chooses the aggressiveness of dither noise shaping.

It is possible to provide more effective and transparent dithering by shaping the dithered noise spectrum so less noise is in the audible range and more noise is in the inaudible range.

You can control the aggressiveness of this shaping, ranging from None (no shaping, plain dither) through Ultra (roughly 14 dB of audible noise suppression).

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More noise shaping can cause slightly higher peaks in your signal, even at high bit depths.

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Dither Amount

The dithering amount can be varied from None (noise shaping only) to High. In general, the Normal dither amount is a good choice.

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.

A dither amount setting of High with no noise shaping produces a standard TPDF dither: a common white noise generation method with a triangular distribution of amplitudes between −1 and +1 of the Least Significant Bit (LSB).

Auto-blanking

Mutes dither output (i.e. dither noise) when the input signal is completely silent (0 bits of audio).

Limit noise peaks

Dither noise is random in nature and has a very low amplitude. However, after noise shaping, especially in aggressive dithering modes like Ultra, the high-frequency dither noise is significantly amplified, and the overall dither signal can show spurious peaks up to −60 dBFS during 16-bit quantization. If such high peaks are undesirable, you can enable this option to effectively suppress the spurious peaks in the noise-shaped dither.

Suppress harmonics

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.

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