This option doesn’t create any random dithering noise floor. 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. Truncation results in harmonic quantization distortion that adds overtones to the signal and distorts the timbre.

Suppress harmonics: If, for some reason, any dithering noise is undesirable, simple truncation remains the only choice. If such high peaks are undesirable, you can enable this option to effectively suppress the spurious peaks in the noise-shaped dither. 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. Limit noise peaks: Dither noise is random in nature and has a very low amplitude. dither noise) when the input signal is completely silent (0 bits of audio).

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).Īuto-blanking: Mutes dither output (i.e.

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.More noise shaping can cause slightly higher peaks in your signal, even at high bit depths.ĭither Amount: The dithering amount can be varied from None (noise shaping only) to High. You can control the aggressiveness of this shaping, ranging from None (no shaping, plain dither) through Ultra (roughly 14 dB of audible noise suppression). 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. Noise shaping: Sets the aggressiveness of dither noise shaping. New bit depth: This sets the target resolution (bit depth) of the audio file. The result is a more pleasing sound and smoother fades. MBIT+ uses psychoacoustic methods to distribute dithering noise into less audible ranges. 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. Dither also preserves more of the dynamic range of a signal when converting to a lower bit depth. Dithering is a necessary process when converting audio from a higher bit resolution to a lower bit resolution.ĭithering is used to tame the quantization distortion that happens when converting between bit depths due to requantization.

Izotope rx 6 standard user guide