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iZotope MBIT+ Dither
From the Process menu, choose Bit Depth, and then choose iZotope MBIT+ Dither from the submenu to convert sound files to
different bit depths and apply dithering.
Tip:
Because the signal-to-noise ratio decreases when you decrease the bit depth of a file, you should maximize the volume of the sound
file using the Volume or Normalize functions before performing the conversion.
1.
From the Process menu, choose Bit Depth, and then choose iZotope MBIT+ Dither from the submenu. The iZotope MBIT+ Dither
dialog is displayed.
2.
Choose a setting from the Preset drop-down list, or adjust the controls as needed.
Item Description
Bit depth Choose the desired bit depth from the drop-down list.
Note:
Increasing a file's bit depth cannot improve the quality of the existing audio,
but does allow higher resolution for processing.
Dither mode Choose a setting from the drop-down to choose the type of dithering that will be
applied to mask quantization noise.
• Type 1 Uses a traditional rectangular probability distribution function.
• Type 2 Uses a traditional rectangular probability distribution function.
• MBIT+ Uses a proprietary algorithm to offer superior results for all types of source
material.
Noise shaping Choose a setting from the drop-down list to control the amount of noise shaping that
will be applied.
When Type 1 or Type 2 is selected in the Dither mode drop-down list, the following
settings are available:
• None No noise shaping is applied.
• Simple A high-pass filter is applied to the dither noise.
• Clear Aggressively moves dither noise toward the Nyquist frequency.
• Psych5 Uses a fifth-order filter to move dither noise away from audible frequency
bands.
• Psych9 Uses a ninth-order filter to move dither noise away from audible frequency
bands.
When MBIT+ is selected in the Dither mode drop-down list, you can choose a setting
from the Noise shaping drop-down list to control the amount of noise shaping
applied. Increased settings will provide more audible noise suppression at the
expense of a higher noise floor.
178 | CHAPTER 11