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Old 10-01-2012, 01:57 PM
iain_m iain_m is offline
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Question Reference guide wrong about 32-bit dithering?

Page 117 of the PT10 reference guide PDF (under the section, 'How the Save Copy In Command Works') seems to contain an error.

In the table that explains when dither and noise shaping are applied, it says that saving a copy of a 32-bit float session as another 32-bit float session applies both dither and noise shaping.

Surely PT doesn't apply either dither or noise shaping in that scenario, because bit depth isn't being changed, and there's no reason to dither 32-bit audio in any case...?
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Old 10-01-2012, 02:11 PM
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jasonthurley jasonthurley is offline
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Default Re: Reference guide wrong about 32-bit dithering?

I believe what that refers to is yes its a 32bit floating point engine... but dithers to your session setup setting (Like 16 or 24 bit)... that's where the dithering happens. 32 bit floating point has unlimited headroom but 16, 24, even non floating point 32 bit do not.

Avid might correct me if I am wrong or mistaken of the meaning....
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Old 10-01-2012, 03:10 PM
iain_m iain_m is offline
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Default Re: Reference guide wrong about 32-bit dithering?

Hi Jason,

Thanks but I don't think that interpretation applies here. The table is meant to show how PT formats audio files which are used in a session, when creating a copy of that session.

Since the destination bit depth of the copied session is the same, there should be no dithering. (This is the case when saving a 24-bit session as 24-bit, or 16-bit as 16-bit.)

I'm hoping it's just a typo and not that PT dithers the 32-bit float files.
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Old 10-01-2012, 03:17 PM
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Default Re: Reference guide wrong about 32-bit dithering?

Hmmm... good question... I would assume that would only mean dithering files that are not at the session settings.... might have to contact Avid for an explanation.
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Old 10-02-2012, 03:35 AM
demodigi demodigi is offline
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Default Re: Reference guide wrong about 32-bit dithering?

PT10 now supports new file formats AND is able to mix file formats (incl. interleaved files) in the same session (the format of a session is only for rendered and converted files).

So when you make a "save session copy as..", it will conform all your audio files to a unique resolution, and so, it needs to apply a dither.

What's new in Pro Tools 10 PDF (page 1)
New and Enhanced System Capabilities
• Support for 32-bit floating point audio files
• Support for mixed audio file formats
• Support for interleaved audio files
• Support for WAVE Extensible audio file for- mat
• Support for RF64 files
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