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Old 09-13-2017, 05:11 AM   #17
alanofoz
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Join Date: Sep 2009
Location: Oz - Blue Mountains NSW, formerly Geelong
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Quote:
Originally Posted by ashcat_lt View Post
I found this, the bold parts are what led me to the conclusion that it's not a simple all-pass
No, I don't think it is a simple all-pass. The key word is adaptive. I think there might be a bit of sales-speak there too.

Yeah, of course rotating all frequencies by 180 results in an inverted waveform. But what about 90 degrees? 120? etc.

Still looks & feels like an all-pass filter to me, sorry.

If you get a chance, have a look and play with the Graphic Phase Shifter in Adobe Audition - very instructive.

Quote:
Adaptive Phase Rotation
Continuously analyzes the audio selection and applies the time-variable phase rotation to both left and right channels, resulting in a symmetrical waveform with minimal signal peak levels.

Adaptive phase rotation is best used on vocal material, as it can occasionally yield pitch artifacts on musical material.

Rotation (deg)
Rotates the channel’s phase by the specified degree.

When a waveform’s phase is rotated, every frequency is rotated equally. Rotating phase by 180 degrees inverts the waveform.
Was this from the iZotope web site? Haven't had time to look.
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alanofoz, aka Alan of Australia
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