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Concept of "inverse filtering" in HE AAC?

To: AUDITORY@xxxxxxxxxxxxxxx
Subject: Concept of "inverse filtering" in HE AAC?
From: Danijel Domazet <Danijel.Domazet@xxxxxxxxxxx>
Date: Tue, 7 Mar 2006 16:08:58 +0100
Delivery-date: Tue Mar 7 10:22:50 2006
Reply-to: Danijel Domazet <Danijel.Domazet@xxxxxxxxxxx>
Sender: AUDITORY Research in Auditory Perception <AUDITORY@xxxxxxxxxxxxxxx>

Hi,
Can someone please explain the concept of "inverse filtering" and how it
applies to SBR encoding used in HE AAC audio codec?

Why is it used?
How does it improve quality (does it?)?
How do we esitamate it's level (needed by sbr decoder)?

Any web links are also welcome.

Thanks,
Daniel

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