Subject: Concept of "inverse filtering" in HE AAC? From: Danijel Domazet <Danijel.Domazet@xxxxxxxx> Date: Tue, 7 Mar 2006 16:08:58 +0100This is a multi-part message in MIME format. ------=_NextPart_000_0023_01C64201.7108A3F0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable 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 ------=_NextPart_000_0023_01C64201.7108A3F0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=3DContent-Type content=3D"text/html; = charset=3Diso-8859-1"> <META content=3D"MSHTML 6.00.2800.1528" name=3DGENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=3D#c5dbbf> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV>Hi,<BR>Can someone please explain the concept of "inverse = filtering" and=20 how it<BR>applies to SBR encoding used in HE AAC audio codec?<BR><BR>Why = is it=20 used?<BR>How does it improve quality (does it?)?<BR>How do we esitamate = it's=20 level (needed by sbr decoder)?<BR><BR>Any web links are also=20 welcome.<BR><BR>Thanks,<BR>Daniel<BR></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV></BODY></HTML> ------=_NextPart_000_0023_01C64201.7108A3F0--