Yes, the following psychoacoustic and quantization treat different subband differently. But they just use scalefactor subband, not the same subband of polyphase filterband. It seems that the output of polyphase filter is transformed by MDCT and re-divided according to scalefactor subband and all the following modules use scalefactor subband only. So I wonder why we divide the signal equally at the begginning, just to convenient MDCT?
------- Original Message ------- Sender : Kun Niu<[EMAIL PROTECTED]> Date : Apr 11, 2006 23:50 Title : Re: [mp3encoder] Question about Subband filtering And another point. For different subband, we'll treat different subband differently, so a filter bank in advance can help us achieve this. This may also result in different encoder. Should be more apperent if we have another mp3 encoder source. 2006/4/11, [EMAIL PROTECTED] < [EMAIL PROTECTED]>: > > Send mp3encoder mailing list submissions to > mp3encoder@minnie.tuhs.org > > To subscribe or unsubscribe via the World Wide Web, visit > http://minnie.tuhs.org/mailman/listinfo/mp3encoder > or, via email, send a message with subject or body 'help' to > [EMAIL PROTECTED] > > You can reach the person managing the list at > [EMAIL PROTECTED] > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of mp3encoder digest..." > > > Today's Topics: > > 1. Question about Subband filtering (YUE LI) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Mon, 10 Apr 2006 06:51:46 +0000 (GMT) > From: YUE LI <[EMAIL PROTECTED]> > Subject: [mp3encoder] Question about Subband filtering > To: mp3encoder@minnie.tuhs.org > Message-ID: <[EMAIL PROTECTED]> > Content-Type: text/plain; charset=gb2312 > > Hi, > > I have a very simple question. But I just couldn't make it out. > > As I know, both psychoacoustic model and quantization use scalefactor > bands, not equally divided subbands. > > So why Polyphase subband filtering is performed in the beginning of > encoding? > > Looking forward to your help... > > Thanks & Regards > Yue > > ------------------------------ > > _______________________________________________ > mp3encoder mailing list > mp3encoder@minnie.tuhs.org > http://minnie.tuhs.org/mailman/listinfo/mp3encoder > > End of mp3encoder Digest, Vol 33, Issue 3 > ***************************************** > _______________________________________________ mp3encoder mailing list mp3encoder@minnie.tuhs.org http://minnie.tuhs.org/mailman/listinfo/mp3encoder _______________________________________________ mp3encoder mailing list mp3encoder@minnie.tuhs.org http://minnie.tuhs.org/mailman/listinfo/mp3encoder
