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From: physcrft@netcom.com (William R. Morrell)
Subject: Re: Subband Audio Coder
Message-ID: <physcrftCyC50v.1A7@netcom.com>
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Date: Thu, 27 Oct 1994 14:17:18 GMT
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Xref: glinda.oz.cs.cmu.edu comp.speech:3645 comp.dsp:14200

Akshaya Trivedi (trivedi@delhi.eedsp.gatech.edu) wrote:
: Hi there,
: I am doing a project on subband audio coding.  I have gone through a lot of 
: papers from IEEE Trans. on ASSP and also ICASSP.  The transaction papers 
: are mostly theory of new transforms etc. and conference papers mostly discuss
: results.  Has anyone done a similar project? If so, any feedback/info will be
: greatly appreciated.  I am thinking on the lines of using Malvar Lapped
: Transforms followed by DCT-iv etc.  
: Thanx,
: Akshaya

FWIW-

What you describe is very similar to ASPEC, the AT&T bid for psychoacoustic
audio coding.  The spec is available, although from where, I'm not sure.  It
was entered in the CCITT and MPEG competitions,  so perhaps these orgs
would have info...

MPEG layer 3 uses DCT's on the outputs of the usual MPEG filter banks to 
improve the spectral resolution beyond the usual 32 bands.  Dolby AC-2/3
also use high resolution spectral transfroms (again DCT's I think).  
Will

