Re: Update on GDF 2.0

From: Alois Schloegl <a.schloegl ***AT***ieee.org>
Date: Sat, 29 Oct 2005 21:27:06 +0200
Subject: Re: Update on GDF 2.0
Newsgroups: tu-graz.biosig
Organization: University of Technology Graz
Message-id: <pan.2005.10.29.19.27.02.678087@ieee.org>
User-agent: Pan/0.14.2.91 (As She Crawled Across the Table (Debian GNU/Linux))
References: <df3qp2$pl$1@fstgss00.tu-graz.ac.at>


Based on a suggestion, the physical dimension will be encoded as binary
code. The textual description can be avoided, and a more compressed
encoding can be used. 

A suggestions for including this idea in GDF 2.0 is described in the
latest version of the GDF2.0pre available at
http://bci.tugraz.at/~schloegl/biosig/GDF2.0/

The feasibility of this encoding has also been tested, through the
implementation in BioSig4OctMat (v 1.65) and BioSig4C++ (v 0.21). 

The encoding scheme of the File Exchange format (FEF) for vital signs will
be used. The encoding consists of 16 bits; the 5 LSB encode the decimal
factors, the remaining bits encode the units. 

The code tables are available in BioSig4OctMat Version 1.65 or higher
within the files 
biosig/doc/units.cvs and
biosig/doc/DecimalFactors.txt

The tables are also accessible through the CVS-Web interface. 
http://cvs.sourceforge.net/viewcvs.py/biosig/biosig/doc/DecimalFactors.txt?view=markup
http://cvs.sourceforge.net/viewcvs.py/biosig/biosig/doc/units.csv?view=markup




  Alois