readme

matlab下实现

A. Schloegl, "EDF/GDF toolbox for the use with Matlab", University of Technology Graz, Ver 0.46, May 1999.

This toolbox contains routines for reading and writing Biosignal data in EDF/GDF format. 
EDF can store only integer16 numbers. Hence one must be careful storing Matlab floating point numbers in this format. 
GDF supports char, signed and unsigned int8, int16, int32, signed int64, float32, float64 and bitN data types. 


Available files:	
	gdfopen.m
	gdfclose.m
	gdfseek.m
	gdfrewind.m
	gdftell.m
	gdfread.m
	gdfwrite.m
        gdfcheck.m      
	gdf.zip		Win-zipped files
        gdf1.gdf        1 GDF test file, 8 channels having type int8, int16, int32, int64, float32, float64, bit12 and ubit1 (boolean)
			10 records with 1s duration, 256Hz sampling rate, Header length is 256+8*256 = 2304 bytes
			8*256=2048 samples per record, (1+2+4+8+4+8+3/2+1/8)*256=7328 bytes per record gives 75584 bytes total.
		
Please send your bug reports to
      
%	Version 0.46
%	12 May 1999
%	Copyright (c) 1997-1999 by Alois Schloegl
%	[e-mail]	

HISTORY:
12 May 1999 	gdfopen, gdftell, gdfseek: EDF.AS.startrec and EDF.AS.numrec included
27 Apr 1999 	gdfopen: made "reading the recording time" EDF.T0 more robust
	 	         EDF.ErrNo included defined: 0(no),1,2,4,8,16,32 (file open error)
26 Apr 1999 	gdfopen: Calculation of Cal etc. included again
1x Apr 1999 	gdfopen-read: call to gdfcheck removed
31 mar 1999	gdfopen-read, gdfread, modified (for octave-compatibility)
24 mar 1999	gdfopen EDF.NRec changed to int64, gdfclose EDF.NRec always stored correctly.
 4 feb 1999     gdfread, modified, optimization for speed or for memory possible.
18 jan 1998     gdfopen, Version check is stricter, gdfread2 startet.
 4 dec 1998     documentation modified, V0.40 
 2 dec 1998     gdfopen-w modified: writes left-justified nmbers in EDF-Header 
30 nov 1998	gdfopen modified: V0.32 produces "GDF 0.11"
		duration is stored as rational number (uint32) nominator and (uint32) denominator
		channel type signed and unsigned bit1,12,22 and 24 included. gdfcheck, gdfread, gdfwrite modified
27 nov 1998	bit1, bit12, ubit12, ubit1 data types included. 

26 nov 1998	Version # 0.31, status: preliminary release
		the GDF toolbox is able to read EDF and GDF and to write GDF. 
		Writing EDF should be possible,too. Accuracy cannot be garanteed, because of format definition.
25 nov 1998	gdfcheck included, 
		gdfopen, gdfwrite, gdfread  modified
23 nov 1998	Technical report on GDF
		The functions of the EDF toolbox were renamed from edf*.m to gdf*.m, 
		because the GDF specification violates the EDF specification.
		gdfopen, gdfread, gdfseek, gdftell, gdfwrite, gdfclose were implemented 
		to show the possibility and effort of a software implementation.
		edf2gdf demo for copying of EDF data. Generates first GDF file "gdf1.gdf"
20 nov 1998     PhysMin and -Max are double
		DateTime = YYYYMMDDHHmmss00
                Version  = 'GDF 0.10'
        ******* GDF introduced *******
 5 nov 1998	edfopen, openedf (and edfload) Y2K compatible until year 2090 
 5 nov 1998	edfy2kch, checks (and corrects) EDF_struct generated by versions earlier than V3.07 of EDFOPEN for millenium bug
19 nov 1998	edfopen EDF.CHANTYP detection 'R' for respiration included
13 nov 1998	edfopen modified
13 nov 1998	edf3doc.txt included; document on the EDF struct in Matlab
12 nov 1998	edfwrite removed, edftell included.     
12 nov 1998	edfopen modified, returns variable header, write-mode eliminated.
12 nov 1998	edfread became compatible to OCTAVE
	******* EDF3 toolbox now Y2K compatible until Year 2090 *******
12 oct 1998	edfopen, edfread, edfload: modified 
 5 oct 1998	NEW: edfload, EDF3 toolbox became Matlab4.x compatible
 3 oct 1998	edfread modified, Mode 2&3 and input argument STARTPOS included
 1 oct 1998     edfopen modified, EDF.sPhysMin and EDF.sPhysMax included 
23 sep 1998 	edfseek, edfopen and edfread modified
22 sep 1998	bug report from Oliver Filz
17 sep 1998 	edfrewind included
17 sep 1998	NEW: edfwrite included, edfopen modified for writing

Available files:	
	edfopen.m
	edfread.m
	edfseek.m
	edftell.m
	edfrewind.m
	edfclose.m
	README		This file
	edf.zip 	zipped version
   aug 1998     start to reorganize the EDF toolbox
                edfopen, edfread, edfclose, and edfseek.m were generated.
loadedf.m (Matlab4.x), openedf.m, readedf.m, and closedf.m as well as viewedf2.m were already useful.


ACKNOWLEDGEMENT:
This work was supported by the Biomed-2 Project-SIESTA BMH4-CT97-2040.
funded by the European Commission, DG XII