Difference between revisions of "AnyWave:ADES"
(→The marker file (.mrk)) |
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The first attribute is the label of the marker.<br/> | The first attribute is the label of the marker.<br/> | ||
The second attribute is the integer value associated with the marker. -1 means that there is no value.<br/> | The second attribute is the integer value associated with the marker. -1 means that there is no value.<br/> | ||
| − | The third | + | The third attribute is the position in seconds, from the begining of the data file.<br/> |
There is a optional fourth parameter: the duration in seconds.<br/> | There is a optional fourth parameter: the duration in seconds.<br/> | ||
The duration attribute is only necessary to define markers of type ''Selection'' in '''AnyWave'''. Those are markers which mark a segment of data.<br/> | The duration attribute is only necessary to define markers of type ''Selection'' in '''AnyWave'''. Those are markers which mark a segment of data.<br/> | ||
Revision as of 16:12, 18 February 2014
ADES stands for AnyWave DEScriptive format.
ADES format is composed of at least two files but a third file can be used for markers.
The most important file is the header file for which extension is .ades
Contents
The header file (.ades)
This is a text file using a very simple syntax. Let's have a look:
#ADES header file
samplingRate = 1000
numberOfSamples = 4000
A1 = EEG
A2 = EEG
A3 = EEG
Line 1 begins with # which is the starting character for comments. However the first list is mandatory and defines the header file as ADES header.</br>
The next line defines the sampling rate of the data. This parameter is mandatory and must be expressed in Hertz.
Third line defines the total number of samples per channel in the data file.
The following lines describe the channels present in the data file. In our example, there are 3 channels, A1, A2, A3.
The channels are defined to be EEG channels but could be defined as SEEG, MEG, EMG, ECG, or even Trigger.
It is also possible to omit the channel's type. AnyWave will consider channels as EEG by default in that case.
That's all for the header file, a very simple syntax.
The data file (.dat)
Data are stored in a binary file which name is exactly the same than the header file except the extension: .dat
Samples are stored as float, 32bits little endian. The channels are multiplexed.
The marker file (.mrk)
It is possible to have a third optional file describing markers in the data. This file is an AnyWave marker file. The name must be the same than the header file but with extension .mrk
This is a text file with a simple format:
// AnyWave Marker File
Start -1 0.957031
Section -1 0.960938 2
Marker1 -1 150.957
CRISE -1 213.023
Marker2 -1 300.957
Marker3 -1 450.957
Marker4 -1 578.707
? -1 600.957
END -1 621.582
The first line must be // AnyWave Marker File. AnyWave will then recognize the file as a marker file.
Next come the markers, one marker by line.
Attributes must be separated by tabulations.
The first attribute is the label of the marker.
The second attribute is the integer value associated with the marker. -1 means that there is no value.
The third attribute is the position in seconds, from the begining of the data file.
There is a optional fourth parameter: the duration in seconds.
The duration attribute is only necessary to define markers of type Selection in AnyWave. Those are markers which mark a segment of data.
In our example, we have a total of 9 markers. One of them is a Selection marker, called Section and has a duration of 2 seconds. The first marker is called Start and the last one is called END.
Depending on the acquisition system used to record data or if the file was exported by AnyWave, markers can have different labels.
Building your own ADES file
It is quite simple to build a ADES file from Matlab for example. Suppose you have data stored as a Matlab matrix, writing a Matlab function to export the data as ADES format is not very difficult.
