Difference between revisions of "Files & Formats"
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= The '''.sdeeg''' SD card data = | = The '''.sdeeg''' SD card data = | ||
+ | This is another proprietary, binary data format. It can be opened with NIC Offline software. |
Revision as of 10:24, 12 October 2013
Neuroelectrics devices generate a series of files and formats. Proprietary ones are in bold:
- The .easy data format (ASCII, plain text) - The .info file (ASCII, plain text) - The .edf (EFF+) and ".nedf" data formats (binary) - The .stim file (ASCII, plain text) - The .sdeeg SD card data format (binary)
In general, time keeping is given with time stamps per sample in ms since Jan 1st 1970 (Unix time).
Stimulation generated files
Neuroelectrics stimulation StarStim class devices generate stimulation specific files as well as EEG data. Here we describe the former (for EEG see the EEG data section).
the .info file associated with a stimulation session
Here is an example of the ASCII data file associated to a stimulation session. The name of the file would be something like '20130220112635_Patient01.info:
StartDate (first EEG timestamp): 1361377909087 Device class: StarStim Device Mac: 00:07:80:58:9C:1A NIC version: v1.1.9 Firmware version: 699 Line filter status: OFF Additional channel status:OFF Number of records of Stimulation: 46 (1 second/record) Total number of channels: 8 Number of EEG channels: 6 Number of stimulation channels: 1 Stimulation sampling rate: 500 Samples/second Stimulation units: uA Ramp up duration (s): 15 Ramp down duration (s): 15 Shamp ramp duration (s): OFF Stimulation duration (s): 1200 Type of stimulation: tACS+ Stimulation parameters: Channel 1: Position: C3 Type: EEG Recording Channel 2: Position: C4 Type: Stimulation Anodal Amplitude (uA): 100 Offset (uA): 0 Frequency (Hz): 10 Channel 3: Position: Ch3 Type: EEG Recording Channel 4: Position: Ch4 Type: Return Percentage return: 100% Channel 5: Position: Ch5 Type: EEG Recording Channel 6: Position: Ch6 Type: EEG Recording Channel 7: Position: Ch7 Type: EEG Recording Channel 8: Position: Ch8 Type: EEG Recording Trigger information: Code Description 1 Subject moved 2 Eyes opened 3 Eyes closed 4 sleeping 5 EEG signals are noisy 6 7 8 9
the .stim file
This ASCII file contains a record of the currents at each electrode.
There is a row per time sample.
The last column contains the time stamps per sample in ms since Jan 1st 1970 (Unix time).
EEG data files and formats
the .info file associated with an EEG only session
Here is an example of what this plain text file contains. The name of the file would be something like '20131011141257_demo.info:
StartDate (first EEG timestamp): 1381493577260 Device class: Enobio20 Device MAC: 00:07:80:63:F0:CD NIC version: v1.2.9 Firmware version: 699 Line filter status: 60 Hz Additional channel status: OFF Total number of channels: 20 Number of EEG channels: 20 Number of records of EEG: 15381 Number of packets lost: 0(0.00%) EEG sampling rate: 500 Samples/second EEG units: nV EEG montage: Channel 1: P7 Channel 2: P4 Channel 3: Cz Channel 4: Pz Channel 5: P3 Channel 6: P8 Channel 7: O1 Channel 8: O2 Channel 9: T8 Channel 10: F8 Channel 11: C4 Channel 12: F4 Channel 13: Fp2 Channel 14: Fz Channel 15: C3 Channel 16: F3 Channel 17: Fp1 Channel 18: T7 Channel 19: F7 Channel 20: EXT Number of records of Accelerometer: 30 (1 second/record) Number of channels of Accelerometer: 3 Accelerometer sampling rate: 100 Samples/second Accelerometer units: mm/s^2 Trigger information: Code Description 1 EventA 2 EventB 3 Movement 4 Eyeblink 5 6 7 8 9
The .easy data format (ASCII)
ABOUT THE NE ASCII DATA FORMAT (July 2012): NE ASCII files contain one line per time sample. Each line contains first the EEG data (8 or 20 channels, depending on the device, with units in nV), followed by three acceleration channels (aX,aY,aZ in mm/s^2- millimeters per second squared), an *optional* external input channel, a trigger flag (int32) and, finally, a timestamp in Unix time (ms from Jan 1 1970): Ch1(nV) ... Ch8or20(nV) aX(mg) aY(mg) aZ(mg) AddSensor Flags(uint32) TimeStamp (ms) Therefore Enobio8/StarStim will have a minimum of 8+2 (10) columns, or 8+3=11 if no accelerometer or >= 8+4 (with accelerometer). In summary: Enobio8/20 10 Columns: no AddSensor, no accelerometer data: 11 Comumns: no accelerometer, but there is AddSensor 13 Columns: there is accelerometer, but no Addsensor 14 Comumns: there is accelerometer, AddSensor. Enobio 20 will have >= 22 and >=24 columns if acc. data present: 22 Columns: no AddSensor, no accelerometer 23 Comumns: no accelerometer, but there is AddSensor 25 Columns: there is accelerometer, no AddSensor 26 Comumns: there is accelerometer, AddSensor. Enobio 32 will have >=34 adn >=36 if acc data is present 34 Columns: no AddSensor, no accelerometer 35 Comumns: no accelerometer, but there is AddSensor 37 Columns: there is accelerometer, no AddSensor 38 Comumns: there is accelerometer, AddSensor.
The .edf (binary, EDF+) data format
This is the standard | EDF data format. Files in this format can be opened from EDF data readers.
The .nedf (binary) data format
This is Neuroelectrics proprietary data format. It is lossless (full 24 bit) binary. It can be opened by NIC Offline.
The .sdeeg SD card data
This is another proprietary, binary data format. It can be opened with NIC Offline software.