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User Reference:gNautilus

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Synopsis

The g.Nautilus is a biopotential amplifier with wireless transmission technology with either wet or dry electrodes. It reads in up to 32 signal channels and 8 trigger channels.

Location

http://www.bci2000.org/svn/trunk/src/core/SignalSource/gNautilus

Versioning

Author

Kristopher Kaleb Goering (kaleb.goering@gmail.com)

Version History

Version 1.0: July 2015

  • Supports a single g.Nautilus
  • Referencing by any channel
  • Supports filters

Source Code Revisions

  • Initial development: --
  • Tested under: --
  • Known to compile under: --
  • Broken since: N/A

Functional Description

The g.Nautilus is a wireless headset by g.tec, and is the first in their product line to use g.NEEDaccess exclusively for realtime access. This documentation explains the parameterization and specifics on how to set up the system.

NOTE: As of right now, g.Nautilus is only supported by Windows 7 and newer versions. g.Nautiulus can only be built using Visual Studio on Windows.

Ensure the device is charged and connected to the base station (refer to the included documentation for help with this). Start BCI2000 with the gNautilus source module.

Parameters

  • SourceCh represents the total number of channels to be logged from the source module.
  • SampleBlockSize should be set equal to the size of the sample block pulled from the device.
    • NOTE: 25 and up found to work best during testing for 250Hz
  • SampleRate determines the rate at which the device samples data.
    • NOTE: Only the following sample rates are currently supported by the API: 250Hz and 500Hz.
  • ChannelNames is a convenience parameter. Name channels here and they can be referenced by these names later.
  • SourceChOffset should be set to a list of "0"s -- one 0 for each channel as indicated by SourceCh, separated by spaces.
  • SourceChGain should be set to a list of "1"s -- one 0 for each channel as indicated by SourceCh, separated by spaces.
  • DeviceIDMaster is the serial number identifier of the master g.Nautilus device. This serial can be found on the physical device and is typically in a "NB-20XX.XX.XX" format. This parameter can also be set to "auto" if there is only one g.Nautilus device connected to the machine.
  • DeviceIDs is a list of device serials (typically in "NB-20XX.XX.XX" format) which corresponds to the devices to record channels from. One of these serials must be specified as the master device in the "DeviceIDMaster" parameter. This parameter can also be set to "auto" if there is only one g.Nautilus device connected to the machine.
    • NOTE: Device slaving is not yet supported by the module OR the g.HIamp C API. -- This parameter only exists for future compatibility.
  • RefChList is a list of channels which can act as "Reference" channels for each amp. If left blank, no channel will be used as a reference, and the raw signal will be recorded in the output.
    • NOTE: If specifying reference channels, there must be one reference channel per device specified in "DeviceIDs" in the same order.
  • SourceChList
  • FilterEnabled
  • FilterHighPass
  • FilterLowPass
  • FilterModelOrder
  • FilterType
  • NotchEnabled
  • NotchHighPass
  • NotchLowPass
  • NotchModelOrder
  • NotchType
  • SourceBufferSize
  • EnableAccelerationData is a toggle button to enable acceleration data and store them in synchronous states AccelerationX1, AcceleratioY1, and AccelerationZ1.
    • NOTE To record acceleration data, at least one analog channel must also be recorded.
  • EnableCounterInput is a toggle button to enable the counter data and store it in the synchronous state Counter1.
    • NOTE To record counter data, at least one analog channel must also be recorded.
  • EnableLinkQuality is a toggle button to enable the link quality data and store it in the synchronous state LinkQuality1.
    • NOTE To record link quality data, at least one analog channel must also be recorded.
  • EnableBatteryLevel is a toggle button to enable the battery level data and store it in the synchronous state Battery1.
    • NOTE To record battery level data, at least one analog channel must also be recorded.
  • EnableDigitalInputs is a toggle button to enable both digital input ports and store them in synchronous states DigitalInput1 - DigitalInput8.
    • NOTE To record digital input, at least one analog channel must also be recorded.
  • EnableValidationIndicator is a toggle button to enable validation data and store it in the synchronous state Validation1.
    • NOTE To record validation data, at least one analog channel must also be recorded.

Future Work

  • Autoconfiguration!
  • Parametrization of Sensitivity
  • Selective Channel Acquisition
  • Digital Input as States
  • Head Mounted Accelerometer input as States
  • Signal quality indicator states
  • Battery life check
  • BCI2000 Integrated impedance check mode

See also

User Reference:Filters, Contributions:ADCs

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