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Revision as of 22:23, 22 November 2015 by Pbrunner (talk | contribs) (Valid Operating Modes)

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The Nihon Kohden JE-120A amplifier is a clinical monitoring system capable of acquiring EEG or ECoG signals from up to 256 channels. Paired with the QI-123A LAN converter box, this system can provide a research data stream in addition to the clinical data stream. The research data stream can be sampled at up to 2kHz for 256 channels, 5kHz for 128 channels or 10kHz for 64 channels.




Griffin Milsap ( Johns Hopkins University

Peter Brunner ( Wadsworth Center - National Center for Adaptive Neurotechnologies

Version History

Version 1.0: November 2015

  • #

Source Code Revisions

  • Initial development: 4913
  • Tested under: #
  • Known to compile under: 4913
  • Broken since: --

Functional Description



  • SourceCh total number of channels to be acquired from the source module or auto for all channels (256 channels)
  • SampleBlockSize number of samples acquired in each block or auto for default setting (1/10th of sampling rate)
  • SampleRate determines the rate at which the device samples data.
  • ChannelNames is a convenience parameter. Name channels here and they can be referenced by these names later.
  • SourceChOffset auto for default settings (0 for each channel).
  • SourceChGain auto for default settings (1 for each channel).
  • SourceChList list of channels that should be acquired or auto for all channels
  • SourceBufferSize

Valid Operating Modes

The NihonKohdenSource only accepts specific sampling rates. The number of channels acquire is limited at sampling rates of 5000 Hz and above. The following table shows all valid combinations of sample rate and maximum number of channels.

SamplingRate Max SourceCh Aliasing Filter Cut-Off
[samples/sec] [channels] [Hz]
100 256 30 or 35
200 256 60 or 70
500 256 120
1000 256 300
2000 256 600
5000 128 1200
10000 64 3000

Valid Operating Modes

State Variables

See also

User Reference:Filters, Contributions:ADCs