BrainAmp Signal Element

Modified on 2018/08/03 21:08 by Administrator — Categorized as: Elements, Signal Acquisition

Summary

Element Icon BrainAmp Signal
Info
Category: Signal Acquisition AddIn: Signal Processing
Creator: OkazoLab Scope: Experiment
Owns Snippets: None Usage: Snippets

Properties

NameDescription                              ConstraintsTypeOn
runtime
change
BrainAmp Settings
Data-block Length        Defines a length of the signal data-block (in ms) sent by the amplifier.        
Design Time..
        		Int32         
Use Auxiliary Box        Defines whether the Brain Amp auxiliary box is enabled. The option is relevant only for the EXG 16 models.        
Design Time..
        		Boolean         
Use Test Signal        Defines whether a test signal is sent by the amplifier instead of a real EEG signal        
Design Time..
        		Boolean         
DI Resistors        Value bits (0-15) defines states of the digital input resistors of the amplifier. Bit value 1 means pull-up, 0 means pull-down.        
Normal..
        		clBina..         
Signal Generator
Signal Source        Defines a source for the signal. The emulated rhythmes can be used for offline validation of the chosen analysis settings        
Design Time..
        		enEmul..         
Emulated Sampling Rate        Defines the emulation sampling rate (samples per second), when data is generated or streamed from a file.        
Design Time..
        		Double         
Primary Frequency        Defines the frequency of the primary rhythm in the generated signal, in Hz. Assign the zero to exclude the primary frequency from the generated signal.        
Design Time..
        		Double         
Secondary Frequency        Defines the frequency of the secondary rhythm in the generated signal, in Hz. The secondary frequency magnitude is a half of the primary frequency magnitude. Assign the zero to exclude the secondary frequency from the generated signal.        
Design Time..
        		Double         
Noise Level        Defines the noise level (in % to the norm magnitude of the primary frequency). The noise is added to the generated signal. Assign the zero the exclude the noise from the generated signal.        
Design Time..
        		Double         
External Datafile        Opens the dialog for selecting a data file containing a stream of double numbers representing a signal. If a file name without a path is defined, the data file will be picked up in the location of the experiment file.        
Design Time..
        		String         
Channel Configuration
Selected Channels        Defines what signal channels are selected for acquisition within EventIDE. Selected channels are registered in the EventIDE signal pool at runtime and become available for the signal analysis elements.        
Design Time..
        		IList         
Selected Channel Count        Indicates how many signal channels are currently selected for acquisition        
Status..
        		Int32         
Total Channel Count        Indicates how many signal channels are available for acquisition in the total        
Status..
        		Int32         
Buffer Size        Defines the size (in samples) of a circular buffer that stores incoming signal data.        
Design Time..
        		Int32         
Runtime Control
Reset Signals Now        Runtime commands that resets the signal buffers and data acquisition        
Runtime Command..
        		Boolean         
Control
Is Enabled        If set to false the element is completely omitted when the experiment is run        
Design Time..
        		Boolean         
Title        Title of the element        
Design Time..
        		String         

BrainAmp Signal Element allows a real-time signal acquisition with a family of the BrainAmp EEG amplifiers manufactured by Brain Products GmbH. The supported amplifiers include: BrainVision BrainAmp Standard, BrainAmp DC, BrainAmp MR, BrainAmp MR plus, BrainAmp ExG and BrainAmp ExG MR. To make the element working, you need the standard Brain AMP drivers installed on the same computer and operational amplifier connected either by USB or PCI card.


Description

The BrainAmp Signal element reads an EEG signal conveyed directly from a BrainAmp amplifier connected by USB or PCI card. As an experiment starts, the element begins receiving data and buffering samples into circular buffers, maintained by EventIDE (the buffers can collect data from multiple signal acquisition elements). The signal processing elements, e.g. Signal Analyzer element can be then used to monitor and analyze the buffered signals at runtime. Fast buffering and processing time in EventIDE (down to 1ms) allows instant detection of signal characteristics and, subsequently, various forms of signal-based feedback control in experiments.

Practical Use

  1. Make use that your amplifier is operational and connected to the EventIDE computer.
  2. Add a new BrainAmp Signal element to any event in your experiment (the element is global and works from the start to the end of experiment).
  3. Select the added element to browse its properties in the Property panel.
  4. Adjust the Brain Amp settings, if necessary.
  5. Select the channels for acquisition and buffering within EventIDE via the Selected channels property. The last channel carries the marker information.
  6. Once the channels are selected, you can access them with by of the signal processing elements.