User Reference:gUSBampADC

Function

The gUSBampADC filter acquires data from up to eight (tested up to four) g.USBamp EEG amplifiers. g.USBamp is an amplifier/digitizer combination from g.tec medical engineering GmbH/Guger Technologies OEG (http://www.gtec.at). Support for this device in BCI2000 consists of two components: A BCI2000-compatible Source Module (gUSBampSource.exe) and a command-line tool (USBampgetinfo).

g.USBamp Hardware

The USBamp consists of 16 independent 24-bit A/D converters that can sample at up to 38.4kHz per channel. Because there is one A/D converter for each channel, one particular sample is digitized at the exact same time for each channel. This is unlike with traditional A/D converter boards that only have one A/D converter. BCI2000 has a feature that can align samples in time (parameter AlignChannels). Because this feature is not needed in conjunction with the USBamp, it needs to be turned off (i.e., AlignChannels needs to be 0).

Parameters

Parameters common to all source modules are described under User Reference:DataIOFilter. In addition, the gUSBampADC provides the following parameters:

DeviceIDMaster

Serial number (e.g., UA-2007.01.01) of the master device. If you only have one device, this parameter has to equal DeviceIDs. If you have more than one device, then this parameter represents the serial number of the device whose SYNC goes to the slaves, i.e., the only device that has a cable connected at SYNC OUT, but none connected to SYNC IN. If only one device is connected, this parameter may be set to auto.

DeviceIDs

List of serial numbers (e.g., UA-2007.01.01) of all devices. If you have more than one device, this list determines the order of the channels in the data file. If only one device is connected, this parameter may be set to auto.

FilterEnabled

Choose 1 if you want a pass band filter, and 0 if you don't. The gUSBamp is a DC amplifier and thus you most likely will want a pass band filter. Please note that, because the g.USBamp internally has a 5kHz antialiasing filter and always samples with 38.4kHz, you DO NOT need to enable any filter if you do not want. You will never experience aliasing.

FilterHighPass

High pass frequency for pass band. You need to query the amp for possible values. See description of the USBampgetinfo tool for more info.

FilterLowPass

Low pass frequency for pass band. See description of the USBampgetinfo tool for more info.

FilterModelOrder

Model order for passband filter. See description of the USBampgetinfo tool for more info.

FilterType

Type of passband filter:

• 1=CHEBYSHEV,
• 2=BUTTERWORTH.

NotchEnabled

Choose 1 if you want a notch filter, and 0 if you don't.

NotchHighPass

Similar to FilterHighPass.

NotchLowPass

Similar to FilterLowPass.

NotchModelOrder

Similar to FilterModelOrder.

NotchType

Similar to FilterType.

SampleBlockSize

Samples per channel per digitized block. Together with the sampling rate, this parameter determines how often per second data are collected, processed, and feedback is updated. For example, at 600 Hz sampling and a SampleBlockSize of 20, the system (e.g., source signal display, signal processing, and stimulus presentation) would be updated 30 times per second.

SamplingRate

The sampling rate of all connected USBamps. If one wants to use a bandpass or a notch filter, there needs to be a filter configuration for that particular sampling rate (see the section on the [USBampgetinfo] tool). (Guger Technologies can provide you with a new driver configuration file if you need a different filter.)

The USBamp supports the following sampling rates: 32, 64, 128, 256, 512, 600, 1200, 2400, 4800, 9600, 19200, and 38400 Hz. All sampling rates are supported for one or more amplifiers. If you are sampling at high rates and from multiple amplifiers, the CPU may be overloaded depending on the speed of your computer and the BCI2000 configuration. In case you are experiencing problems (e.g., data loss, jerky display, etc.), increase the SampleBlockSize so that you are updating the system less frequently (usually, updating the system 20-30 times per second is sufficient for most applications), and increase Visualize->VisualizeSourceDecimation. This parameter will decrease the number of samples per second that are actually drawn in the Source display.

SourceCh

The total number of channels across all USBamp devices.

SourceChDevices

The number of channels acquired from each device. If there is only one device, this parameter has to equal SourceCh. For example, '16 8' will acquire channels from the first device listed under DeviceIDs, and 8 channels from the second device listed under DeviceIDs. Data acquisition always starts at channel 1. The sum of all channels (e.g., 24 in this example) has to equal the value of SourceCh.

SourceChList

The list of channels that should be acquired from each device. The total number of channels listed should correspond to SourceCh. For more than one device, SourceChDevices determines how the SourceChList values are mapped to each device. For example if SourceChDevices = '8 8' and SourceChList = '1 2 3 4 13 14 15 16 5 6 7 8 9 10 11 12', then channels 1-4 and 13-16 will be acquired on the first device, and channels 5-12 will be acquired on the second device. These channels will be saved in the data file as 16 contiguous channels. The order of channels does not matter; i.e., '1 2 3 4' is the same as '2 3 1 4'. The channels are always in ascending order on a single device. Channels may not be listed twice on a single device; e.g., entering '1 2 3 4 5 6 7 1' if SourceChDevices = '8' will result in an error. If this parameter is left blank (the default), then all channels are acquired on all devices.

EnableDigitalInput

Enable digital input. If enabled, the sampled values of the digital input from the digital I/O ports will be stored in to states DigitalInput1 - DigitalInput64 depending on the number of amps connected and hardware versions. See Digital Input for more information.

EnableDigitalOutput

1

Enable digital output (prior to data acquisition).

If enabled, the digital output is set to the values returned when the signals go through the expressions given by the Parameter DigitalOutputEx. See Digital Output for more information. Digital outputs will be set prior to data acquisition.

2

Timing test.

If this option is chosen, DigitalOutput1 will be set zero while waiting for data, and to 1 once data has arrived. This can be used to measure amplifier latency (see BCI2000Certification).

3

Enable digital output (after to data acquisition).

If enabled, the digital output is set to the values returned when the signals go through the expressions given by the Parameter DigitalOutputEx. See Digital Output for more information. Digital outputs will be set after data acquisition.

DigitalOutputEx

If digital output is turned on, the given expressions will be evaluated for the current input (if EnableDigitalOutput=1) resp. output (if EnableDigitalOutput=3). If the expression evaluates true for any sample in the current data block, the bit is set to high, else set to low. Each expression represents a different bit and the number starts with the master and is continuous through all amps like digital input. Boolean expressions work well for this ( ex. ((StimulusCode == 0) && Running) ). See Expressions for more information on how to write expressions.

AcquisitionMode

If set to analog signal acquisition, the g.USBamp records analog signal voltages (default). If set to Calibration, the signal output is a sine wave test signal generated by the g.USBamp (which can be used to verify correct system calibration). If set to Impedance, regular analog signal acquisition is preceded by an impedance test. This impedance test reports input impedances for each channel in kOhms. In impedance mode, if the ground and reference is connected in the amp internally (using the CommonGround and CommonReference parameters), then you need to connect the ground and reference to block 4.

DetectDataLoss

The gUSBamp allows to obtain a count of the total number of samples that have been digitized so far. By comparing this count to the previous data block's count, it is possible to determine whether samples have been lost. If DetectDataLoss is set to 1, the counter is enabled but will reduce the number of available channels by 1. It is always the last (16th) channel of the last amplifier that is being used for the counter. Whenever data loss is detected, a warning message will be written to the system log.

CommonGround

This parameter determines whether the g.USBamp internally connects the GND inputs from all blocks together. If enabled (default), then the signal ground only needs to be connected to one input block, e.g., block 1. Otherwise, all GND inputs need to be externally connected.

CommonReference

The same as CommonGround, except for the signal reference.

Digital I/O

Digital Inputs

Can be used with 1 - 8 gUSBamps.

gUSBamps with UA serial numbers

If you are looking at the connector on the back of the amp (as shown in the image above), Pin 1 is at the top left, the ordering continues in a counter-clockwise manner, and terminates at the center with pin 7 (ground). Each gUSBamp has only one digital I/O port and this is stored in only one state per an gUSBamp. If multiple UA gUSBamps are connected in sync then up to state DigitalInput8 will be used, with the master gUSBamp using DigitalInput1 and the last slave gUSBamp using DigitalInput8 if 8 gUSBamps are used, or DigitalInput6 if only 6 gUSBamps are used. To access the digital input from any gUSBamp, access the state DigitalInput for the number of that slave gUSBamp. For example, if I wanted to access the 5th gUSBamp, I would access DigitalInput5.

gUSBamps with UB serial numbers

Each gUSBamp has two digital I/O ports which are stored in eight states per gUSBamp. If multiple UB gUSBamp are connected in sync then up to state DigitalInput64 will be used with the master gUSBamp using DigitalInput1 - DigitalInput8 and the last gUSBamp using DigitalInput57 - DigitalInput64 if 8 gUSBamps are used, and DigitalInput41 - DigitalInput48 if only 6 gUSBamps are used. To access the digital input from any gUSBamp, take the number of gUSBamps preceding the intended gUSBamp multiplied by 8, then add the number of the bit you want to see. For example, if I wanted to access the 5th gUSBamp's 5th bit, I would look at DigitalInput37 (4 * 8 + 5).

g.USBamps in sync with both UA and UB serial numbers

The device specifications are the same as above and each gUSBamp only has the number of states designated to it as specified above, i.e. each UB gUSBamp has eight states and each UA gUSBamp has only one state. The numbering of the states are based on the order of the gUSBamps. For example, if we have the following setup: UB gUSBamp as master with slaves in the following order: UB UA UA UB UA UA, which gives a total of 7 gUSBamps using DigitalInput1 - DigitalInput24 (3 * 8 + 4 * 1).For example, to access the second UA gUSBamp (which has only one state), I would look at DigitalInput18, found by the number of UB gUSBamps preceding the second UA gUSBamp multiplied by 8 plus the number of UA gUSBamps preceding it plus one for the gUSBamp itself (2 * 8 + 1 + 1). To access the third UB gUSBamp's seventh bit, I would look at DigitalInput25. This was found in the same manner as above but because it is a UB gUSBamp the specific bit is added instead of just one (2 * 8 + 2 + 7).

To setup a link between gUSBamps UA and UB, the following images show how to connect them.

Digital Output

Can be used with 1 - 8 gUSBamps.

gUSBamps with UA serial numbers

Each gUSBamp has one digital I/O port giving it two digital output bits. If multiple UA gUSBamps are connected there are a total of 16 digital output bits possible. To write to these bits, Parameter DigitalOutputEx must be filled. Each row correlates to a bit. The numbering of the bits start with 1 and 2 being the master gUSBamp and continues numbering until the eighth gUSBamp having bit 15 and 16. To determine which row to use, the bit is found by taking the number of amgUSBampsps preceding the intended gUSBamp in the chain multiplied by two and then add the number of the bit you want to write for. For example, the second bit of the fourth gUSBamp is row 8 (3 * 2 + 2).

gUSBamps with UB serial numbers

Each gUSBamp has two digital I/O ports giving it four digital output bits. If multiple UB gUSBamps are connected, that gives a total of 32 digital output bits possible. To write to these bits, Parameter DigitalOutputEx must be filled. Each row corresponds to a bit. The numbering of the bits start with 1 - 4 being the master gUSBamp and continues numbering until the eighth gUSBamp having bits 29 - 32. To figure out which row to use, the formula is the number of gUSBamps preceding the intended gUSBamp in the chain multiplied by four and then add the number of the bit you want to write for. For example the second bit of the fourth gUSBamp is row 14 (3 * 4 + 2).

gUSBamps in sync with both UA and UB serial numbers

The device specs are the same as above with each UA gUSBamp having two digital output bits and each UB gUSBamp having four digital output bits. To write the proper row, the order of the gUSBamps matter just like digital input. For example we have the setup of UB gUSBamp as master with the slaves in the following order: UB UA UA UB UA UA, which gives a total of 7 gUSBamps having a total of 20 digital output bits. To find the row that corresponds with the bit you want to write for, take the number of UB gUSBamps preceding the intended gUSBamp in the chain multiplied by 4 and add the number of UA gUSBamps preceding the intended gUSBamp in the chain multiplied by 2 and add the number of the bit you want. For example to write the expression for the second UA gUSBamp's first bit, I would write the expression in row 11 (2 * 4 + 1 * 2 + 1). For example to write the expression for the third UB gUSBamp's third bit, I would write the expression in row 15 (2 * 4 + 2 * 2 + 3).

States

DigitalInput

DigitalInput ranges from DigitalInput1 - DigitalInput64 (see Digital Input for explanation) and the values are either a 0 or a 1.

Additional Information

Using 32bit Executables on 64bit Installations

BCI2000 supports compilation of the gUSBamp source module for 64bit targets. The resulting executable will run on 64bit systems, and work with the 64bit version of the gUSBamp drivers. However, the binary distribution of BCI2000 contains 32bit executables. These run fine under 64bit systems, but you will need to perform these additional driver installation steps to install 32bit gUSBamp API DLLs on 64bit systems:

• Execute gtec's 32bit driver installer on your 64bit system.
• After successful installation, execute gtec's 64bit driver installer on your 64bit system.
• You will now have both the 32bit API DLL and the 64bit API DLL installed, such that both 32bit and 64bit executables will be able to connect to a gUSBamp attached to the system's USB ports.

The USBampgetinfo Command Line Tool

This command line tool displays all connected USBamps, including their serial number and the USB port that they connect to. Further, this tool reads, for the first of the connected amplifiers, all supported bandpass and notch filter configurations. Thus, this tool can be used to determine which filters can be used for a particular sampling frequency within BCI2000. The following is an example screen output:

*******************************************
BCI2000 Information Tool for g.USBamp
*******************************************
(C)2004 Gerwin Schalk
	 Wadsworth Center
	 New York State Department of Health
	 Albany, NY, USA
*******************************************
Amp found at USB address 1 (S/N: UA-200X.XX.XX)
Printing info for first amp (USB address 1)

Available bandpass filters
===================================
num| hpfr  | lpfreq |  sfr | or | type
===================================
000|  0.10 |    0.0 |   32 |  8 | 1
001|  1.00 |    0.0 |   32 |  8 | 1
002|  2.00 |    0.0 |   32 |  8 | 1
003|  5.00 |    0.0 |   32 |  8 | 1
004|  0.00 |   15.0 |   32 |  8 | 1
005|  0.01 |   15.0 |   32 |  8 | 1
006|  0.10 |   15.0 |   32 |  8 | 1
007|  0.50 |   15.0 |   32 |  8 | 1
008|  2.00 |   15.0 |   32 |  8 | 1
009|  0.10 |    0.0 |   64 |  8 | 1
010|  1.00 |    0.0 |   64 |  8 | 1
011|  2.00 |    0.0 |   64 |  8 | 1
012|  5.00 |    0.0 |   64 |  8 | 1
013|  0.00 |   30.0 |   64 |  8 | 1
014|  0.01 |   30.0 |   64 |  8 | 1
015|  0.10 |   30.0 |   64 |  8 | 1
016|  0.50 |   30.0 |   64 |  8 | 1
017|  2.00 |   30.0 |   64 |  8 | 1
018|  0.10 |    0.0 |  128 |  8 | 1
019|  1.00 |    0.0 |  128 |  8 | 1
020|  2.00 |    0.0 |  128 |  8 | 1
021|  5.00 |    0.0 |  128 |  8 | 1
022|  0.00 |   30.0 |  128 |  8 | 1
023|  0.00 |   60.0 |  128 |  8 | 1
024|  0.01 |   30.0 |  128 |  8 | 1
025|  0.01 |   60.0 |  128 |  8 | 1
026|  0.10 |   30.0 |  128 |  8 | 1
027|  0.10 |   60.0 |  128 |  8 | 1
028|  0.50 |   30.0 |  128 |  8 | 1
029|  0.50 |   60.0 |  128 |  8 | 1
030|  2.00 |   30.0 |  128 |  8 | 1
031|  2.00 |   60.0 |  128 |  8 | 1
032|  0.10 |    0.0 |  256 |  8 | 1
033|  1.00 |    0.0 |  256 |  8 | 1
034|  2.00 |    0.0 |  256 |  8 | 1
035|  5.00 |    0.0 |  256 |  8 | 1
036|  0.00 |   30.0 |  256 |  8 | 1
037|  0.00 |   60.0 |  256 |  8 | 1
038|  0.00 |  100.0 |  256 |  8 | 1
039|  0.01 |   30.0 |  256 |  6 | 1
040|  0.01 |   60.0 |  256 |  8 | 1
041|  0.01 |  100.0 |  256 |  8 | 1
042|  0.10 |   30.0 |  256 |  8 | 1
043|  0.10 |   60.0 |  256 |  8 | 1
044|  0.10 |  100.0 |  256 |  8 | 1
045|  0.50 |   30.0 |  256 |  8 | 1
046|  0.50 |   60.0 |  256 |  8 | 1
047|  0.50 |  100.0 |  256 |  8 | 1
048|  2.00 |   30.0 |  256 |  8 | 1
049|  2.00 |   60.0 |  256 |  8 | 1
050|  2.00 |  100.0 |  256 |  8 | 1
051|  5.00 |   30.0 |  256 |  8 | 1
052|  5.00 |   60.0 |  256 |  8 | 1
053|  5.00 |  100.0 |  256 |  8 | 1
054|  0.10 |    0.0 |  512 |  8 | 1
055|  1.00 |    0.0 |  512 |  8 | 1
056|  2.00 |    0.0 |  512 |  8 | 1
057|  5.00 |    0.0 |  512 |  8 | 1
058|  0.00 |   30.0 |  512 |  8 | 1
059|  0.00 |   60.0 |  512 |  8 | 1
060|  0.00 |  100.0 |  512 |  8 | 1
061|  0.00 |  200.0 |  512 |  8 | 1
062|  0.01 |   30.0 |  512 |  6 | 1
063|  0.01 |   60.0 |  512 |  6 | 1
064|  0.01 |  100.0 |  512 |  6 | 1
065|  0.01 |  200.0 |  512 |  8 | 1
066|  0.10 |   30.0 |  512 |  8 | 1
067|  0.10 |   60.0 |  512 |  8 | 1
068|  0.10 |  100.0 |  512 |  8 | 1
069|  0.10 |  200.0 |  512 |  8 | 1
070|  0.50 |   30.0 |  512 |  8 | 1
071|  0.50 |   60.0 |  512 |  8 | 1
072|  0.50 |  100.0 |  512 |  8 | 1
073|  0.50 |  200.0 |  512 |  8 | 1
074|  2.00 |   30.0 |  512 |  8 | 1
075|  2.00 |   60.0 |  512 |  8 | 1
076|  2.00 |  100.0 |  512 |  8 | 1
077|  2.00 |  200.0 |  512 |  8 | 1
078|  5.00 |   30.0 |  512 |  8 | 1
079|  5.00 |   60.0 |  512 |  8 | 1
080|  5.00 |  100.0 |  512 |  8 | 1
081|  5.00 |  200.0 |  512 |  8 | 1
082|  0.10 |    0.0 |  600 |  8 | 1
083|  1.00 |    0.0 |  600 |  8 | 1
084|  2.00 |    0.0 |  600 |  8 | 1
085|  5.00 |    0.0 |  600 |  8 | 1
086|  0.00 |   30.0 |  600 |  8 | 1
087|  0.00 |   60.0 |  600 |  8 | 1
088|  0.00 |  100.0 |  600 |  8 | 1
089|  0.00 |  200.0 |  600 |  8 | 1
090|  0.00 |  250.0 |  600 |  8 | 1
091|  0.01 |   60.0 |  600 |  6 | 1
092|  0.01 |  100.0 |  600 |  6 | 1
093|  0.01 |  200.0 |  600 |  6 | 1
094|  0.01 |  250.0 |  600 |  8 | 1
095|  0.10 |   60.0 |  600 |  8 | 1
096|  0.10 |  100.0 |  600 |  8 | 1
097|  0.10 |  200.0 |  600 |  8 | 1
098|  0.10 |  250.0 |  600 |  8 | 1
099|  0.50 |   30.0 |  600 |  8 | 1
100|  0.50 |   60.0 |  600 |  8 | 1
101|  0.50 |  100.0 |  600 |  8 | 1
102|  0.50 |  200.0 |  600 |  8 | 1
103|  0.50 |  250.0 |  600 |  8 | 1
104|  2.00 |   30.0 |  600 |  8 | 1
105|  2.00 |   60.0 |  600 |  8 | 1
106|  2.00 |  100.0 |  600 |  8 | 1
107|  2.00 |  200.0 |  600 |  8 | 1
108|  2.00 |  250.0 |  600 |  8 | 1
109|  5.00 |   30.0 |  600 |  8 | 1
110|  5.00 |   60.0 |  600 |  8 | 1
111|  5.00 |  100.0 |  600 |  8 | 1
112|  5.00 |  200.0 |  600 |  8 | 1
113|  5.00 |  250.0 |  600 |  8 | 1
114|  0.10 |    0.0 | 1200 |  8 | 1
115|  1.00 |    0.0 | 1200 |  8 | 1
116|  2.00 |    0.0 | 1200 |  8 | 1
117|  5.00 |    0.0 | 1200 |  8 | 1
118|  0.00 |   30.0 | 1200 |  8 | 1
119|  0.00 |   60.0 | 1200 |  8 | 1
120|  0.00 |  100.0 | 1200 |  8 | 1
121|  0.00 |  200.0 | 1200 |  8 | 1
122|  0.00 |  250.0 | 1200 |  8 | 1
123|  0.00 |  500.0 | 1200 |  8 | 1
124|  0.01 |  100.0 | 1200 |  6 | 1
125|  0.01 |  200.0 | 1200 |  6 | 1
126|  0.01 |  250.0 | 1200 |  6 | 1
127|  0.01 |  500.0 | 1200 |  6 | 1
128|  0.10 |  100.0 | 1200 |  6 | 1
129|  0.10 |  200.0 | 1200 |  8 | 1
130|  0.10 |  250.0 | 1200 |  8 | 1
131|  0.10 |  500.0 | 1200 |  8 | 1
132|  0.50 |  100.0 | 1200 |  8 | 1
133|  0.50 |  200.0 | 1200 |  8 | 1
134|  0.50 |  250.0 | 1200 |  8 | 1
135|  0.50 |  500.0 | 1200 |  8 | 1
136|  2.00 |  100.0 | 1200 |  8 | 1
137|  2.00 |  200.0 | 1200 |  8 | 1
138|  2.00 |  250.0 | 1200 |  8 | 1
139|  2.00 |  500.0 | 1200 |  8 | 1
140|  5.00 |  100.0 | 1200 |  8 | 1
141|  5.00 |  200.0 | 1200 |  8 | 1
142|  5.00 |  250.0 | 1200 |  8 | 1
143|  5.00 |  500.0 | 1200 |  8 | 1
144|  0.10 |    0.0 | 2400 |  8 | 1
145|  1.00 |    0.0 | 2400 |  8 | 1
146|  2.00 |    0.0 | 2400 |  8 | 1
147|  5.00 |    0.0 | 2400 |  8 | 1
148|  0.00 |   30.0 | 2400 |  8 | 1
149|  0.00 |   60.0 | 2400 |  8 | 1
150|  0.00 |  100.0 | 2400 |  8 | 1
151|  0.00 |  200.0 | 2400 |  8 | 1
152|  0.00 |  250.0 | 2400 |  8 | 1
153|  0.00 |  500.0 | 2400 |  8 | 1
154|  0.00 | 1000.0 | 2400 |  8 | 1
155|  0.01 |  200.0 | 2400 |  4 | 1
156|  0.01 |  250.0 | 2400 |  6 | 1
157|  0.01 |  500.0 | 2400 |  6 | 1
158|  0.01 | 1000.0 | 2400 |  6 | 1
159|  0.10 |  200.0 | 2400 |  6 | 1
160|  0.10 |  250.0 | 2400 |  6 | 1
161|  0.10 |  500.0 | 2400 |  8 | 1
162|  0.10 | 1000.0 | 2400 |  8 | 1
163|  0.50 |  200.0 | 2400 |  8 | 1
164|  0.50 |  250.0 | 2400 |  8 | 1
165|  0.50 |  500.0 | 2400 |  8 | 1
166|  0.50 | 1000.0 | 2400 |  8 | 1
167|  2.00 |  200.0 | 2400 |  8 | 1
168|  2.00 |  250.0 | 2400 |  8 | 1
169|  2.00 |  500.0 | 2400 |  8 | 1
170|  2.00 | 1000.0 | 2400 |  8 | 1
171|  5.00 |  200.0 | 2400 |  8 | 1
172|  5.00 |  250.0 | 2400 |  8 | 1
173|  5.00 |  500.0 | 2400 |  8 | 1
174|  5.00 | 1000.0 | 2400 |  8 | 1
175|  0.10 |    0.0 | 4800 |  6 | 1
176|  1.00 |    0.0 | 4800 |  8 | 1
177|  2.00 |    0.0 | 4800 |  8 | 1
178|  5.00 |    0.0 | 4800 |  8 | 1
179|  0.00 |   30.0 | 4800 |  8 | 1
180|  0.00 |   60.0 | 4800 |  8 | 1
181|  0.00 |  100.0 | 4800 |  8 | 1
182|  0.00 |  200.0 | 4800 |  8 | 1
183|  0.00 |  250.0 | 4800 |  8 | 1
184|  0.00 |  500.0 | 4800 |  8 | 1
185|  0.00 | 1000.0 | 4800 |  8 | 1
186|  0.00 | 2000.0 | 4800 |  8 | 1
187|  0.01 |  500.0 | 4800 |  6 | 1
188|  0.01 | 1000.0 | 4800 |  6 | 1
189|  0.01 | 2000.0 | 4800 |  6 | 1
190|  0.10 |  500.0 | 4800 |  6 | 1
191|  0.10 | 1000.0 | 4800 |  6 | 1
192|  0.10 | 2000.0 | 4800 |  8 | 1
193|  0.50 |  500.0 | 4800 |  8 | 1
194|  0.50 | 1000.0 | 4800 |  8 | 1
195|  0.50 | 2000.0 | 4800 |  8 | 1
196|  2.00 |  500.0 | 4800 |  8 | 1
197|  2.00 | 1000.0 | 4800 |  8 | 1
198|  2.00 | 2000.0 | 4800 |  8 | 1
199|  5.00 |  500.0 | 4800 |  8 | 1
200|  5.00 | 1000.0 | 4800 |  8 | 1
201|  5.00 | 2000.0 | 4800 |  8 | 1

Available notch filters
===================================
num| hpfr  | lpfreq |  sfr | or | type
===================================
000| 48.00 |   52.0 |  128 |  4 | 1
001| 58.00 |   62.0 |  128 |  4 | 1
002| 48.00 |   52.0 |  256 |  4 | 1
003| 58.00 |   62.0 |  256 |  4 | 1
004| 48.00 |   52.0 |  512 |  4 | 1
005| 58.00 |   62.0 |  512 |  4 | 1
006| 48.00 |   52.0 |  600 |  4 | 1
007| 58.00 |   62.0 |  600 |  4 | 1
008| 48.00 |   52.0 | 1200 |  4 | 1
009| 58.00 |   62.0 | 1200 |  4 | 1
010| 48.00 |   52.0 | 2400 |  4 | 1
011| 58.00 |   62.0 | 2400 |  4 | 1
012| 48.00 |   52.0 | 4800 |  4 | 1
013| 58.00 |   62.0 | 4800 |  4 | 1

Certification Results

The g.USBamp certification was performed to give a better understanding of the restraints that must be placed on the system when using this device. Certification success criteria was determined internally and without rigor, and reflects our experience with psychophysical experiments and the performance we expect to need for the system. More information about certification testing can be found on the certification wiki page.

PC Specifications

• Lenovo Thinkpad E580 (https://www.lenovo.com/us/en/laptops/thinkpad/thinkpad-e-series/ThinkPad-E580/p/22TP2TEE580)
• Processor: Intel(R) Core(TM) i5-7200U CPU @ 2.50GHz 2.7GHz
• Installed Ram: 8.00 GB
• Graphics Card: Intel(R) HD Graphics 620
• System Type: 64-bit operating system, x64-based processor
• BCI2000 compiled with MSVC2019 and Qt 5.15.2
• g.USBamp UB with driver version 3.16.00 installed

Certification Tests Performed

Certification testing varied sampling rate (512, 1200, 2400, 4800 Hz), number of channels (4, 8, 16 ch), block size (50, 100 ms), and task (P3Spell (7x7 grid), P3Spell (1x1 grid), CursorTask, CursorTaskLow, and StimulusPresentation), for a total of 120 performed tasks.

Success Criteria and Overall Results

Name	Actual Latency	Success Criteria	Result
Amplifier Latency Mean	1.76ms	7 ms	passed
Amplifier Latency STD	985µs	2 ms	passed
Timestamp Latency Mean	87.2µs	1 ms	passed
Timestamp Latency STD	375µs	1 ms	passed
Processing Latency Mean	8.27ms	20 ms	passed
Processing Latency STD	6.69ms	10 ms	passed
Video Latency Mean	54.3ms	65 ms	passed
Video Latency STD	8.3ms	20 ms	passed
Audio Latency Mean	60ms	65 ms	passed
Audio Latency STD	4.16ms	20 ms	passed

See also

User Reference:DataIOFilter, Programming Reference:GenericADC Class