g.USBamp

Applications < Event-related potentials <

Highest accuracy biosignal data acquisition and processing system

g.USBamp - g.tec's latest 24 bit biosignal acquisition device - is the perfect tool for recording multimodal biosignal data with highest quality. This allows to investigate brain-, heart-, muscle-activity, eye movement, respiration, galvanic skin response and other body signals. g.USBamp is USB 2.0 enabled and comes with 16 simultaneous sampled biosignal channels. A total of 4 independent grounds guarantee no interference between the recorded signals. The amplifier is simply connected to the USB socket on your PC/notebook and can immediately be used for data recording. Build a multi-channel system with more than 16 channels using multiple g.USBamp devices (16 - 128 channels). A synchronization cable guarantees that all devices are sampling with exactly the same frequency. The amplifier has an input range of ± 250 mV, which allows to record DC signals without saturation. Digital inputs and outputs allow the recording of trigger channels together with the biosignal channels and to pass analysis results to the outside world. A short-cut input allows to connect the amplifier inputs fastly to ground potential to protect the amplifier against overflows occuring e.g. in operating rooms with gamma knifes. The g.USBamp can be combined with the g.EEGcap & the g.GAMMAcap and there is a huge range of possible electrodes.

Highlights

EEG, ECoG, ECG, EMG and EOG recording via USB
16 analog inputs with 24 Bit and a sampling frequency of up to 38.400 Hz per channel
Digital filtering of the biosignal data (DC - 2.4 kHz)
Over-sampling to achieve a high signal to noise ratio
Simultaneous sample and hold for all channels
Direct connection of electrodes with standard safety connectors or system conectors for a very fast electrode application
amplifier can be stacked to have a 32, 48, 64, 80 channel system

Excellent data quality

Each of the 16 analog to digital converters is operating at 2.4576 MHz. An oversampling of 64 times yields the internal sampling rate of 38.400 Hz per channel. A powerful floating point Digital Signal Processor performs in addition oversampling and real-time filtering of the biosignal data (between 0 Hz - 2.400 Hz). The sampling frequency can be selected up to 38.400 Hz.

Therefore, a typical sampling frequency of 256 Hz yields to an oversampling rate of 9.600. Hence, a very high signal to noise ratio is obtained especially needed in the recording of evoked potentials in EEG or in identifying small amplitude changes in high-resolution ECG recordings. You are measuring far below the noise-range of conventional amplifiers!

Filter coefficients

g.USBamp performs a bandpass and Notch filtering on a powerful Digital Signal Processor. The filters have a Butterworth caracteristic and more than 100 filters are predefined. Additionally MATLAB can be used to calculate your own filter coefficients with a specific characteristic and to download the new created coefficients to the device.

Calibration

For channel equalization - which is especially needed in multi-channel recordings - the device has an internal calibration unit. This feature adjusts the gain and offset of each channel with very high accuracy.

Test signal generation

The amplifier can generate an internal sinusoidal-, rectangular-, sawtooth or white-noise test signal. The amplitude and frequency of the signal can be modified to test the recording and analysis chain.

Skin-electrode impedance

In order to guarantee highest quality measurements the transition impedance of the skin to the electrode must be controlled. The internal impedance testing unit measures the impedance for the individual electrodes.

Split a 64 channel system

A big advantage is that e.g. a 64 channel system can be splitted into 4 separate units. When 64 channels are needed the 4 amplifiers are used together and thereafter 4 separate systems can be used e.g. for teaching purposes.

Classification of g.USBamp

Safety class II
Type of applied part CF
Protection against mechanical distortion and liquids IP41
Operation mode S1 (permanent operation)
Conformity class IIa

Important information

g.USBamp must not be used for patient monitoring or determination of brain death

g.USBamp brochure (PDF 670 kByte)

Available software components

For g.USBamp 4 different software components are available:

g.USBamp recording software (g.Recorder) - Allows the visualization and data storage of biosignal data. The software is fully based on graphical user interfaces and is easy to use. The software supports all features of g.USBamp like impedance measurement, calibration, control of the internal test signal. READ MORE
g.USBamp High-Speed Online Processing under SIMULINK - enables real-time biosignal processing and recording with maximum system speed under the SIMULINK environment. Hence advanced digital signal processing steps can easily be integrated with graphical SIMULINK blocks. The simplest program requires connecting 3 SIMULINK blocks via drag and drop. The toolbox is used for the setup of biofeedback, neurofeedback and brain-computer interface systems. READ MORE
Device driver for the MATLAB Data Acquisition Toolbox (MATLAB API) - g.USBamp can be directly programmed via the g.USBamp MATLAB API which is based on the MATLAB Data Acquisition Toolbox. The toolbox gives full access to the recording buffer and to the DAQ functionality and allows the quick and easy implementation of the data visualization, processing and storage applications under MATLAB. READ MORE
API/device driver package - For developers an application programming interface (API) is available. Hence programmers and system developers can rely on the certified amplifier realizing their own sophisticated data acquisition and processing software almost under any programming language. READ MORE
g.USBamp device driver LabView 8.6 - gives access to the specific hardware settings like analog channel selection, digital I/O lines, SD card streaming,... Just put the g.USBamp in your LABVIEW program and start the biosignal acquisition and analysis. READ MORE

Accessories

g.ACCUpack - battery supply for the amplifier
Adapter cable for electro-cap - allows the direct connection of the amplifier to the electrode cap
g.TRIGbox - optical-, acoustic- or digital trigger acquisition
electrodes
g.EEGcap & g.GAMMAcap
synchronization cable for 4 g.USBamps to synchronize different biosignals at the g.USBamp

The g.USBamp is available in stainless steel and in the gold edition.

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