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VPixx Technologies products
offer solutions to some of the more difficult technical challenges
facing vision scientists around the world today. Our
revolutionary DATAPixx data acquisition and graphics
system provides researchers with a hardware toolbox
implementing high performance video, analog I/O, digital I/O, and audio
I/O. By implementing all of these input / output functions in
a single peripheral, the DATAPixx resolves the long-standing technical
challenge of precisely synchronizating data input / output with video
refresh. For greatest flexibility, the DATAPixx can
be programmed through an ANSI C API, or from within the MATLAB
environment. For greatest convenience, the VPixx visual
testing program for Mac OS X can be used to quickly set up and run
experiments, and gather data.
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- Dual VGA outputs with 16-bit video DACs for
generation of very low contrast stimuli, with microsecond
synchronization between left / right displays
- 16 analog-to-digital converter channels with
16-bit resolution, fast 250 kSPS simultaneously sampled inputs, and
microsecond
synchronization to video refresh
- 4 digital-to-analog converter channels with
16-bit resolution, fast 2 MSPS simultaneously updated
outputs,
and microsecond synchronization to video refresh
- Stereo audio microphone input for low-latency
verbal response time measurement
- Stereo audio output with 96 kSPS updates, and
microsecond control over phase between audio left, audio right, and
video refresh
- 24 TTL outputs for triggering external
equipment with microsecond synchronization to video refresh
- 24 TTL inputs with microsecond timetagged
transitions, for high accuracy button response time measurement
- VESA mini-DIN-3 output for driving stereo
goggles
- USB 2.0 interface to host computer for data
transfer
- No special graphics board needed, can be used with a laptop
- Software support includes low-level ANSI C API,
MATLAB library, and high-level VPixx visual testing program
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- A single application contains a list of all
stimuli for an experiment
- Each stimulus is a list of region definitions
and sequencing commands
- Each region contains a list of patterns which
can be mathematically combined
- Double-clicking on a stimulus, region, pattern,
or command will open a parameter dialog for convenient stimulus editing
- Stimulus sequences controlled with per-frame
resolution
- Stimuli can be incorporated into many testing
paradigms including Constant Stimuli, Adjustments, Habituation,
Staircase, and VPEST
- Calibrated region colors can be specified in
LMS (cone response), and the CIE spaces XYZ, Lxy, Lu'v', L*u*v*, and
L*a*b*
- Stimulus sequences can be exported as picture
files and Quicktime movies for publishing or classroom demonstrations
- Supports DATAPixx data acquisition and graphics
system
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- NOTE: The VPGA is a PCI-only board, and is not
recommended for new installations. Please refer to the DATAPixx which
offers increased performance and greater functionality.
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