Meeting Tomorrow's Needs for
MS-Windows based interface and control software.
Script-language parser for use in experiments (This allows a researcher
to easily structure complex, repeatable experiments, and allows for data
Image translation (capable of translating BMP or DIB format bitmaps as
well as NTSC or PAL/SECAM video into an electro-tactile equivalent)
Digital Signal Processor based sub-system
16 simultaneous waveform generation channels each of which can be independently
The waveform of the energy delivered by each tactor is programmable over
a wide practical range.
Each channel drives up to 48 multiplexed tactors
0.1us timing resolution.
16-bit data (65,535 combinations) for frame rate, images per frame, pulse
phase width, inter-pulse null, and number of pulses.
2 8-bit D/A ports associated with each channel (32 total).
Frame rate and images per frame independently controlled global variables.
Pulse width, pulse amplitude (for each phase), inter-pulse null, and the
number of pulses per burst are each independently controlled variables
for each tactor (see figure below).
Better than 100 Hz frame rate with 768 tactors (depending on pulse parameters
Composite voltage waveform with various programmable features:
Pulse Amplitude (only one phase is programmable, the other phase is determined
by the pH neutrality criterion)
Inter-Pulse Null (the delay between consecutive pulse in a multiple pulse
Pulse Number (in a multiple pulse burst)
Image Frame Rate
The very fast timing required for the control of these pulse parameters
is managed by a set of 4 Field Programmable Gate Array (FPGA) counter arrays
that are seen on the Remote Processor Card shown below.
Watchdog timer system for monitoring software or hardware faults.
Capable of interfacing to a PC-based image-grabber board for video camera
35 dedicated A/D ports, 2 general purpose (currently connected to potentiometers
for user-control input).
Overall operation entirely software configured - no PROMs need be reprogrammed
for system software updates.
Isolated power is derived from the host PC, or from a battery in the stand-alone
portable mode (not connected to a host computer).
Multichannel electrotactile array technology consisting of thin, flexible,
and relatively inexpensive laminated Kapton/conductive Kapton substrate,
with titanium electrodes configured according to your specifications.
Point Linear Array
look at tactors
System may be interfaced to other array technologies such as electromechanical
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