|
 The
Optical Receiver (aka USB 2.0 Interface) converts the
incoming fiber optic data to a stream of 32-bit words and sends it to
the PC via a USB 2.0 port. The data words
are buffered in a FIFO (first in, first out) memory with a capacity of 64 kWords,
ensuring the data are transferred reliably to the PC. The FIFO buffer is ample to ensure
sustained data acquisition with interrupt latency times found under Windows
XP.
 A 37-pin connector with 16 inputs and 16 outputs for trigger signals (TTL level) is available on the
back panel of the receiver. The
incoming trigger signals are mixed with the incoming data from the amplifier. The trigger
inputs allow easy setup of EP / ERP measurements, and event logging. The triggers
inputs are kept completely isolated from the front-end (no interference with electrode signals). The method of digital triggers has the most precise timing
(within 1 sample). The triggers are digitally stored in a separate trigger
channel, which is readily recognized by analysis programs.
Key Benefits
Here are some of the
benefits of the unique Optical Receiver design:
- Makes ActiveTwo completely portable when
used with a notebook computer.
- Programmable logic
allows easy changing of number of channels and sample rate.
- Trigger inputs
remain galvanically isolated from AD-box, electrodes and patient.
- Easy power supply
from PC via digital I/O card or USB 2.0 port.
- LED indicators for
data and FIFO overflow.
- Compatible with Windows XP.
Another version of the optical receiver
that works with a National Instruments PCI DIO-32HS high-speed parallel
I/O card is available for customers who specifically request it.
This alternate version is compatible with Windows 98 SE/NT/2000/XP.
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