Black Box IEEE 1284 Guia do Utilizador descarregar pdf (Página 95)

The Black Box Toolkit Page 95 of 98

13. BBTK SPECIFICATIONS

13.1. General Specifications of the Black Box Toolkit

• 8 channel - 4 digital input/4 digital output

o 2 opto-detector leads for detecting screen events on a second PC, Mac or

Linux system

o 2 switch closure channels for simulating button presses on equipment

running your paradigm

o 2 powered digital-in channels for BBTK microphones etc.

o 2 powered digital-out channels for BBTK tone generators etc.

• Fully modular so that additional custom sensors can be added

• Opto-isolated switch closure lines

• Sampling rates of over 48 kHz using a standard PC

• EPP 1.7 or 1.9 or Bi-directional parallel port interface to host PC

• Powered by external 5v supply

• 12 month warranty

13.2. Sensor and Generation Modules Timing Specifications

The timing tests were carried out using a digital oscilloscope and our own specialized

microphones and tone generators together with the standard software suite. Testing was

carried out using a 1.3 GHz AMD Athlon based computer with EPP 1.9 port.

Sensor or Module

Nominal

timing

characteristics

Black Box Sampling Rate across all 8 lines (typical

sampling rate on a 1.3Ghz Athlon)

48+ kHz

Powered input/output timed from parallel port to

input/output pin of peripheral or switch closure

<100nS

Microphone timed from output of tone generator to

parallel port (Op-amp amplified Electret mic – uses

microcontroller to detect peak and cancel false

triggering)

<50µS

Opto-detector input timed from diode to parallel port <100nS

2.5mm switch closure timed from parallel port to contact 35µS

Tone generator timed from parallel port to piezo sounder

pin (Piezo sounder with pitch and amplitude control via 2

potentiometers)

50µS ~ 625µS

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Black Box IEEE 1284 Guia do Utilizador Página 95