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The Black Box Toolkit Page 17 of 98

Note: If you are using both external opto-detector modules you will not be able to

make use of the toolkit powered-in lines (BBTK Microphones, TTL-in etc.). If you

are using one additional opto-detector module you will be able to make use of one

additional powered-in line simultaneously.

The photodiode opto-detectors can be used for TFTs, CRTs and data projectors. In short,

any display device that emits enough luminescence to trigger the detector.

5.2. BBTK digital microphones

The toolkit offers support for up to two digital microphones [optional extra]. These allow for

two audio sources to be monitored on a remote PC.

If you purchased the microphone modules they can be plugged into the 3.5mm powered-in

lines of the toolkit (lines 1 and 2). A sensitivity potentiometer is located on the plug-in

module itself. The orange LED of the powered-in lines indicates that auditory activity has

been detected.

The microphone module should be positioned as close to the speaker/headphone of the

remote PC as possible. You should then use the “Sensor Threshold Check” tuning utilities

to adjust the microphone sensitivity to match your stimulus materials amplitude, as in

essence these modules function as a highly accurate voice-key.

Note: The BBTK Microphones are not the same as ordinary analogue

microphones. They are custom-built and include specialised circuitry to convert

analogue signals into digital ones at very high sampling rates. Although you may

be able to physically plug a microphone into the 3.5mm jack on the toolkit it will not

function correctly and may damage both your microphone and the toolkit. Any

damage caused as a result will void your warranty.

5.3. Passive switch closure detection on remote response devices

The toolkit can monitor for up to two switch closures on a remote PC. For example, you

can use a passive switch closure monitoring lead [optional extra] tacked onto a button of

your own response device. Then when you press a button/key the toolkit will also register

the properties of the response. Specifically the onset, duration and offset with sub-

millisecond accuracy. In sort, any suitable switch closure (see 13.3.1) or TTL signal can be

monitored using this method.

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Black Box IEEE 1284 Guía de usuario Pagina 17