To set the tone frequency:
Double-click the
ConstF
component, set the desired frequency in Hz, and click
OK
. Then
run the circuit as explained above.
Preparing a Suitable Enclosure
Noise exposure is performed inside a chamber to protect the researcher's hearing. You will
also need an enclosure inside the chamber to limit the movements of the agitated subject and
ensure it is positioned near the speaker. If you do not already have a suitable animal enclosure,
you can build one from widely available materials. This section provides general
recommendations for your chamber and enclosure.
Soundproof the Chamber
Line the inside of the chamber with acoustic foam to eliminate constructive or destructive
interference with the signal. See
for more information.
Build the Enclosure
Use mesh hardware cloth to create an oval tube or cylinder with a maximum width that
matches your selected speaker. Mesh hardware does not interfere with noise moving through
the chamber but will resist the subject's attempts to escape the space and be strong enough to
support the weight of a speaker placed at the top of the tube.
Use mesh hardware cloth to create a raised
fl
oor a few inches above the acoustic foam and a
lowered ceiling a few inches below the speaker. This will prevent the subject from damaging
the acoustic foam or the speaker in any attempt to escape the space.
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Noise Exposure | 74