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#X text 7 3 1) Given two simultaneous \, periodic sounds \, how far
does the second frequency have to be from the first so that you hear
one \, steady sound? Does this change for different frequency ranges?
For different types of signals?;
#X text 7 159 Directions:;
#X text 7 178 1) Make sure this part of the patch is turned on. There
should be an X in the On/Off box in the top-left corner.;
#X text 7 268 3) Choose a signal type. The default is sinusoid. You
can change signal types by clicking the boxes in the global controls
window.;
#X text 7 210 2) Choose a value for Freq 1--the default is A440. You
can do this by clicking in the box and dragging the mouse up and down
(to increase and decrease respectively) or by typing a number into
the box and hitting enter.;
#X text 7 313 4) Set Freq 2 to the same value as Freq 1;
#X text 7 332 5) Click in the Freq 2 box and drag the mouse so that
the frequency slowly changes. When you hear a steady sound \, stop
and record the two frequencies.;
#X text 7 377 6) Repeat steps 2-4 with sawtooth and square waves at
A440. Repeat steps 2-4 with a much lower sounding frequency and a much
higher sounding frequency.;
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#X text 5 133 Directions:;
#X text 5 152 1) Make sure this part of the patch is turned on. There
should be an X in the On/Off box in the top-left corner.;
#X text 255 66 Amp 1;
#X text 255 92 Amp 2;
#X text 8 4 2) What is your Just Noticeable Difference (JND) for amplitude?
Is it different for different amplitude ranges? If so \, characterize
the difference.;
#X text 5 184 2) You will want to set your global level to a constant
value. To do this \, bring the volume all the way down \, set Amp1
to 100 \, then bring the global volume up as high as is comfortable.
;
#X text 5 242 3) Set both Amp1 and Amp2 to 100 . Note that both Amp1
and Amp2 are in linear units rather than decibels.;
#X text 5 274 4) Change the value of Amp2 slightly.;
#X text 5 293 5) Use the toggle button to toggle between Amp1 and Amp2.
If you don't hear a difference \, change the value of Amp2 a little
more and repeat until you do. Record the values for Amp1 and Amp2.
;
#X text 5 350 6) Repeat steps 3-5 with Amp1 set to 30 and then to 10
.;
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#X text 182 94 Freq 1;
#X text 182 122 Freq 2;
#X text 11 168 Directions:;
#X text 11 192 1) Make sure this part of the patch is turned on. There
should be an X in the On/Off box in the top-left corner.;
#X text 10 251 3) Change the value of Freq2 slightly. You can input
a decimal value by holding down shift while dragging in the box or
by typing in a decimal value and pushing enter.;
#X text 9 297 4) use the toggle button to toggle between Freq1 and
Freq2. If you don't hear a difference \, change the value of Freq2
a little more and repeat until you do. Record the values for Freq1
and Freq2.;
#X text 8 8 3) What is your JND for frequency? Is it different for
different frequency ranges? If so \, characterize the difference.;
#X text 11 229 2) Set both Freq1 and Freq2 to 440 Hz.;
#X text 9 355 5) Repeat steps 2-4 with Freq1 set to 100 and 2000 Hz.
;
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#X text 8 220 To access the patch for;
#X text 8 242 a question \, click the;
#X text 8 264 appropriate box below.;
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#X text 6 2 Interface Help;
#X text 30 23 Bang;
#X text 31 89 Toggle;
#X text 52 169 Number Box;
#X text 35 371 Slider;
#X text 11 41 A bang is a button that has no state (see toggle) and
is used to trigger something. Clicking on one should do whatever the
label next to it says.;
#X text 11 109 A toggle is a button that has state (it either has an
X in it or it does not). Toggles are often used as on/off switches
\, with an X indicating that something has been turned on.;
#X text 11 193 A number box lets you set values. You can enter things
into a number box in two ways. The easiest way to enter a specific
number is to click in the box \, type the desired number \, then press
return. If would like to scroll through settings \, you can click in
the box and move the mouse up or down while holding down the (left)
button. This will scroll through by ones. To scroll through by hundredths
\, hold down the shift key while scrolling. If a box won't let you
scroll below or above a particular number \, it has been set not to
let you slide past that number for some reason. Wile you can probably
type the number in and have it work \, it might be a bad idea \, since
the boundary was put there for a reason.;
#X text 34 404 the slider bar up or down to change its value.;
#X text 34 390 Sliders work a lot like number boxes. Click and drag
;
#X restore 25 390 pd help;
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#X text 7 24 Beating occurs when two signals are close together in
frequency. The constructive and destructive interference of their interaction
can be heard as rhythmic beating. This lab explores the frequency threshold
at which this beating becomes perceptible.;
#X text 5 123 Just Noticeable Difference (Questions 2-3);
#X text 7 5 Beating (Question 1);
#X text 5 142 Have you ever done the experiment in which you didn't
look and had someone poke you on your hand with two pins and moved
them closer together until it felt like you were being poked by one
pin \, rather than two? The closest together point at which you could
tell that there were two pins was the Just Noticeable Difference (JND)
for perceiving tactile sensation on your hand. If you repeat the process
on your back \, the JND is much larger (usually a couple of cm vs.
a couple of mm). Questions 2 and 3 have you measure your JND for amplitude
and frequency respectively.;
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