demo05_HandOut.DigitalTheorem

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Unformatted text preview: Fundamentals
of
Music
Technology
 Student
Handout
 Demo
5:
Digital
Theorem
 
 Goals:
To
observe
sampling
theorem
properties
and
artifacts
in
audio
and
visual
 media.
 
 This
demonstration
is
comprised
of
4
experiences:
 1. Continuous
vs
Discrete
 2. Quantization
and
Resolution
 3. Audio
Aliasing
 4. Strobe
&
Video
frame
rate
aliasing
 
 Experience
#1:
 Questions
for
the
Students:
 • Please
give
some
examples
of
something
continuous.
 • Please
give
some
examples
of
something
discrete.
 • What
is
the
difference
between
these
things?
 • Is
a
potentiometer
an
example
of
a
continuous
or
discrete
control?
 • Is
a
switch
an
example
of
a
continuous
or
discrete
control?
 
 Experience
#2:
 
Questions
for
the
Students:
 • What
positions
(values)
can
we
hit
with
the
fader
if
our
continuous
input
 signal
is
quantized
to
a
depth
of
2bits?
 • How
does
the
continuous
input
respond
to
noise?
 • How
does
the
discrete
input
respond
to
noise
when
quantized
to
a
resolution
 of
2
bits?
 
 Experience
#3:
 Questions
for
the
students:
 • What
is
the
definition
of
a
square
wave?
 • What
is
the
frequency
of
the
3rd
harmonic
of
a
square
wave
with
a
 fundamental
frequency
of
10kHz
 • What
will
happen
if
we
sample
this
square
wave
at
44.1kHz
 • Could
this
be
prevented?

If
so,
how?
If
not,
why?
 
 
 Experience
#4:
 Questions
for
the
students:
 • How
does
the
strobe
flashing
relate
to
sampling
an
audio
signal?
 • How
does
recording
a
frame
of
video
relate
to
sampling
and
audio
signal?
 • If
we
are
recording
at
30
frames
per
second,
while
rotating
an
object
at
16
 revolutions
per
second,
what
should
the
object
look
like
on
the
video?
 
 ...
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