XL1
AUDIO
GUIDE
Digital
Audio
Recording
CANON
DIGITAL
AUDIO
RECORDING
Canon’s
XL1
records
in
the
(relatively)
new
DV
format.
This
format
makes
for
greatly
expanded
audio
capabilities
because
of
its
use
of
Pulse
Code
Modulation
(PCM).
Æ
this
type
of
recording
differs
from
analogue
recording
where
sound
waves
are
recorded
as
changes
in
the
magnetic
field
on
the
tape.
Æ
with
digital
audio
recording,
sound
is
recorded
as
a
0
or
1,
which
is
then
converted
to
a
pulse
code.
[binary
vibe].
SOUND
WAVES
‐
Sound
waves
=
vibrations
in
the
air;
2
properties:
Æ
The
frequency
goes
from
bass
(low)
to
treble
(high)
and
refers
to
the
number
of
times
per
second
the
wave
goes
through
a
cycle.
The
more
cycles
per
second,
the
higher
the
frequency
Æ
The
amplitude
goes
from
soft
to
loud
and
refers
to
the
swing
of
the
curve.
The
further
the
curve
swings
above
or
below
the
centre
line,
the
louder
the
signal.
[together
frequency
+
amplitude
make
up
the
sine
wave]
‐
The
average
ear
processes
20
(20Hz)
to
20
000
cycles
per
second.
Æ
the
wavelength
becomes
shorter
as
the
frequency
rises
HOW
THE
CAMERA
PROCESSES
DIGITAL
SOUND
Æ
Æ
analogue
signal
Æ
A/D
Converter
Sound
Camera
mic
The
camera
picks
up
an
analogue
signal
and
uses
an
Analogue
‐
to
‐
Digital
(A/D)
converter.
For
playback,
the
sound
is
processed
through
a
Digital
‐
to
‐
Analogue
(D/A)
converter.
QUALITY
‐
Digital
systems
measure
in
steps,
but
the
analogue
signals
they’re
measuring
are
continuous.
Summary of Contents for XL1 3CCD
Page 54: ......
