Casio CZ-1 User Manual

As shown in Fig.
2,
the phase
angle read is distorted
rather
than linear,
and the
output cosine wave
takes
on
what
is close
to a saw-tooth pattern.
What would happen
now if
we
further
increase
the
phase
angle
read
speed
from
through
tt
and
decrease
it from X through
2x7
(Fig.
3)
(Fig.
4)
Fig.
3
shows that
the
output cosine wave
is almost
a
perfect
saw-tooth
pattern.
The
revolutionary
PD sound
source
system thus makes
it
possible
to output
waveforms
that differ from
cosine
waves
by simply
distorting
the
cosine (or sine) wave
read
from
ROM.
Figs.
1 through
3
illustrate
the patterns
produced
by
increasing
the phase
angle
read
speed
from
through
X
while
decreasing the
speed from
x
through
2x.
This
is
the
pattern
effected when
the SAW-TOOTH
wave-
form
is selected
in
the DCO
parameter.
Read
phase angles
are also
distorted in accordance
with
the
selection
of the other
DCO parameter
WAVE
FORMS,
thus making
a
variety
of waveform
outputs
possible.
The
magnitude
of the
read phase angle distortion cor-
responds
to the
momentary value
(change
over
time)
of
the
DCW
envelope.
When the DCW
envelope is
set
as
shown
in Fig.
4,
an
undistorted cosine wave is
out-
put
at
point
@
,
distortion reaches its
peak at point
©
,
and
a
saw-tooth pattern
as shown in Fig.
3 is output.
Distortion
is reduced
(modulation becomes shallower)
at
point
Cb)
,
and
a
pattern
that
is
somewhere between
a
cosine
wave
and a saw-tooth
wave
as
illustrated
in
Fig.
2
is
output.
rw33
©
•A
^
DCW envelope
AA
/ l\
^
\
t
Key ON
Key OFF
When WAVE
FORM
is
set to saw-tooth.
®
AA
^^^^^U^^^^
®
^mm
1)
The
pattern
of the
read
phase
angle
distortion
corresponds to the WAVE FORM setting
of
the
DCO parameter.
2)
The
magnitude
of the read output
phase an-
gle
distortion (modulation
depth) corresponds
to the
momentary
value of the
DCW
envelope.
-21-

Casio CZ-1 Specifications

General

Brand	Casio
Model	CZ-1
Category	Synthesizer
Language	English