Pd (Phase Distortion) Sound Source - Casio CZ-1 Operation Manual

(7)
KEY TRANSPOSE
The
LCD
will
appear as
illustrated
below
when
the
KEY
TRANSPOSE
key
in
the
OVERALL CONTROL
SEC-
TION
is
ON.
(8)
SOLO
The
keyboard
of
the CZ-1
becomes
monophonic when
the
SOLO
key
is
ON, and
the
last
keyboard key pressed
is
given
priority.
KEV TRnNSPOSE
KEV=r:
'
—
Cursor
Each
press
of
the
VALUE
H
key
in
the
DATA ENTRY
SECTION
raises the
key by
one
semitone, while
each
press
of
the
key
lowers the
pitch
by
one
semitone.
SOLO
key
ON
Volume
':•'
KEY ON
KEY ON
® ®
KEY
ON
1
cut
when
KEY ON
2
starts
Initial
value
G^A^^A^B^^B^C-^C»-*D->E^-*E->
F—
SOLO
key
OFF
Volume*
KEY ON KEY ON
®
@
KEY
ON
1
continues
even
when
KEY ON
2
starts
(figure
shows
attenuating tones)
iM^iilljiB»ION)iS0UNDiSOllRCtE
»;r^^
The
CZ-1
employs a
unique,
CASIO
developed
PD
(Phase
Distortion)
sound
source system. This system
is
capable
of
producing a
variety of
wave
forms by
distorting
the read
phase
angles
of
sine
and
cosine
waves
that
are
written
in
ROM,
The
pattern
of
the read
phase
angle
distortion
is
determined by
the specification
of
the
DCO
(VCO
of
analog
synthesizer)
WAVE
FORM.
The
magnitude
(modulation depth)
of
the read angle
distortion
corresponds
to
the
momen-
tary
value
of
the
DOW
(VCF
of
analog
synthesizer) envelope.
(Fig- 1)
2;r
7^
y
K
'z(
\y^
Phase
angle
+
1
A
1
/ \
Waveform
u
-1
J
^
\J
V
Pol
exa
arity
(
+
/ -
mple.
-
)
cos^ reversed
for
sake
of
Fig.
1
illustrates
output
of
a
non-distorted cosine
wave
when
a
cosine
wave
in
ROM
is
read
with
a
linear
phase
angle.
The phase
angle
is
read
at
a constant speed
from
through
27r.
What
would happen
if
we
increase the phase
angle
read
speed
from through
tt
and decrease
it
from
-k
through
27r?
(Fig- 2)
-20