Casio CZ-1 Service Manual And Spare Parts List page 101

(1)
PD
(Phase Distortion)
Sound
Block
Music LSI
Two
LSIs generate digital
PD
sound
signals as
show
below.
Modt
NORMAL
TONE MIX
KEY
SPLIT
jiPD933AC-1 (Mastar)
Mix
TONE
1
LOW
jiP0933AC*2
(Slavt)
TONE
2
UPPER
.
Mixes
the
two
different digital signals
and
converts into
an
analog signal.
Music
LSIs'
outputs are
contracted to obtain
a
wide dynamic
range of amplitude.
Expander
circuit
reforms
it
into
a
proper
waveform.
Sample/Hold
Circuit
.
.
.
Removes a hiyh frequency noise
called as glitch
contained
in
the
DAC
output. Also separates the master
and
slave
waveforms.
(2)
After
Touch Block
After touch effect gives variation
of amplitude
and modulation
to
the output sound.
After
touch sensor under the keyboard
varies
its
resistance
from
infinity
to
approximately
lOohm by means
of pressure strength.
The
change
of the resistance
is
input to
Music
LSIs or
VAC
circuit via
main CPU.
The
CZ-1
is
able to set the
depth of the
effects
by
parameter
(0
-
15).
Afttf touch tfftct
F low of
af tar
touch
signal
Modulation Sarncr
m
Main
CPU
>• Music
LSIs
Amplitude
Stntor
w
Main
CPU
»
Aftar touch control
circuit
• VCA
circuit
(3)
Stereo
Chorus Block
Gives stereo effect
to the output sound.
ON/OFF
of stereo
effect
is
input by
panel switch.
The
stereo chorus
effect
can be
set individually
even
in
Tone Mix
or
Key
Split
mode.
Moda
Staraoaffact
ON/OFF
Tona mix Tonal: ON.
Tona
2:
OFF
Kay
split
LOW: OFF, UPPER:
ON
(4)
VCA
(Voltage Controlled Amplifier)
Receives voltage
which
are
converted from
the
resistance
value of
Main VR,
Foot
VR,
or
after
touch sensor.
In
accordance with the
voltage
level, this
block vary the amplitude of the sound.
DAC
(Digital to
Analog Converter)
Expander
Circuit