Casio CZ-1 Service Manual And Spare Parts List page 116

21-6.
Compressor and
Expand*
Circuits
If a
sound
signal passes
through the
B8D,
a
noise
is
carried
on
the signal especially
when
the
input
level
of the
signal
is
low.
Compressor
B80
Expander
>
Compressor
.
When
the
level
of input
signal
is
low, the amplitude
is
large.
If
the input
level
is
high, the
amplitude
decreases.
Input Ltvtl
Expander
.
.
When
the
level
of input signla
is
low, the
amplitude
is
small.
The
amplitude
increases
when
the input
level
is
high.
Input Level
When
a
low
signal
does not
pass
through
the Compressor and
the
Expander;
Noise
When
a
low
signal passes
through
the
Compressor and
the
Expander;
\
N\J A/V
Compressor
BBO
*|
Expander
Noise
Thus, the S/N
ratio
of the
circuit
is
heightened.