Casio CZ-1 - 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.