Amplitude suppressing apparatus and signal transmitting apparatus
An amplitude suppressing apparatus includes a differential circuit that calculates a differential value of amplitude of an input signal at a point when the amplitude reaches a predetermined threshold. The amplitude suppressing apparatus also includes an amplitude suppressing circuit that suppresses the amplitude of the input signal on the basis of the differential value calculated by the differential circuit.
1. A signal transmitting apparatus comprising:
an amplitude suppressing circuit that suppresses an amplitude of an input signal, without waiting for a peak of the amplitude of the input signal; and
a transmitting circuit that transmits a signal whose amplitude is suppressed by the amplitude suppressing circuit, wherein
the amplitude suppressing circuit performs suppression in accordance with an equation of:
y
(
t
)
=
(
x
(
t
)
A
1
x
(
t
)
-
x
(
t
)
A
2
x
(
t
)
)
×
1
α
x
(
t
)
′
+
1
+
x
(
t
)
A
2
x
(
t
)
(
x
(
t
)
>
A2
)
y
(
t
)
=
x
(
t
)
(
x
(
t
)
=
<
A2
)
,
where x(t) represents the amplitude of the input signal at time t, |x(t)|′ represents the first derivative of the absolute value of x(t) at time t, A 1 represents a suppression target value, A 2 represents a suppression start position, αrepresents a coefficient larger than 1, and y(t) represents an amplitude of a suppressed signal.