信号与系统第一章答案
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1-1画出下列各信号的波形【式中)()(t t t r ε=】为斜升函数。
(2)∞<<-∞=-t e t f t ,)( (3))()sin()(t t t f επ=
(4))(sin )(t t f ε= (5))(sin )(t r t f =
(7))(2)(k t f k ε= (10))(])1(1[)(k k f k ε-+= 解:各信号波形为
(2)∞<<-∞=-t e t f t ,)(
(3))()sin()(t t t f επ=
(4))(sin )(t t f ε=
(5))
f=
r
t
)
(sin
(t
(7))
t
=
(k
f kε
(
2
)
(10))
f kε
k
=
(k
+
-
(
(
]
)1
1[
)