hilary-完美的英文
信号与系统英文版答案
【篇一:信号与系统
signal and system
英文版往年考
试题
1
】
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参考答案
i. blank filling (total scores 60, each scores 5. ) 1
、
1
f(0)
(
70
%)
a
2
、
?1/2
(
96
%)
3
、
?e?tu(t)??(t)
(
92
%)
4
、
piecewise function can be comprised by rectangular
window functions(
可以用矩形窗函数构造分段函数
). consider a
signalf(t)?t[u(t)?u(t?1)]
,
the even component of f(t) is fe(t)
=
,
the odd component of f(t) is
fo(t)
=
t
[2u(t)?u(t?1)?u(t?1)]
(
46
%)
2
t
[u(t?1)?u(t?1)]
(
92
%)
2
5
、
consider a signal e(t)?t[u(t)?u(t?1)]
,
and
h(t)?e?t[u(t)?u(t?1)]
,
so e(t)*h(t)?
。
(express your answer by rectangular window function like
i.4)
先做微分
?t?1?e?t
,0?t?1?
y(t)??e?1(2?t),1?t?2
?0,
其他
?
(
76
%)
6
、
necessary and sufficient conditions for stability of the
system
is
its
impulse
?
response
h(t)
should be
【
int(f(x),-inf,inf)
=
???f(x)dx
】
?
?
??
h(t)dt??
(
37
%)
7
、
consider a signal e(t)?u(t)?u(t?1)
,则
e(t)*e(t)? (express
your answer by rectangular window function like i.4)
t[u(t)?u(t?1)]?(2?t)[u(t?1)?u(t?2)]
(
87
%)
?t,0?t?1
?
?2?t,1?t?2?0,others?
8
、
known fourier transform of f(t) is f(j?)
,
so the fourier
transform of f(4?t)
e?j4?f(?j?)
(
71
%)
9
、
the fourier transform of ej2t?(t) is ?(t)?1?(t)?j?
ej2t?(t)?j(??2)
(
83
%)
10
、
a system s with input x[n] and output y[n] related by
y[n]?x[n]{g[n]?g[n?2]} is time invariant while
g[n]constant
(
6
%)
11
、
x(t)??(t?t)??(t?t),y(t)????x(?)d?, thene? of
t
y(t)
2t
(
73
%)
ii. single choice(total scores 24, each scores 6. )
equivalent expression of ?(t2?4) is ( d )
1
a
:
?(t?2)
2
b
:
[?(t?2)
+
?(t?2)]d
:
[? (t?2)
+
?(t?2)]
????????(t)dt?1
?
???(t)?0(t?0)
1
2
1
c
:
?(t?2)
414
2. refer to the fourier transform of determine
x(t)?eu(t), to
?at
f(t) when the fourier transform of f(t) is
f(t) is ( b )
b
:
e?(5?j2)tu(t) d
:
e?(5?j2)t
1
, then
5?j(??2)
a
:
e?(5?j2)tu(t) c
:
e?(5?j2)t
1
eu(t)?
a?j?
?at
input e(t) and output r(t) of a continuous system is
regulated by r(t)=e(t+2), then the system is ( d ) a
:
causal,
time-variant, linear, stable
b
:
causal, time-invariant, nonlinear, unstable c
:
non-causal,
time-variant, linear, stable d
:
non- causal, time-invariant,
linear, stable
input f(t) and output r(t) of a system is governed by
r(t)??f(?)e?d?, then the system is ( b )
a: linear and time- invariant system b: linear and time-variant
system c: nonlinear and time-invariant system d: nonlinear
and time-variant system
iii. true or false. (total score 16, each scores 2.) system
input isx(t), then the systemlinear.
t
h[n]?k(for any n), and k is a known constant, then the lti
system with unit impulse response h[n] is stable.
f
fourier transform of real even signal is also a real even
function.
t
any system, the impulse response completely describes
y(t)?tx(t) is
its behavior.
f
h(t) is the unit impulse response of a lti system, and h(t) is
periodic and non-zero, then the system is unstable.
t
summation of two periodic signals is also a periodic
signal.
f
system must be causal.
f
8. the fourier transform of a real odd signal is a purely
imaginary and odd function of frequency.
t
【篇二:《信号与系统》信号术语中英文对照】
ly integrable
absolutely integrable impulse response absolutely summable
absolutely summable impulse response accumulator acoustic
adder
additivity property aliasing all-pass systems
am (amplitude modulation ) amplifier
amplitude modulation (am) amplitude-scaling factor
analog-to-digital (a-to-d) converter analysis equation
angel (phase) of complex number angle criterion angle
modulation anticausality
绝对可积
绝对可积冲激响应
绝对可和
绝对可和冲激响应
累加器
声
学
加法器
可加性
混叠现象
全通系统
幅度调制
放大器
幅度调制
幅
度放大因子
模数转换器
分析公式(方程)
复数的角度(相位)角判
据
角度调制
反因果
aperiodic
aperiodic convolution aperiodic signal asynchronous audio
systems
autocorrelation functions automobile suspension system
averaging system
b
band-limited
band-limited input signals band-limited interpolation
bandpass filters bandpass signal
bandpass-sampling techniques bandwidth
bartlett (triangular) window bilateral laplace transform bilinear
bilinear transformation bit
非周期
非周期卷积
非周期信号
异步的
音频(声音)系统
自相关函数
汽车减震系统
平滑系统
带(宽)限的
带限输入信号
带限内插
带通滤波器
带通信号
带通采
样技术
带宽
巴特利特(三角形)窗双边拉普拉斯变换
双线性的
双线性变换
(二进制)位,比特
block diagrams bode plots bounded break frequency
butterworth filters
c
“chirp” transform algorithm capacitor carrier
carrier frequency carrier signal
cartesian (rectangular) form cascade (series) interconnection
cascade-form causal lti system channel
channel equalization chopper amplifier closed-loop closed-
loop poles closed-loop system
方框图
波特图
有界限的
折转频率
巴特沃斯滤波器
“
鸟声
”
变换算法
电容器
载波
载波频率
载波信号
直角坐标形式
串联,
级联
串联形式
因果的线性时不变系统信道,频道
信道均衡
斩波器放大器
闭环
闭
环极点
闭环系统
closed-loop system function coefficient multiplier coefficients
communications systems commutative property
compensation for nonideal elements complex conjugate
complex exponential carrier complex exponential signals
complex exponential(s) complex numbers conditionally stable
systems conjugate symmetry conjugation property
continuous-time delay continuous-time filter continuous-time
fourier series continuous-time fourier transform continuous-
time signals continuous-time systems
continuous-to- discrete-time conversion
闭环系统函数
系数乘法器
系数
通信系统
交换性(交换律)
非理想
元件的补偿
复数共轭
复指数载波
复指数信号
复指数
复数
条件稳定
系统
共轭对称
共轭性质
连续时间延迟
连续时间滤波器
连续时间傅
立叶级数
连续时间傅立叶变换
连续时间信号
连续时间系统
连续时间到离散时间转换
convergence convolution convolution integral convolution
property convolution sum correlation function critically
damped systems crosss-correlation functions cutoff
frequencies
d
damped sinusoids damping ratio dc offset dc sequence
deadbeat feedback systems decibels (db) decimation
decimation and interpolation degenerative (negative) feedback
delay delay time
收敛
卷积
卷积积分
卷积性质
卷积和
相关函数
临界阻尼系统
互相
关函数
截至频率
阻尼正弦振荡
阻尼系数
直流偏移
直流序列
临界阻尼反馈系统分贝
抽取
抽取和内插
负反馈
延迟
延迟时间
【篇三:信号与系统答案】
)
?
(
2
)
?
(
5
)
?
??
f(t?t0)?(t?t0)dt
(
3
)
?
2
et?(t?3)dt
?4
?
e?tsint?(t?1)dt
d?t
[e?(t)] dt
(
6
)
?
??
t0??dt2?
?
??
f(t?t0)?(t)dt
(
7
)
?
?
??
f(t0?t)?(t)dt
t
hilary-完美的英文
hilary-完美的英文
hilary-完美的英文
hilary-完美的英文
hilary-完美的英文
hilary-完美的英文
hilary-完美的英文
hilary-完美的英文
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