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完美的英文信号与系统英文版答案

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2021-01-20 22:28
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hilary-完美的英文

2021年1月20日发(作者:yaoyuan)
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


class=txt>
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




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


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


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


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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