(完整版)电子信息与通信工程专业英语期末必考翻译

1。"In most cases, these signals originate as sensory data from the real world：seismic vibrations visual images， sound waves， etc。

DSP isthe mathematics，the algorithms, and the techniques used to manipulate these signals after they have been converted into a digital form.”在大多数情况下，这些信号来源于人对真实世界的感觉，比如地震的震动，视觉图像,声音波形等。数字信号处理是一种数学工具,是一种用来处理那些将上述信号转换成数字形式后的信号的算法和技术.

2.Fourier’s representation of functionsas a superposition of sines and cosines has become Ubiquitous for both the analytic and numerical solution of differential equations and for the analysis and treatment of communication signals 函数的傅里叶表示,即将函数表示成正弦和余弦信号的叠加，这种方法已经广泛用于微分方程的解析法和数值法求解过程以及通信信号的分析和处理。3。If f （t ） is a nonperiodic signal, the summation of the periodic functions ,such as sine and cosine, does not accurately represent the signal. You could

artificially extend the

signal to make it periodic

but it would require

additional continuity at the end

points . 如果f(t)是非周期信

号，那么用周期函数例如正弦和余弦

的和，并不能精确的表示该信号f(t).

你可以人为的拓展这个信号使其具

有周期性，但是这要求在端点处附加

连续性

4。 A digital filter is a

mathematical algorithm

implemented in hardware,

firmware, and software that

operates on a digital input

signal to produce a digital

output signal for achieving

filtering objectives。数字

滤波器是一种数学算法，它可以用硬

件，固件和软件来实现。它作用于数

字输入信号产生数字输出信号从而

达到滤波目标。

5。The basic idea of Fourier

series method is to design an

FIR filter that approximates the

desired frequency response of

filter by calculating its impulse

response. "用傅里叶级数设计FIR

滤波器的基本的理念是计算出此滤

波器的单位冲激响应来逼近所期望

的滤波器的频率响应。

"

6."If the signal has sharp

transitions, it is necessary to

window the

input data, so that the sections

converge to zero at the

endpoints”如果信号有急剧的

过渡，就有必有对输入信号加窗，这

样信号在端点处就会收敛于零.

7.”The concepts of signal

s and systems arise in a

wide

variety of fields, and the

ideas and techniques assoc

iated

with these concepts play an

important role in such di

verse

areas of science and techno

logy as communication，

aeronautics and astronautic

s, circuit design, acoustics

，

seismology，biomedical eng

ineering，energy generation

distribution systems, chemica

l process control，and spe

ech

processing。”信号与系统的

概念出现在广阔的范围内，在科学技

术的不同领域，如通信、航空航天、

电路设计、声学、地震学、生物学、

生物医学工程、发电和输电系统、化

学过程控制和语音处理中都离不开

这个概念的思想与技术。它在科学技

术中发挥了重要作用。

8。

" Without some restrictions

，when the

characterization of a system

requires a complete input

—

out-put relationship，knowin

g the output of a system

to a certain set of input

doe not allow us to dete

rmine the output of the sy

stem to other sets of inpu

ts。”当系统的特性描述要求完整

的输入输出关系时，如果没有约束条

件，即使知道了系统对某些特定输

入产生的输出时,我们也并不知道系

统对其他输入产生的输出。

9。

An example of a finite-ener

gy signal is a signal that

takes on the value 1 for

0≤t≤1 and 0 otherwise。

举一个有限能量信号的例子：信

号在0≤t≤1,而在其他时间范围取

值为0。

10.This，of course，makes

sense, since if there is

a nonzero average energy