文档介绍：English On munications Unit 01
The Principle of PCM
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Contents
Course introduction
Pre-reading Activities
While-reading Activities
New words and phrases
anization
Text and translation
Post-reading Activities
Further Development of the Theme-related Specialized Knowledge
Assignments
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Course Introductin
From this period on, we are going to learn English on munications, which is one of the English for Science and Technology (EST). (What‘s the characteristics of EST?)
Learning this course, we will
enlarge our vocabulary in the field of munications and information;
get familiar with the terms in it;
get to know the characteristics of writing style of munications English and
master the translation skills of it;
thus greatly improve our professional qualities petency in this globalized world in the information age.
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Pre-reading Activities
Ask the Ss the following two questions related to the theme of the text:
What is the heart of technology munications in today’s digital world?
Possible answers:
PCM.
Why PCM?
Possible answers:
The stream of pulses and non-pulse streams of 1’s and 0’s are not easily affected by interference and noise. Even in the presence of noise, the presence or absence of a pulse can be easily determined. Since PCM is digital, a more general reason would be that digital signals are easy to process by cheap standard techniques. This makes it easier to munication systems such as works (covered later in this course).
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While-reading Activities / New words and phrases
principle [‘prinsipl] n. 原理
sample [‘sæmpl] vt. 采样; 样值
quantize [‘kwɔntaiz] v. 量化,分层
scheme [ski: m] n. 方案,设计,安排
describe [dis‘kraib]vt. 叙述,描述
amplitude [‘æmplitju:d] n. 幅,幅度
binary [‘bainəri]a. 二进制的
minimum [‘miniməm]n.  最小值,最小量
theoretical [θiə‘retikəl] a.  理论上的
repetition [repi‘tiʃən]n.  重复,反复
maximum [‘mæksiməm]n.  最大值
reduce [ri: ‘dju:s]v.  减少,缩小
interchange [intə‘ʧeinʤ]v.  互换,转换
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While-reading Activities / New words and ph