北京邮电university通信英语教材.ppt

UNIT 1 UNIT 2 分词作定语 UNIT 3 插入语 倒装句 UNIT 4 要求后置定语的名词 单个分词作后置定语的情况 UNIT 5 不及物动词的名词化 及物动词的名词化 形容词作状语 介词短语作表语 * 同位语跟在所修饰的名词之后，可表示相同的事物或人，也可对该名词进行说明。同位语与所修饰的名词之间可以用各种标点符号隔开，这时同位语可以对标点符号前的整个句子进行说明。 PCM is dependent on three separate operations, sampling, quantizing, and coding. ＊ Substances fall into three groups: conductors, semiconductors and insulators. ＊ The laser is able to amplify light ? one unique property. ＊ (9 -4) can only be applied provided that the unsaturated gain coefficient exceeds the losses , a necessary requirement for oscillation. ＊ 这里列举了同位语位于句尾，修饰最后一个名词或整个句子的情况。还有其它的情况，课文中遇到时在讲。 介词短语 for doing something 作后置定语，表示目的，意思为用于?的。 Schemes for performing these three functions have evolved, and shall describe the main ones. ＊ algorithms for decoding received signals ＊ 这里的 ones 是代词, 避免重复。 ＊ A working equation expresses the unknown quantity in terms of the known ones. ＊ These equations are called differential equations, and now their study forms one of the most challenging branches of mathematics. ＊ We shall see how a speech channel be conveyed as a series of amplitude values, each value being represented as a sequence of 8 binary digits. 分词短语出现在句尾，用逗号隔开，表示伴随情况说明，非常常见。 ＊ 这时分词短语的逻辑主语经常省略。 ＊ 被省略的逻辑主语多数情况下指的是主句的主语或逗号前整个句子的含义，点也有少数列外。具体情况以后结合课文讲解。 ＊ It is ? that (which, when, who) ? 强调句型，如 ＊ It is the document that is very important. It was Faraday who first discovered electromagnetic induction. known as the signal-to-noise ratio 过去分词短语作后置定语，常见，译为 称之为?。 ＊ of the most interest to ?, 对?最感兴趣的 of interest = interesting of importance = important ＊ 名词＋逗号＋同位语+逗号 进行说明 An American, Edison, invented the first small electric lamp. ＊ g, the acceleration of gravity at the earth’s surface, has the value 32 ft/sec2. ＊ 正是数字传输为克服这种噪声环境提供了一种有力的方法。 数字传输正是对于克服这种噪声环境提供了一种有力的方法。 最高频率为3.4kHz的话音信号是用64kHz的信号来表示的，这是一个我们昨天所学的事实。 编码器是将采样幅值转换成一组脉冲的单元，它对数字传输是非常重要的。 编码的问题是一个极为重要的问题。 PCM这个术语是一个通信术语。 每采样值8位（码）的重复速率比4位的重复速率高。 话音信号是一个模拟信号，通过采样、量化和编码，我们可以实现话音信号的数字传输。 汉译英练习：（除第8