通信英语(第四版)张筱华_石方文_北京邮电大学出版社[课后习题答案]VIP免费

1.PCM 原理 抽样量化与编码:sampling,quantizing and coding 话路:speech channel 幅值: amplitude value 抽样频率: sampling frequency 抽样速率: sampling rate 脉冲流: stream of pulses 重复率: repetition rate 编码过程: coding process 模拟信号: analog signal 传输质量: transmission quality 数字通信: digital communication 数字传输: digital transmission 含噪声的环境: noisy environment 传输路由: transmission path 信噪比 :signal-to-noise ratio 信号电平 :signal levels 噪声功率: noise power 地面系统: terrestrial system 二进制传输: binary transmission 反向操作: reverse operation 8-位码序列: 8-digit sequence 接受端: receiving terminal 帧格式 :frame format 同步字 :synchronization word 实现这三项功能的方案 :the schemes for performing these three functions 一串幅值: a series of amplitude values 电话质量的话路 a speech channel of telephone quality 一个8 位二进制码的序列: a sequence of 8-binary digits 理论上的最小抽样频率 :a minimum theoretical sampling frequency 占据着300Hz 到 3.4kHz 频率范围的话路: a voice channel occupying the range 300Hz to 3.4kHz 每个样值8-位码: 8-digits per sample value 汽车点火系统的打火: the sparking of a car ignition system 重复率为64kHz 的脉冲流: the stream of the pulses with a repetition rate of 64kHz 真实信号与噪声信号的关系: relationship of the true signal to the noise signal 由卫星上接受到的信号 :the signal received from a satellite 一条特定消息中的全部信息 :the complete informatian about a particular message 被传信号的波形 :the shape of the transmitted signal 由传输路由引入的衰减: the attenuation introduced by transmission path 将抽样的幅值转换成一串脉冲的单元 :the unit that converts sampled amplitude value to a set of pulses 涉及到第一路，第二路及其他各路的序列: a sequence relating to channel 1,2 and so on 被称为同步字的独特码序列: a unique sequ...