04202203赵伟毕业设计.docVIP

脉冲编码调制 【摘要】 脉冲编码调制是实现模拟信号数字化的最基本方法,包括取样,保持，量化和编码。经过脉冲编码调制,连续的模拟信号就可以用一定位数的二进制码表示。取样是建立在各种信号统计特性上的一种技术手段,把时间连续的信号变换为时间离散的信号,并保证取样后的样值幅度能完全表示原信号的全部信息。量化是对每个样值幅度进行离散化处理,即把状态连续的信号变换为状态离散的信号。量化分为均匀量化和非均匀量化,为减小量化误差,应增加量化级数和采用非均匀量化。编码是把量化后的信号转换为用二进制代码表示的PCM信号,常用的PCM编码码型有自然二进制码,折叠二进制码和循环码。 关键词：PCM 取样 量化 保持 编码 十三折线 Abstract：Pulse coding the system realizes emulation signal arithmetic figure the appearance s the most basic method, include to take the kind, and measure the appearance with code. Pass by the pulse to code the Change system, continuous emulation signal and then can use the certain the binary system code for number to mean. Take the kind to establish on the every kind of signal statistics the characteristic of signal transformation that a kind of technique means, continue time to time the long-lost signal, and guarantee to take the kind of the kind empress the worth range to can completely mean all informations of the original signals. Measuring the appearance to proceeds to worth range of each kind long- Lost appearance to handle, namely appearance signal transformation that continue is long- lost signal of appearance. Measure the appearance to is divided into the even deal appearance with not even deal appearance , for take effecting the deal appearance the error margin, should increase the deal appearance the series with adopt not even deal appearance. The PCM signal, code type of in common use PCM coding signal conversion that coding is all the deal appearance for meaning with binary system code have the nature binary system the codes, and fold the binary system code with the circulating code. Key words： PCM, take the kind, deal appearance , keeping, coding, thirteen fold line. 目录 1取样…………………………………………………………………………………4 1.1 取样过程………………………………………………………………………4 1.2 取样定理………………………………………………………………………5 2 保持 ………………………………………………………………………………7 3 量化 ………………………………………………………………………………8 3.1 均匀量化 ……………………………………………………………………10 3.2 非均匀量化 …………………………………………………………………11 3