1、基带 一条电缆只用于一个信道,50Ω,用于数字传输 2、宽带一条电缆同时传输不同频率的几路模拟信号,75Ω,用于模拟传输,300-450MHz,100km,需要放大器

概述 现实的对象参数多为模拟信号: 利用计算机进行信息处理,必须将其转成数字信号

5.1 Digital Processing of Continuous-Time Signals Digital processing of a continuous-time signal involves the following basic steps: (1) Conversion of the continuous-time signal into discrete-time signal, ()Processing of the discrete-time signal, (3) Conversion of the processed discrete- time signal back into a continuous-time signal

Objective-Determination- of realizable transfer function G() approximating a given frequency response specification is an important step in the development of a digital filter If an IIR filter is desired, G() should be a stable real rational function Digital filter design is the process of deriving the transfer function G

Digital Signal Processing Theory, method, algorithm Digital Signal Processor A kind of microprocessor used to implement digital signal processing algorithm

2.1 Discrete-Time Signals: Time-Domain Representation Signals represented as sequences of numbers, called samples Sample value of a typical signal or sequence denoted as x[n] with n being an integer in the range-oo≤n≤∞ x[n] defined only for integer values of n and undefined for noninteger values of n Discrete-time signal represented by {x[n]}

实验2离散系统的差分方程、冲激响应和卷积分析 实验目的:加深对离散系统的差分方程冲激响应和卷积分析方法 的理解。 实验原理:离散系统

实验6FFT算法的应用 实验目的:加深对离散信号的DFT的理解及其FFT算法的运用。 实验原理:N点序列的DFT和IDFT变换定义式如下: n=0 N k=0 利用旋转因子W=e具有周期性,可以得到快速算法 (FFT)。 在 MATLAB中,可以用函数x=fft(x,n)和=ifft(N)计算 N点序列的DFT正、反变换。 实验内容:

4.4协方差和相关系数 问题对于二维随机变量(,): 已知联合分布 边缘分布 对二维随机变量除每个随机变量各自 的概率特性外,相互之间可能还有某种联系 问题是用一个怎样的数去反映这种联系 数 反映了随机变量X,Y之间的某种关系

Binary Code Natural Binary Coded Decimal (BCD) Decimal BCD group of four binary digits represent 0000 a single decimal digit