大学二手市场电子信息工程毕业论文范文-电子信息工程专业论文怎么写

滤波器系数进行灵活的修改，

以实现任意阶数的

IIR

滤

波器。因此，该设计方法可靠性好，效率高，极大的减轻了工作量，

关键词

带通滤波器；

FIR

；

Matlab

仿真

;

Abstract

This paper analyzes the situation of application and development of digital filter

technology

home

and

abroad.

It

introduces

the

basic

structure

of

a

digital

filter,

discusses

different

design

methods

of

FIR

and

IIR

filter,

and

points

out

that

the

traditional

design

method

of

digital

filter

is

not

only

complex

but

also

of

heavy

workload, even adjustment of filtering parametrer is very difficult. So it brings forwad

another

design

method

of

digital

filter

which

based

on

the

Matlab

software

and

Modelsim

software.

This

paper

introduces

the

design

method

of

a

high

Q

value

band- pass IIR filter which meets the given standard -- the pass band is 45-55Hz, with

attenuation of less than 3db; the stop band is 40-60Hz with attenuation greater than

80db. It deeply analyzes the design features and principles of the filter system and the

key

technical

in

the

design.

Then

it

describs

the

use

of

Matlab

in

design

and

simulation of the bandpass

filte

design.

In the end,

the procedure was

simulated on

Modelsim. Simulation results of Modelsim and Matlab compared to make proof of the

accuracy of the design. It is proved that the design can be accurate at the sixth decimal

place, stable error is within one ten thousandth; The design has good portability and

widely

practical

application.

In

different

applications,

according

to

different

performance requirements of order, speed and accuracy, etc, the IIR filter coefficients

can

change

flexibly

to

make

up

of

IIR

filter

of

arbitrary

order;

In

addition,

VHDL

procedure

can

also

make

certain

optimizations,

according

to

the

different

actual

situation, to achieve greater speed or conservation of

FPGA resources.

Key words

digital filter

FIR

Matlab simulation

第

1

章

概述

1.1

数字滤波器

数字滤波器 一词出现在

60

年代中期。由于电子计算机技术和大

规模 集成电路的发展，

数字滤波器已可用计算机软件实现，

也可用大

< br>规模集成数字硬件实时实现。

数字滤波器是对数字信号进行滤波处理

以得到期望的响应特性的离散时间系统。

作为一种电子滤波器，

数字

数位滤波器工作

在数字信号域，

它处理的对象是经由采样器件将模拟信号转换而得到

的数字信号。

数字滤波器

(digital

filter)

是指输入输出均为数字信号，通过

一定运算关 系改变输入信号所含频率成分的相对比例或者滤除某些

频率成分的器件。

它工作在数字信号域，

它处理的对象是经由采样器

件将模拟信号转换而得 到的数字信号。

数字滤波器一般由寄存器、

延

时器、加法 器和乘法器等基本数字电路实现。

带通滤波器是指能通过某一频率范围 内的频率分量、但将其

他范围的频率分量衰减到极低水平的滤波器，与带阻滤波器的概< /p>

念相对。一个模拟带通滤波器的例子是电阻

-

电感