代码:

%% ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
%% Output Info about this m-file
fprintf('\n***********************************************************\n');
fprintf(' <DSP using MATLAB> Problem 7.10 \n\n'); banner();
%% ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ wp1 = 0.3*pi; ws1 = 0.4*pi; ws2 = 0.6*pi; wp2 = 0.7*pi;
As = 50; Rp = 0.2;
tr_width = min( ws1-wp1, wp2-ws2 );
M = ceil(6.6*pi/tr_width) + 1; % Hamming Window
fprintf('\nFilter Length is %d.\n', M); n = [0:1:M-1]; wc1 = (ws1+wp1)/2; wc2 = (wp2+ws2)/2; %wc = (ws + wp)/2, % ideal LPF cutoff frequency hd = ideal_lp(wc1, M) + ideal_lp(pi, M) - ideal_lp(wc2, M);
w_ham = (hamming(M))'; h = hd .* w_ham;
[db, mag, pha, grd, w] = freqz_m(h, [1]); delta_w = 2*pi/1000;
[Hr,ww,P,L] = ampl_res(h); Rp = -(min(db(1 : 1 : wp1/delta_w+1))); % Actual Passband Ripple
fprintf('\nActual Passband Ripple is %.4f dB.\n', Rp); As = -round(max(db(ws1/delta_w+1 : 1 : ws2/delta_w))); % Min Stopband attenuation
fprintf('\nMin Stopband attenuation is %.4f dB.\n', As); [delta1, delta2] = db2delta(Rp, As) %Plot figure('NumberTitle', 'off', 'Name', 'Problem 7.10 ideal_lp Method')
set(gcf,'Color','white'); subplot(2,2,1); stem(n, hd); axis([0 M-1 -0.2 0.8]); grid on;
xlabel('n'); ylabel('hd(n)'); title('Ideal Impulse Response');
subplot(2,2,2); stem(n, w_ham); axis([0 M-1 0 1.1]); grid on;
xlabel('n'); ylabel('w(n)'); title('Hamming Window');
subplot(2,2,3); stem(n, h); axis([0 M-1 -0.2 0.8]); grid on;
xlabel('n'); ylabel('h(n)'); title('Actual Impulse Response'); subplot(2,2,4); plot(w/pi, db); axis([0 1 -120 10]); grid on;
set(gca,'YTickMode','manual','YTick',[-90,-50,0]);
set(gca,'YTickLabelMode','manual','YTickLabel',['90';'50';' 0']);
set(gca,'XTickMode','manual','XTick',[0,0.3,0.4,0.6,0.7,1]);
xlabel('frequency in \pi units'); ylabel('Decibels'); title('Magnitude Response in dB'); figure('NumberTitle', 'off', 'Name', 'Problem 7.10 h(n) ideal_lp Method')
set(gcf,'Color','white'); subplot(2,2,1); plot(w/pi, db); grid on; axis([0 1 -120 10]);
set(gca,'YTickMode','manual','YTick',[-90,-50,0])
set(gca,'YTickLabelMode','manual','YTickLabel',['90';'50';' 0']);
set(gca,'XTickMode','manual','XTick',[0,0.3,0.4,0.6,0.7,1]);
xlabel('frequency in \pi units'); ylabel('Decibels'); title('Magnitude Response in dB'); subplot(2,2,3); plot(w/pi, mag); grid on; %axis([0 1 -100 10]);
xlabel('frequency in \pi units'); ylabel('Absolute'); title('Magnitude Response in absolute');
set(gca,'XTickMode','manual','XTick',[0,0.3,0.4,0.6,0.7,1,1.3,1.4,1.6,1.7,2]);
set(gca,'YTickMode','manual','YTick',[0,1.0]); subplot(2,2,2); plot(w/pi, pha); grid on; %axis([0 1 -100 10]);
xlabel('frequency in \pi units'); ylabel('Rad'); title('Phase Response in Radians');
subplot(2,2,4); plot(w/pi, grd*pi/180); grid on; %axis([0 1 -100 10]);
xlabel('frequency in \pi units'); ylabel('Rad'); title('Group Delay'); figure('NumberTitle', 'off', 'Name', 'Problem 7.10 h(n)')
set(gcf,'Color','white'); plot(ww/pi, Hr); grid on; %axis([0 1 -100 10]);
xlabel('frequency in \pi units'); ylabel('Hr'); title('Amplitude Response');
set(gca,'YTickMode','manual','YTick',[-0.0032, 0,0.0032, 0.9975, 1,1.0025]);
%set(gca,'YTickLabelMode','manual','YTickLabel',['90';'45';' 0']);
%set(gca,'XTickMode','manual','XTick',[0,0.2,0.35,0.55,0.75,1,1.2,1.35,1.55,1.75,2]);

  运行结果:

阻带最小衰减为50dB,满足设计要求。

用Hamming窗设计的滤波器脉冲响应,其幅度响应(dB和Absolute单位)、相位响应和群延迟响应。

振幅响应(Absolute单位)

通带部分

阻带部分

《DSP using MATLAB》Problem 7.10的更多相关文章

  1. 《DSP using MATLAB》Problem 6.10

    代码: %% ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ %% Output In ...

  2. 《DSP using MATLAB》Problem 5.10

    代码: 第1小题: %% ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ %% Out ...

  3. 《DSP using MATLAB》Problem 4.10

    今天擦完了玻璃,尽管有地方不那么明亮干净,冷风中瑟瑟发抖,年也快临近了. 代码是从网上找的, function [p, np, r, nr] = deconv_m(b, nb, a, na) % Mo ...

  4. 《DSP using MATLAB》Problem 3.10

    用到了三角窗脉冲序列,各小题的DTFT就不写公式了,直接画图(这里只贴长度M=10的情况). 1. 代码: %% ------------------------------------------- ...

  5. 《DSP using MATLAB》Problem 2.10

    代码: %% ------------------------------------------------------------------------ %% Output Info about ...

  6. 《DSP using MATLAB》Problem 8.10

    代码: %% ------------------------------------------------------------------------ %% Output Info about ...

  7. 《DSP using MATLAB》Problem 7.27

    代码: %% ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ %% Output In ...

  8. 《DSP using MATLAB》Problem 7.26

    注意:高通的线性相位FIR滤波器,不能是第2类,所以其长度必须为奇数.这里取M=31,过渡带里采样值抄书上的. 代码: %% +++++++++++++++++++++++++++++++++++++ ...

  9. 《DSP using MATLAB》Problem 7.25

    代码: %% ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ %% Output In ...

随机推荐

  1. 使用Flask部署机器学习模型

    Introduction A lot of Machine Learning (ML) projects, amateur and professional, start with an aplomb ...

  2. 【HNOI 2018】游戏

    Problem Description 一次小 \(G\) 和小 \(H\) 在玩寻宝游戏,有 \(n\) 个房间排成一列,编号为 \(1,2,-,n\),相邻房间之间都有 \(1\) 道门.其中一部 ...

  3. js在线富文本插件的考虑

    使用之前需要考虑的点: 1需要插件,是否需要很多的插件,还是说简单的那些功能就行了. 2界面考虑,看你喜欢那个界面了. 3图片是否需要上传图片服务器. 4文档如果为英文是否会影响开发. 5支持浏览器类 ...

  4. ssh远程登陆和MTR测试

    ssh -p 22 root@142.234.255.66 which mtr yum install mtr -y mtr -c 20 -n --report www.baidu.com mtr - ...

  5. haoop fs 命令

    Hadoop fs 命令详解   参考文档:https://hadoop.apache.org/docs/r2.7.1/hadoop-project-dist/hadoop-common/FileSy ...

  6. jar包安装到本地仓库

    mvn install:install-file -Dfile=hm_test.jar -DgroupId=com.TEST -DartifactId=hm_test -Dversion=1.0 -D ...

  7. Petrozavodsk Winter Camp, Andrew, 2014, Bipartite Bicolored Graphs

    由i个点和j个点组成的二分图个数为 $3^{ij}$,减去不联通的部分得到得到由i,j个点组成的联通二分图个数 $g_{i,j} = 3_{ij} - \sum_{k=1}^i \sum_{l=0}^ ...

  8. React文档(十六)refs和DOM

    Refs 提供了一种方式,用于访问在 render 方法中创建的 DOM 节点或 React 元素. 在标准的React数据流中,props是使得父组件和子组件之间交互的唯一方式.你通过props重新 ...

  9. vue实现tab切换功能

    最近用vue做一个页面的tab功能,经过一查找资料,没用路由,也没用动态组件,完美实现了tab切换功能,效果如下 下面是代码实现,这是模板 <article id="example&q ...

  10. .NET:bin 与 obj,Debug 与 Release ,区别与选择

    bin 与 obj bin 目录:用来存放编译的结果. ( bin是二进制binrary的英文缩写,因为最初C编译的程序文件都是二进制文件 ) 编译的结果,有 Debug 和 Release 两个版本 ...