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matlab声音信号处理频率图信号过滤和播放声音

2022-07-22 21:45:00 【studyer_domi】

1、内容简介

略
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2、内容说明

略

3、仿真分析

clear;
clc;
close all
%mini project
[x,fs] = audioread('mini_proj.wav');
x = x(:,1)';
N = length(x);
n = 0:N-1;
L = N/fs;
fprintf('the length is %ds\n',L);
fprintf('the fs is %dHz\n',fs);
figure
plot(x);

[fx,x0]=change_fft(fs,x);
figure
plot(fx,x0)
sound(x,fs)
pause(4)
%% 
lpFilt = designfilt('lowpassiir','FilterOrder',5, ...
         'PassbandFrequency',2e2,'PassbandRipple',0.01, ...
         'SampleRate',fs);

[b,a]=tf(lpFilt)
y = filter(b,a,x);
sound(y,fs);%回放滤波移频后的声音
[fy,y0]=change_fft(fs,y);
figure
plot(fy,y0)
sound(y,fs)