1 简介
结合数字滤波器的理论基础和设计方法,在MATLAB程序语言环境下,设计出有限长单位脉冲响应(FIR)数字滤波器,同时利用GUI界面设计FIR数字滤波器人机交互平台,该系统平台界面直观、操作简单且功能齐全,可实现对加噪语音信号的去噪滤波功能.平台主要包括语音信号、加噪信号、FIR数字滤波器设计和去噪信号四个模块,用户可根据读入的语音信号及噪声信号特点调整滤波器技术指标,实现滤波器的优化设计,最终达到FIR数字滤波器对语音信号的去噪处理效果.
2 部分代码
function varargout = yanshou(varargin)
% YANSHOU M-file for yanshou.fig
% YANSHOU, by itself, creates a new YANSHOU or raises the existing
% singleton*.
%
% H = YANSHOU returns the handle to a new YANSHOU or the handle to
% the existing singleton*.
%
% YANSHOU('CALLBACK',hObject,eventData,handles,...) calls the local
% function named CALLBACK in YANSHOU.M with the given input arguments.
%
% YANSHOU('Property','Value',...) creates a new YANSHOU or raises the
% existing singleton*. Starting from the left, property value pairs are
% applied to the GUI before yanshou_OpeningFcn gets called. An
% unrecognized property name or invalid value makes property application
% stop. All inputs are passed to yanshou_OpeningFcn via varargin.
%
% *See GUI Options on GUIDE's Tools menu. Choose "GUI allows only one
% instance to run (singleton)".
%
% See also: GUIDE, GUIDATA, GUIHANDLES
% Edit the above text to modify the response to help yanshou
% Last Modified by GUIDE v2.5 23-Apr-2020 14:20:34
% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name', mfilename, ...
'gui_Singleton', gui_Singleton, ...
'gui_OpeningFcn', @yanshou_OpeningFcn, ...
'gui_OutputFcn', @yanshou_OutputFcn, ...
'gui_LayoutFcn', [] , ...
'gui_Callback', []);
if nargin && ischar(varargin{1})
gui_State.gui_Callback = str2func(varargin{1});
plot(w/pi*Fs/2,20*log(abs(h)));
x1=fftfilt(b2,x1);
elseif get(handles.radiobutton6,'value')
b2=fir1(30, [fp/Fs fs/Fs],'stop', triang(31));
axes(handles.axes3);
[h,w]=freqz(b2, 1,512);
plot(w/pi*Fs/2,20*log(abs(h)));
x1=fftfilt(b2,x1);
elseif get(handles.radiobutton7,'value')
b2=fir1(30, [fp/Fs fs/Fs], 'stop',hanning(31));
axes(handles.axes3);
[h,w]=freqz(b2, 1,512);
plot(w/pi*Fs/2,20*log(abs(h)));
x1=fftfilt(b2,x1);
elseif get(handles.radiobutton8,'value')
b2=fir1(30, [fp/Fs fs/Fs], 'stop',blackman(31));
axes(handles.axes3);
[h,w]=freqz(b2, 1,512);
plot(w/pi*Fs/2,20*log(abs(h)));
x1=fftfilt(b2,x1);
elseif get(handles.radiobutton9,'value')
b2=fir1(30, [fp/Fs fs/Fs],'stop',kaiser(31));
axes(handles.axes3);
[h,w]=freqz(b2, 1,512);
plot(w/pi*Fs/2,20*log(abs(h)));
x1=fftfilt(b2,x1);
end;
axes(handles.axes5);
plot(tl,x1);
title('滤除噪声后语音时域波形');
xlabel('时间/s');
N=length(x1);
df=Fs/N;
w=[0:df:df*(N-1)] - Fs/2; %频率尺度
X=fft(x1);
X=fftshift(X);
axes(handles.axes6);
plot(w,abs(X)/max(abs(X)));
axis([-10000,10000,0,1]);
title('滤除噪声后语音频谱');
xlabel('频率/Hz');
grid on;
x2=x1;
% --- Executes on button press in radiobutton1.
function radiobutton1_Callback(hObject, eventdata, handles)
% hObject handle to radiobutton1 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% Hint: get(hObject,'Value') returns toggle state of radiobutton1
% --- Executes on button press in radiobutton2.
function radiobutton2_Callback(hObject, eventdata, handles)
% hObject handle to radiobutton2 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% Hint: get(hObject,'Value') returns toggle state of radiobutton2
% --- Executes on button press in invert_pushbutton12.
function invert_pushbutton12_Callback(hObject, eventdata, handles)
% hObject handle to invert_pushbutton12 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
global x;
global x2;
N=length(x);
for i=1:1:N
x2(i)= x(N-i+1);
end;
case 1
建一个不可见的figure
new_axes=copyobj(handles.axes5,new_f_handle); %axes1是GUI界面内要保存图线的Tag，将其copy到不可见的figure中
set(new_axes,'Units','normalized','Position',[0.1 0.1 0.8 0.8]);%将图线缩放
[filename pathname fileindex]=uiputfile({'*.png';'*.bmp';'*.jpg';'*.eps';},'图片保存为');
if filename~=0%未点“取消”按钮或未关闭
file=strcat(pathname,filename);
switch fileindex %根据不同的选择保存为不同的类型
case 1
print(new_f_handle,'-dpng',file);% print(new_f_handle,'-dpng',filename);效果一样，将图像打印到指定文件中
fprintf('>>已保存到：%s\n',file);
case 2
print(new_f_handle,'-dbmp',file);
fprintf('>>已保存到：%s\n',file);
case 3
print(new_f_handle,'-djpeg',file);
fprintf('>>已保存到：%s\n',file);
case 4
print(new_f_handle,'-depsc',file);
fprintf('>>已保存到：%s\n',file);
end
msgbox(' 图线已成功保存！','完成！');
end
new_f_handle=figure('visible','off'); %新建一个不可见的figure
new_axes=copyobj(handles.axes6,new_f_handle); %axes1是GUI界面内要保存图线的Tag，将其copy到不可见的figure中
set(new_axes,'Units','normalized','Position',[0.1 0.1 0.8 0.8]);%将图线缩放
[filename pathname fileindex]=uiputfile({'*.png';'*.bmp';'*.jpg';'*.eps';},'图片保存为');
if filename~=0%未点“取消”按钮或未关闭
file=strcat(pathname,filename);
switch fileindex %根据不同的选择保存为不同的类型
case 1
print(new_f_handle,'-dpng',file);% print(new_f_handle,'-dpng',filename);效果一样，将图像打印到指定文件中
fprintf('>>已保存到：%s\n',file);
case 2
print(new_f_handle,'-dbmp',file);
fprintf('>>已保存到：%s\n',file);
case 3
print(new_f_handle,'-djpeg',file);
fprintf('>>已保存到：%s\n',file);
case 4
print(new_f_handle,'-depsc',file);
fprintf('>>已保存到：%s\n',file);
end
msgbox(' 图线已成功保存！','完成！');
end
3 仿真结果
4 参考文献
[1]冯浩. 基于MATLAB GUI的FIR数字滤波器语音信号去噪处理[J]. 菏泽学院学报, 2016, 38(5):5.
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