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【滤波器】基于汉宁窗FIR滤波器实现语音信号加噪去噪含Matlab源码

来源：互联网收集：自由互联发布时间：2022-06-18

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、

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 = filter_config(varargin)
% FILTER_CONFIG M-file for filter_config.fig
% FILTER_CONFIG, by itself, creates a new FILTER_CONFIG or raises the existing
% singleton*.
%
% H = FILTER_CONFIG returns the handle to a new FILTER_CONFIG or the handle to
% the existing singleton*.
%
% FILTER_CONFIG('CALLBACK',hObject,eventData,handles,...) calls the local
% function named CALLBACK in FILTER_CONFIG.M with the given input arguments.
%
% FILTER_CONFIG('Property','Value',...) creates a new FILTER_CONFIG or raises the
% existing singleton*. Starting from the left, property value pairs are
% applied to the GUI before filter_config_OpeningFcn gets called. An
% unrecognized property name or invalid value makes property application
% stop. All inputs are passed to filter_config_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 filter_config
% Last Modified by GUIDE v2.5 20-Nov-2012 22:45:50
% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name', mfilename, ...
'gui_Singleton', gui_Singleton, ...
'gui_OpeningFcn', @filter_config_OpeningFcn, ...
'gui_OutputFcn', @filter_config_OutputFcn, ...
'gui_LayoutFcn', [] , ...
'gui_Callback', []);
if nargin && ischar(varargin{1})
gui_State.gui_Callback = str2func(varargin{1});
end
if nargout
[varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
else
gui_mainfcn(gui_State, varargin{:});
end
% End initialization code - DO NOT EDIT
% --- Executes just before filter_config is made visible.
function filter_config_OpeningFcn(hObject, eventdata, handles, varargin)
% This function has no output args, see OutputFcn.
% hObject handle to figure
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% varargin command line arguments to filter_config (see VARARGIN)
% Choose default command line output for filter_config
handles.output = hObject;
% Update handles structure
guidata(hObject, handles);
% UIWAIT makes filter_config wait for user response (see UIRESUME)
% uiwait(handles.panal1);
% --- Outputs from this function are returned to the command line.
function varargout = filter_config_OutputFcn(hObject, eventdata, handles)
% varargout cell array for returning output args (see VARARGOUT);
% hObject handle to figure
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% Get default command line output from handles structure
varargout{1} = handles.output;
axes(handles.axes1);
plot(20*log10(abs(fft(bs))));
axis([0 3*Wn -inf inf]);
axes(handles.axes2);
plot(angle(fft(bs)));
axis([-inf inf -inf inf]);
setappdata(handles.panal1,'bl1',bl1);
setappdata(handles.panal1,'bl2',bl2);
setappdata(handles.panal1,'bf_window',bf_window);
setappdata(handles.panal1,'bh',bh);
setappdata(handles.panal1,'bs',bs);
setappdata(handles.panal1,'Wn',Wn);
setappdata(0,'bs',bs);
setappdata(0,'bh',bh);
setappdata(0,'bl1',bl1);
% --- Executes on button press in pushbutton2.
function pushbutton2_Callback(hObject, eventdata, handles)
% hObject handle to pushbutton2 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% --- Executes on button press in close.
function close_Callback(hObject, eventdata, handles)
% hObject handle to close (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
clc;
close filter_config;
function Wn_Callback(hObject, eventdata, handles)
% hObject handle to Wn (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% Hints: get(hObject,'String') returns contents of Wn as text
% str2double(get(hObject,'String')) returns contents of Wn as a double
% --- Executes during object creation, after setting all properties.
function Wn_CreateFcn(hObject, eventdata, handles)
% hObject handle to Wn (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles empty - handles not created until after all CreateFcns called
% Hint: edit controls usually have a white background on Windows.
% See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
set(hObject,'BackgroundColor','white');
end
function band_Callback(hObject, eventdata, handles)
% hObject handle to band (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% Hints: get(hObject,'String') returns contents of band as text
% str2double(get(hObject,'String')) returns contents of band as a double
% --- Executes during object creation, after setting all properties.
function band_CreateFcn(hObject, eventdata, handles)
% hObject handle to band (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles empty - handles not created until after all CreateFcns called
% Hint: edit controls usually have a white background on Windows.
% See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
set(hObject,'BackgroundColor','white');
end
function Wdel_Callback(hObject, eventdata, handles)
% hObject handle to Wdel (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% Hints: get(hObject,'String') returns contents of Wdel as text
% str2double(get(hObject,'String')) returns contents of Wdel as a double
% --- Executes during object creation, after setting all properties.
function Wdel_CreateFcn(hObject, eventdata, handles)
% hObject handle to Wdel (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles empty - handles not created until after all CreateFcns called
% Hint: edit controls usually have a white background on Windows.
% See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
set(hObject,'BackgroundColor','white');
end
% --- Executes on selection change in filter_choose.
function filter_choose_Callback(hObject, eventdata, handles)
% hObject handle to filter_choose (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% Hints: contents = cellstr(get(hObject,'String')) returns filter_choose contents as cell array
% contents{get(hObject,'Value')} returns selected item from filter_choose
bl1=getappdata(handles.panal1,'bl1');
bl2=getappdata(handles.panal1,'bl2');
bf_window=getappdata(handles.panal1,'bf_window');
bh=getappdata(handles.panal1,'bh');
bs=getappdata(handles.panal1,'bs');
Wn=getappdata(handles.panal1,'Wn');
select=get(handles.filter_choose,'value');
switch select
case 1
axes(handles.axes1);
plot(20*log10(abs(fft(bs))));
axis([0 3*Wn -40 1]);
axes(handles.axes2);
plot(angle(fft(bs)));
axis([0 Wn -4 1]);
case 2
axes(handles.axes1);
plot(20*log10(abs(fft(bl1))));
axis([0 3*Wn -40 1]);
axes(handles.axes2);
plot(angle(fft(bl1)));
axis([0 Wn -4 1]);
case 3
axes(handles.axes1);
plot(20*log10(abs(fft(bl2))));
axis([0 3*Wn -40 1]);
axes(handles.axes2);
plot(angle(fft(bl2)));
axis([0 Wn -4 1]);
case 4
axes(handles.axes1);
plot(20*log10(abs(fft(bf_window))));
axis([0 3*Wn -40 1]);
axes(handles.axes2);
plot(angle(fft(bf_window)));
axis([0 Wn -4 1]);
case 5
axes(handles.axes1);
plot(20*log10(abs(fft(bh))));
axis([0 3*Wn -40 1]);
axes(handles.axes2);
plot(angle(fft(bh)));
axis([Wn 2*Wn -4 1]);
end
% --- Executes during object creation, after setting all properties.
function filter_choose_CreateFcn(hObject, eventdata, handles)
% hObject handle to filter_choose (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles empty - handles not created until after all CreateFcns called
% Hint: popupmenu controls usually have a white background on Windows.
% See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
set(hObject,'BackgroundColor','white');
end