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⛄ 内容介绍
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.
⛄ 部分代码
function varargout = untitled(varargin)
% UNTITLED MATLAB code for untitled.fig
% UNTITLED, by itself, creates a new UNTITLED or raises the existing
% singleton*.
%
% H = UNTITLED returns the handle to a new UNTITLED or the handle to
% the existing singleton*.
%
% UNTITLED('CALLBACK',hObject,eventData,handles,...) calls the local
% function named CALLBACK in UNTITLED.M with the given input arguments.
%
% UNTITLED('Property','Value',...) creates a new UNTITLED or raises the
% existing singleton*. Starting from the left, property value pairs are
% applied to the GUI before untitled_OpeningFcn gets called. An
% unrecognized property name or invalid value makes property application
% stop. All inputs are passed to untitled_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 untitled
% Last Modified by GUIDE v2.5 12-Jan-2020 11:58:18
% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name', mfilename, ...
'gui_Singleton', gui_Singleton, ...
'gui_OpeningFcn', @untitled_OpeningFcn, ...
'gui_OutputFcn', @untitled_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 untitled is made visible.
function untitled_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 untitled (see VARARGIN)
% Choose default command line output for untitled
handles.output = hObject;
% --- Executes on button press in pushbutton8.
function pushbutton8_Callback(hObject, eventdata, handles)
% hObject handle to pushbutton8 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
global x fs
sigLength=length(x);%信号长度
t=(0:sigLength-1)/fs;
x1 = fft(x,sigLength);%傅里叶变换
halflength=floor(sigLength/2); %取一半
f=fs*(0:halflength)/sigLength; %频率范围.
axes(handles.axes1)
plot(t,x) %时域图
xlabel('t/s');
ylabel('幅度');
axes(handles.axes3)
plot(f,abs(x1(1:halflength+1)));%原始信号频谱图
xlabel('频率/Hz');
ylabel('幅度');
axes(handles.axes2)
cla
axes(handles.axes4)
cla
⛄ 运行结果
⛄ 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.
[2]郭思梦, 张培玲. 基于Matlab GUI的语音信号去噪处理[J]. 中小企业管理与科技, 2017(15):2.
