【信号处理】音频信号处理平台含Matlab源码

最新推荐文章于 2023-09-19 12:46:18 发布

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本文介绍了使用MATLAB设计的一种声音信号频谱分析仪，包括界面设计、代码实现细节、时域频域分析对比以及误差分析。通过实例展示了如何通过软件进行音频信号处理，并探讨了不同分析方法的异同。

1 简介

本文给出了基于MATLAB的声音信号频谱分析仪的设计原理与实现方法.在实现方法上,结合软件的界面和具体的代码讲述了整个软件编码实现的原理.最后结合一个运行实例比较了时域分析与频域分析计算频率的异同之处,并分析了误差的原因.

2 部分代码

function varargout = yonghujiemain(varargin)% YONGHUJIEMAIN M-file for yonghujiemain.fig%      YONGHUJIEMAIN, by itself, creates a new YONGHUJIEMAIN or raises the existing%      singleton*.%%      H = YONGHUJIEMAIN returns the handle to a new YONGHUJIEMAIN or the handle to%      the existing singleton*.%%      YONGHUJIEMAIN('CALLBACK',hObject,eventData,handles,...) calls the local%      function named CALLBACK in YONGHUJIEMAIN.M with the given input arguments.%%      YONGHUJIEMAIN('Property','Value',...) creates a new YONGHUJIEMAIN or raises the%      existing singleton*.  Starting from the left, property value pairs are%      applied to the GUI before yonghujiemain_OpeningFunction gets called.  An%      unrecognized property name or invalid value makes property application%      stop.  All inputs are passed to yonghujiemain_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 yonghujiemain% Last Modified by GUIDE v2.5 03-Jun-2011 16:50:18% Begin initialization code - DO NOT EDITgui_Singleton = 1;gui_State = struct('gui_Name',       mfilename, ...                   'gui_Singleton',  gui_Singleton, ...                   'gui_OpeningFcn', @yonghujiemain_OpeningFcn, ...                   'gui_OutputFcn',  @yonghujiemain_OutputFcn, ...                   'gui_LayoutFcn',  [] , ...                   'gui_Callback',   []);if nargin && ischar(varargin{1})    gui_State.gui_Callback = str2func(varargin{1});endif 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 yonghujiemain is made visible.function yonghujiemain_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 yonghujiemain (see VARARGIN)% Choose default command line output for yonghujiemainhandles.output = hObject;% Update handles structureguidata(hObject, handles);% UIWAIT makes yonghujiemain wait for user response (see UIRESUME)% uiwait(handles.figure1);% --- Outputs from this function are returned to the command line.function varargout = yonghujiemain_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 structurevarargout{1} = handles.output;% --- Executes on button press in turn_down.function turn_down_Callback(hObject, eventdata, handles)% hObject    handle to turn_down (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 turn_up.function turn_up_Callback(hObject, eventdata, handles)% hObject    handle to turn_up (see GCBO)% eventdata  reserved - to be defined in a future version of MATLAB% handles    structure with handles and user data (see GUIDATA)% --- Executes on selection change in popupmenu1.function popupmenu1_Callback(hObject, eventdata, handles)% hObject    handle to popupmenu1 (see GCBO)% eventdata  reserved - to be defined in a future version of MATLAB% handles    structure with handles and user data (see GUIDATA)% Hints: contents = get(hObject,'String') returns popupmenu1 contents as cell array%        contents{get(hObject,'Value')} returns selected item from popupmenu1% --- Executes during object creation, after setting all properties.function popupmenu1_CreateFcn(hObject, eventdata, handles)% hObject    handle to popupmenu1 (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% --- Executes on button press in speed_up.function speed_up_Callback(hObject, eventdata, handles)% hObject    handle to speed_up (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 slow_down.function slow_down_Callback(hObject, eventdata, handles)% hObject    handle to slow_down (see GCBO)% eventdata  reserved - to be defined in a future version of MATLAB% handles    structure with handles and user data (see GUIDATA)% --- Executes on selection change in popupmenu2.function popupmenu2_Callback(hObject, eventdata, handles)% hObject    handle to popupmenu2 (see GCBO)% eventdata  reserved - to be defined in a future version of MATLAB% handles    structure with handles and user data (see GUIDATA)% Hints: contents = get(hObject,'String') returns popupmenu2 contents as cell array%        contents{get(hObject,'Value')} returns selected item from popupmenu2% --- Executes during object creation, after setting all properties.function popupmenu2_CreateFcn(hObject, eventdata, handles)% hObject    handle to popupmenu2 (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% --- Executes on button press in insert.function insert_Callback(hObject, eventdata, handles)% hObject    handle to insert (see GCBO)% eventdata  reserved - to be defined in a future version of MATLAB% handles    structure with handles and user data (see GUIDATA)global  fn x Fs bits;