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在本文中，我们将介绍如何使用MATLAB设计和实现一个双音多频（DTMF）拨号系统。DTMF拨号系统是一种用于电话通信的信号编码技术，它通过发送两个频率不同的音调信号来表示电话键盘上的数字和符号。我们将使用MATLAB中的数字信号处理工具箱来生成和解码DTMF信号。
首先，我们需要生成DTMF信号以模拟电话键盘上的按键操作。DTMF信号由两个频率组成，一个低频和一个高频。以下是DTMF信号的频率表：
| 1209 Hz | 1336 Hz | 1477 Hz | 1633 Hz | |
|---|---|---|---|---|
| 1 | X | |||
| 2 | X | |||
| 3 | X | |||
| 4 | X | X | ||
| 5 | X | X |
【数字信号】基于matlab GUI DTMF双音多频电话拨号仿真【含Matlab源码 805期】
DTMF双音多频电话拨号仿真 完整的代码，方可运行；可提供运行操作视频！适合小白！
【数字信号】基于matlab GUI DTMF双音多频手机拨号仿真系统【含Matlab源码 1085期】
DTMF双音多频手机拨号仿真系统 完整的代码，方可运行；可提供运行操作视频！适合小白！
【数字信号】DTMF双音多频电话拨号仿真【含GUI Matlab源码 805期】
DTMF双音多频电话拨号仿真 完整的代码，方可运行；可提供运行操作视频！适合小白！
【数字信号】基于matlab GUI DTMF双音多频电话拨号仿真（电话号码归属地匹配）【含Matlab源码 2670期】
1 含义双音多频 DTMF（Dual Tone Multi Frequency），双音多频，由高频群和低频群组成，高低频群各包含4个频率。一个高频信号和一个低频信号叠加组成一个组合信号，代表一个数字。DTMF信令有16个编码。利用DTMF信令可选择呼叫相应的对讲机。双音多频信号（DTMF），电话系统中电话机与交换机之间的一种用户信令，通常用于发送被叫号码。在使用双音多频信号之前，电话系统中使用一连串的断续脉冲来传送被叫号码，称为脉冲拨号。脉冲拨号需要电信局中的操作员手工完成长途接续。
数字信号处理在双音多频拨号系统中的应用
function varargout = key1(varargin) % KEY1 M-file for key1.fig % KEY1, by itself, creates a new KEY1 or raises the existing % singleton*. % % H = KEY1 returns the handle to a new KEY1 or the handle to % the existing singleton*. % % KEY1('CALLBACK',hObject,eventData,handles,...) calls the local % function named CALLBACK in KEY1.M with the given input arguments. % % KEY1('Property','Value',...) creates a new KEY1 or raises the % existing singleton*. Starting from the left, property value pairs are % applied to the GUI before key1_OpeningFunction gets called. An % unrecognized property name or invalid value makes property application % stop. All inputs are passed to key1_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 % Copyright 2002-2003 The MathWorks, Inc. % Edit the above text to modify the response to help key1 % Last Modified by GUIDE v2.5 13-Dec-2009 23:16:54 % Begin initialization code - DO NOT EDIT gui_Singleton = 1; gui_State = struct('gui_Name', mfilename, ... 'gui_Singleton', gui_Singleton, ... 'gui_OpeningFcn', @key1_OpeningFcn, ... 'gui_OutputFcn', @key1_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 key1 is made visible. function key1_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 key1 (see VARARGIN) % Choose default command line output for key1 handles.output = hObject; % Update handles structure guidata(hObject, handles); % UIWAIT makes key1 wait for user response (see UIRESUME) % uiwait(handles.figure1); % --- Outputs from this function are returned to the command line. function varargout = key1_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; % --- Executes on button press in pushbutton1. function pushbutton1_Callback(hObject, eventdata, handles) d='1'; val=telephone(d); ppu(val) str = get(handles.pushbutton1,'string'); set(handles.edit1,'string',str) % hObject handle to pushbutton1 (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 pushbutton2. function pushbutton2_Callback(hObject, eventdata, handles) d='2'; val=telephone(d); ppu(val) str = get(handles.pushbutton2,'string'); set(handles.edit1,'string',str) % 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 pushbutton3. function pushbutton3_Callback(hObject, eventdata, handles) d='3'; val=telephone(d); ppu(val) str = get(handles.pushbutton3,'string'); set(handles.edit1,'string',str) % hObject handle to pushbutton3 (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 pushbutton4. function pushbutton4_Callback(hObject, eventdata, handles) d='A'; val=telephone(d); ppu(val) str = get(handles.pushbutton4,'string'); set(handles.edit1,'string',str) % hObject handle to pushbutton4 (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 pushbutton5. function pushbutton5_Callback(hObject, eventdata, handles) d='4'; val=telephone(d); ppu(val) str = get(handles.pushbutton5,'string'); set(handles.edit1,'string',str) % hObject handle to pushbutton5 (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 pushbutton6. function pushbutton6_Callback(hObject, eventdata, handles) d='5'; val=telephone(d); ppu(val) str = get(handles.pushbutton6,'string'); set(handles.edit1,'string',str) % hObject handle to pushbutton6 (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 pushbutton7. function pushbutton7_Callback(hObject, eventdata, handles) d='6'; val=telephone(d); ppu(val) str = get(handles.pushbutton7,'string'); set(handles.edit1,'string',str) % hObject handle to pushbutton7 (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 pushbutton8. function pushbutton8_Callback(hObject, eventdata, handles) d='B'; val=telephone(d); ppu(val) str = get(handles.pushbutton8,'string'); set(handles.edit1,'string',str) % 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) % --- Executes on button press in pushbutton9. function pushbutton9_Callback(hObject, eventdata, handles) d='7'; val=telephone(d); ppu(val) str = get(handles.pushbutton9,'string'); set(handles.edit1,'string',str) % hObject handle to pushbutton9 (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 pushbutton11. function pushbutton11_Callback(hObject, eventdata, handles) d='9'; val=telephone(d); ppu(val) str = get(handles.pushbutton11,'string'); set(handles.edit1,'string',str) % hObject handle to pushbutton11 (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 pushbutton12. function pushbutton12_Callback(hObject, eventdata, handles) d='C'; val=telephone(d); ppu(val) str = get(handles.pushbutton12,'string'); set(handles.edit1,'string',str) % hObject handle to pushbutton12 (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 pushbutton13. function pushbutton13_Callback(hObject, eventdata, handles) d='*'; val=telephone(d); ppu(val) str = get(handles.pushbutton13,'string'); set(handles.edit1,'string',str) % hObject handle to pushbutton13 (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 pushbutton14. function pushbutton14_Callback(hObject, eventdata, handles) d='0'; val=telephone(d); ppu(val) str = get(handles.pushbutton14,'string'); set(handles.edit1,'string',str) % hObject handle to pushbutton14 (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 pushbutton15. function pushbutton15_Callback(hObject, eventdata, handles) d='#'; val=telephone(d); ppu(val) str = get(handles.pushbutton15,'string'); set(handles.edit1,'string',str) % hObject handle to pushbutton15 (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 pushbutton16. function pushbutton16_Callback(hObject, eventdata, handles) d='D'; val=telephone(d); ppu(val) str = get(handles.pushbutton16,'string'); set(handles.edit1,'string',str) % hObject handle to pushbutton16 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) function edit1_Callback(hObject, eventdata, handles) % hObject handle to edit1 (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 edit1 as text % str2double(get(hObject,'String')) returns contents of edit1 as a double % --- Executes during object creation, after setting all properties. function edit1_CreateFcn(hObject, eventdata, handles) % hObject handle to edit1 (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 set(hObject,'BackgroundColor','white'); else set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor')); end % --- Executes on button press in pushbutton10. function pushbutton10_Callback(hObject, eventdata, handles) d='8'; val=telephone(d); ppu(val) str = get(handles.pushbutton10,'string'); set(handles.edit1,'string',str) % hObject handle to pushbutton10 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA)
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