本研究探讨了在双音多频（DTMF）拨号系统中应用数字信号处理技术的方法与优势，包括信号检测、噪声抑制及编码优化等方面。
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 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.
handles.output = hObject;
guidata(hObject, handles);
% UIWAIT makes key1 wait for user response (see UIRESUME)
% --- Outputs from this function are returned to the command line.
function varargout = key1_OutputFcn(hObject, eventdata, handles)
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
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