matlabGUI播放音调

要在Matlab GUI中播放音调，可以使用Matlab自带的`sound`函数。该函数可以播放一个向量中的音频数据。

以下是一个简单的示例GUI代码，演示如何在Matlab GUI中播放音调：

function varargout = tone_generator(varargin)
% TONE_GENERATOR MATLAB code for tone_generator.fig
%      TONE_GENERATOR, by itself, creates a new TONE_GENERATOR or raises the existing
%      singleton*.
%
%      H = TONE_GENERATOR returns the handle to a new TONE_GENERATOR or the handle to
%      the existing singleton*.
%
%      TONE_GENERATOR('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named CALLBACK in TONE_GENERATOR.M with the given input arguments.
%
%      TONE_GENERATOR('Property','Value',...) creates a new TONE_GENERATOR or raises the
%      existing singleton*.  Starting from the left, property value pairs are
%      applied to the GUI before tone_generator_OpeningFcn gets called.  An
%      unrecognized property name or invalid value makes property application
%      stop.  All inputs are passed to tone_generator_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 tone_generator

% Last Modified by GUIDE v2.5 23-Apr-2021 17:43:49

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @tone_generator_OpeningFcn, ...
                   'gui_OutputFcn',  @tone_generator_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 tone_generator is made visible.
function tone_generator_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 tone_generator (see VARARGIN)

% Choose default command line output for tone_generator
handles.output = hObject;

% Update handles structure
guidata(hObject, handles);

% UIWAIT makes tone_generator wait for user response (see UIRESUME)
% uiwait(handles.figure1);

% Set default properties for the tone
handles.duration = 1;        % duration of tone (seconds)
handles.frequency = 440;     % frequency of tone (Hz)

% Update handles structure with default properties
guidata(hObject,handles);

% --- Outputs from this function are returned to the command line.
function varargout = tone_generator_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)
% 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)

% Generate tone
t = linspace(0,handles.duration,44100*handles.duration); % 44.1 kHz sampling rate
y = sin(2*pi*handles.frequency*t);

% Play tone
sound(y,44100);

% --- Executes on slider movement.
function slider1_Callback(hObject, eventdata, handles)
% hObject    handle to slider1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Update frequency value
handles.frequency = get(hObject,'Value');

% Update frequency display
set(handles.text2,'String',['Frequency: ' num2str(handles.frequency) ' Hz']);

% Update handles structure
guidata(hObject,handles);

% --- Executes during object creation, after setting all properties.
function slider1_CreateFcn(hObject, eventdata, handles)
% hObject    handle to slider1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Set slider properties
set(hObject,'Min',0,'Max',1000,'Value',440);

% --- Executes on slider movement.
function slider2_Callback(hObject, eventdata, handles)
% hObject    handle to slider2 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Update duration value
handles.duration = get(hObject,'Value');

% Update duration display
set(handles.text3,'String',['Duration: ' num2str(handles.duration) ' s']);

% Update handles structure
guidata(hObject,handles);

% --- Executes during object creation, after setting all properties.
function slider2_CreateFcn(hObject, eventdata, handles)
% hObject    handle to slider2 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Set slider properties
set(hObject,'Min',0,'Max',10,'Value',1);

% --- 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)

% Stop sound if it is playing
stop();

此GUI界面包含两个滑块和两个按钮，一个滑块控制音调的频率，另一个滑块控制音调的持续时间。"Generate Tone"按钮将生成并播放音调，"Stop"按钮将停止播放。您可以根据需要修改GUI以满足您的要求。