MATLAB GUI音频信号处理（调音+调速+调频+滤波）的示例代码

下面是一个MATLAB GUI音频信号处理的示例代码，包括调音、调速、调频和滤波功能。代码注释中有详细的说明，希望能帮到您。

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

% Last Modified by GUIDE v2.5 28-Mar-2021 21:47:02

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

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

% Update handles structure
guidata(hObject, handles);

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

% Initialize audio player and recorder
handles.player = audioplayer(zeros(2, 44100), 44100);
handles.recorder = audiorecorder(44100, 16, 1);

% Set initial values of sliders
set(handles.pitch_slider, 'Value', 0);
set(handles.speed_slider, 'Value', 1);
set(handles.filter_slider, 'Value', 0);

% Update handles structure
guidata(hObject, handles);


% --- Outputs from this function are returned to the command line.
function varargout = audio_processing_gui_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 record_button.
function record_button_Callback(hObject, eventdata, handles)
% hObject    handle to record_button (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Check if already recording
if isrecording(handles.recorder)
    stop(handles.recorder);
    set(hObject, 'String', 'Record');
else
    record(handles.recorder);
    set(hObject, 'String', 'Stop Recording');
end


% --- Executes on button press in play_button.
function play_button_Callback(hObject, eventdata, handles)
% hObject    handle to play_button (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Check if audio is available to play
if ~isempty(handles.player.UserData)
    play(handles.player);
end


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

% Get current value of slider
pitch_shift = get(hObject, 'Value');

% Load audio data
audio_data = getaudiodata(handles.player);

% Apply pitch shift
audio_data = pitchshift(audio_data, handles.player.SampleRate, pitch_shift);

% Update audio player
handles.player.UserData = audio_data;

% Update handles structure
guidata(hObject, handles);


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

% Slider range and step size
set(hObject, 'Min', -12, 'Max', 12, 'Value', 0, 'SliderStep', [1/24 1/12]);


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

% Get current value of slider
speed_change = get(hObject, 'Value');

% Load audio data
audio_data = getaudiodata(handles.player);

% Apply speed change
audio_data = speedchange(audio_data, handles.player.SampleRate, speed_change);

% Update audio player
handles.player.UserData = audio_data;

% Update handles structure
guidata(hObject, handles);


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

% Slider range and step size
set(hObject, 'Min', 0.5, 'Max', 1.5, 'Value', 1, 'SliderStep', [1/10 1/5]);


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

% Get current value of slider
cutoff_freq = get(hObject, 'Value');

% Load audio data
audio_data = getaudiodata(handles.player);

% Apply low-pass filter
[B, A] = butter(2, cutoff_freq/handles.player.SampleRate, 'low');
audio_data = filter(B, A, audio_data);

% Update audio player
handles.player.UserData = audio_data;

% Update handles structure
guidata(hObject, handles);


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

% Slider range and step size
set(hObject, 'Min', 0, 'Max', handles.player.SampleRate/2, 'Value', 0, 'SliderStep', [1/handles.player.SampleRate 10/handles.player.SampleRate]);


% --- Executes when user attempts to close figure1.
function figure1_CloseRequestFcn(hObject, eventdata, handles)
% hObject    handle to figure1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Stop recording and playing
if isrecording(handles.recorder)
    stop(handles.recorder);
end
if isplaying(handles.player)
    stop(handles.player);
end

% Delete audio player and recorder
delete(handles.player);
delete(handles.recorder);

% Hint: delete(hObject) closes the figure
delete(hObject);


% --- Executes on button press in browse_button.
function browse_button_Callback(hObject, eventdata, handles)
% hObject    handle to browse_button (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Open file dialog box
[filename, pathname] = uigetfile({'*.wav', 'WAV files (*.wav)'});

% Check if file was selected
if ~isequal(filename, 0) && ~isequal(pathname, 0)
    % Load audio file
    [audio_data, sample_rate] = audioread(fullfile(pathname, filename));
    
    % Set audio player data and sample rate
    handles.player = audioplayer(audio_data, sample_rate);
    
    % Update sliders and audio player data in GUI
    set(handles.pitch_slider, 'Value', 0);
    set(handles.speed_slider, 'Value', 1);
    set(handles.filter_slider, 'Value', 0);
    handles.player.UserData = audio_data;
    
    % Update GUI title with file name
    set(handles.figure1, 'Name', sprintf('Audio Processing GUI - %s', filename));
    
    % Update handles structure
    guidata(hObject, handles);
end

注意：该代码需要一个GUI界面文件，可以通过MATLAB的GUIDE工具创建。