主成分分析 （PCA） 和独立成分分析 （ICA）附Matlab代码.zip

classdef PlayAudio < handle % % Class for playing and visualizing audio files % % Brian Moore % [email protected] % % November 10, 2016 % % % Private constants % properties (GetAccess = private, Constant = true) % Audio FPS = 15; % Graphics playback, frames/sec LATENCY_MS = 500; % Audioplayer latency, in ms WINDOW_MS = 50; % Spectrogram window width, in ms % GUI GUI_NAME = 'Audio Player'; % GUI name Y_PAD = 0.05; % Ampitude (y-axis) padding LINEWIDTH = 1; % Status linewidth FONT_SIZE = 10; % Font size AXIS_GAP = 40; % Axis gap, in pixels LIST_GAP = 20; % List gap, in pixels TOP_GAP = 35; % Top gap, in pixels LEFT_GAP = 60; % Left gap, in pixels LIST_WIDTH = 150; % List width, in pixels BUTTON_HEIGHT = 20; % Button height, in pixels % Colors WAVE_COLOR = [93, 147, 191] / 255; % Waveform color STATUS_COLOR = [0, 0, 0] / 255; % Waveform status color PLAY_COLOR = [252, 252, 252] / 255; % Active color STOP_COLOR = [204, 51, 51] / 255; % Stop color end % % Public GetAccess properties % properties (GetAccess = public, SetAccess = private) isPlaying = false; % Playback status currIdx = nan; % Current track index end % % Private properties % properties (Access = public) % Data audio; % Audio data % Graphics fig; % Figure handle ax1; % Waveform axis handle ax2; % Spectrogram axis handle ax3; % Track list title axis handle listh; % Audio list handle playh; % Play button handle ph1; % Waveform slider handle ph2; % Spectrofram slider handle xLim; % Axes x-limits yLim1; % Waveform y-limits yLim2; % Spectrogram y-limits end % % Public methods % methods (Access = public) % % Constructor % function this = PlayAudio(audio) % Syntax: player = PlayAudio(); % player = PlayAudio(audio); % Parse inputs this.audio = audio; % Initialize GUI this.InitializeGUI(); end % % Select track % function Select(this,idx) idx = max(1,min(idx,numel(this.audio))); this.SetTrack(idx); end % % Start playback % function Start(this) if ~this.isPlaying resume(this.audio(this.currIdx).player); end this.UpdateButton(); end % % Stop playback % function Stop(this) if this.isPlaying pause(this.audio(this.currIdx).player); end this.UpdateButton(); end % % Toggle playback % function TogglePlayback(this) if this.isPlaying this.Stop(); else this.Start(); end end % % Reset playback % function Reset(this) stop(this.audio(this.currIdx).player); this.UpdateButton(); this.UpdateStatusLine(); end % % Close player % function Close(this) try this.Reset(); catch %#ok % Empty end try delete(this.fig); catch %#ok delete(gcf); end end end % % Private methods % methods (Access = private) % % Handle list selection % function HandleListSelection(this) value = get(this.listh,'Value'); this.SetTrack(value); end % % Handle keypress % function HandleKeyPress(this,e) % Parse keypress keyChar = e.Character; if isempty(keyChar) return; end % Handle keypress switch double(keyChar) case 13 % Enter % Toggle playback this.TogglePlayback(); case {28, 8, 127} % {Left arrow, backspace, delete} % Reset playback this.Reset(); end end % % Set playing status % function SetPlayStatus(this,isPlaying) this.isPlaying = isPlaying; this.UpdateButton(); this.UpdateStatusLine(); end % % Set track % function SetTrack(this,idx) if idx == this.currIdx return; elseif ~isnan(this.currIdx) this.Reset(); this.audio(this.currIdx).player = []; end % Update track this.currIdx = idx; % Get data y = max(-1,min(this.audio(this.currIdx).y,1)); Fs = this.audio(this.currIdx).Fs; Ny = numel(y); t = (1:Ny) / Fs; % Compute spectrogram window = this.WINDOW_MS * (Fs / 1000); [S, F, T] = spectrogram(y,window,[],[],Fs,'yaxis'); P = 10 * log10(abs(S)); % Update axis limits this.xLim = [t(1), t(Ny)]; this.yLim1 = [-1, 1]; this.yLim2 = [min(F), max(F)]; % Update waveform axLim1 = [this.xLim, this.yLim1 + this.Y_PAD * [-1, 1]]; set(this.ph1(1),'XData',t,'YData',y); axis(this.ax1,axLim1); % Update spectrogram axLim2 = [this.xLim, this.yLim2]; set(this.ph1(2),'XData',T, ... 'YData',F, ... 'ZData',zeros(size(P)), ... 'CData',P); axis(this.ax2,axLim2); % Construct audio player player = audioplayer(y,Fs); player.TimerPeriod = round(1000 / this.FPS) / 1000; player.StartFcn = @(s,e)this.SetPlayStatus(true); player.StopFcn = @(s,e)this.SetPlayStatus(false); player.TimerFcn = @(s,e)this.UpdateStatusLine(); this.audio(this.currIdx).player = player; end % % Update track list % function UpdateTrackList(this) set(this.listh,'String',{this.audio.name}); end % % Update button % function UpdateButton(this) if this.isPlaying set(this.playh,'String','Stop' ,... 'BackgroundColor',this.STOP_COLOR, ... 'ForegroundColor',[1, 1, 1]); else set(this.playh,'String','Play', ... 'BackgroundColor',this.PLAY_COLOR, ... 'ForegroundColor',[0, 0, 0]); end end % % Update status line % function UpdateStatusLine(this) % Get current time if this.isPlaying n = this.audio(this.currIdx).playe