sonoexpofn.m

非常好的数字处理教程

function sonoexpofn(action, datastruct)

    if nargin < 1
        action='init';
    end

	% Add log yscaling
    % Strange error when 'Explore' button is pressed for the first time.
    
	name = mfilename;
	figname = [name(1:end-2) '_fig'];
	f=findobj('Tag',figname);
    handles = get(f,'UserData');

    switch action
		case 'help'
			display_help(figname);
    case 'init'
			setdefaults;
			movegui(f,'center');
			reset(handles.winplot);
			reset(handles.timeplot);
			reset(handles.specplot);
			handles.exponum = 0;
			loadWindowPlot(handles);
        case 'resize'
            movegui(f,'onscreen');
		case 'loadsound'
			handles.audiodata = load_audiodata;
			if ~isfield(handles.audiodata, 'filenamepath')
				return;
			end
			if (size(handles.audiodata.data,2) > 1)
				handles.audiodata.data = to_mono(handles.audiodata.data);
			end
			set(handles.freqzoom,'Value',1.0);
			contents = get(handles.fftsize,'String');
			fftsize = str2double(contents{get(handles.fftsize,'Value')});
			contents = get(handles.Window,'String');
			shape = contents{get(handles.Window,'Value')};
			[handles.spectrum, handles.bin, handles.st] = ...
				spectrogram(handles.audiodata, fftsize, shape);
			loadWindowPlot(handles);
			handles = makeTimePlot(handles);
			handles = makeSpecPlot(handles);
			linkedzoom([handles.timeplot, handles.specplot],'onx');
			place_header(f,handles);
		case 'readinput'
			setdefaults;
			movegui(f,'center');
			reset(handles.winplot);
			reset(handles.timeplot);
			reset(handles.specplot);
			handles.audiodata = datastruct;
			clear datastruct;
			handles.audiodata.filenamepath = '';
			handles.audiodata.nBits = 16;
			handles.audiodata.channels = size(handles.audiodata.data,2);
            if handles.audiodata.channels > 1
                handles.audiodata.data = to_mono(handles.audiodata.data);
            end
			contents = get(handles.fftsize,'String');
			fftsize = str2double(contents{get(handles.fftsize,'Value')});
			contents = get(handles.Window,'String');
			shape = contents{get(handles.Window,'Value')};
			[handles.spectrum, handles.bin, handles.st] = ...
				spectrogram(handles.audiodata, fftsize, shape);
			loadWindowPlot(handles);
			handles = makeTimePlot(handles);
			handles = makeSpecPlot(handles);
			linkedzoom([handles.timeplot, handles.specplot],'onx');
			place_header(f,handles);
		case 'playsound'
			if isfield(handles,'audiodata'),
				times = get(handles.timeplot,'XLim');
				audiodata = handles.audiodata;
				samples = floor(times*audiodata.Fs);
				if (samples(1) <= 0) 
					samples(1) = 1;
				end
				if (samples(2) > length(audiodata.data))
					samples(2) = length(audiodata.data);
				end
				audiodata.data = audiodata.data(samples(1):samples(2));
				if (max(abs(audiodata.data)) > 1.0)
					audiodata.data = normalize(audiodata.data);
				end
				play_audiodata(audiodata, handles.play);
			end
		case {'db','inverse','interpolate','colormap'}
			if isfield(handles,'audiodata')
				updateSpecPlot(handles);
                set(handles.specplot,'XLim',get(handles.timeplot,'XLim'));
                sonoexpofn 'freqzoom';
			end
		case {'fftsize','window'}
			loadWindowPlot(handles);
			if isfield(handles,'audiodata')
				contents = get(handles.fftsize,'String');
				fftsize = str2double(contents{get(handles.fftsize,'Value')});
				contents = get(handles.Window,'String');
				shape = contents{get(handles.Window,'Value')};

				[handles.spectrum, handles.bin, handles.st] = ...
					spectrogram(handles.audiodata, fftsize, shape);
				updateSpecPlot(handles);
				set(handles.specplot,'XLim',get(handles.timeplot,'XLim'));
                sonoexpofn 'freqzoom';
			end
		case 'freqzoom'
			if isfield(handles,'audiodata')
				val = get(handles.freqzoom,'Value');
				if val == 0,
					val = 0.001;
				end
				Fs = handles.audiodata.Fs;
				set(handles.specplot,'YLim',[0 val*Fs/2])
			end
		case 'normalize'
			if isfield(handles,'audiodata')
				handles.audiodata.data = normalize(handles.audiodata.data);
				contents = get(handles.fftsize,'String');
				fftsize = str2double(contents{get(handles.fftsize,'Value')});
				contents = get(handles.Window,'String');
				shape = contents{get(handles.Window,'Value')};
				[handles.spectrum, handles.bin, handles.st] = ...
					spectrogram(handles.audiodata, fftsize, shape);
				updateSpecPlot(handles);
                set(handles.specplot,'XLim',get(handles.timeplot,'XLim'));
				updateTimePlot(handles);
                set(handles.timeplot,'XLim',get(handles.specplot,'XLim'));
				linkedzoom([handles.timeplot, handles.specplot],'onx');
                sonoexpofn 'freqzoom';
			end
        case 'zoomreset'
            if isfield(handles,'audiodata')
                handles = makeTimePlot(handles);
                set(handles.specplot,'XLim',get(handles.timeplot,'XLim'));
                linkedzoom([handles.timeplot, handles.specplot],'onx');
            end
		case 'explore_data'
			if isfield(handles,'audiodata'),
				explore_data(handles);
			end
        case {'fourier', 'alias', 'feature', 'firexpo', 'iirexpo', 'formantexpo', 'lpcexpo'}
            if isfield(handles,'audiodata'),
                audiodata = handles.audiodata;
			    switch action
				    case 'fourier'
				        fourierexpogui(audiodata);
                    case 'alias'
                        aliasexpogui(audiodata);
                    case 'feature'
                        featurexpogui(audiodata);
                    case 'firexpo'
                        firexpogui(audiodata);
                    case 'iirexpo'
                        iirexpogui(audiodata);
                    case 'formantexpo'
                        formantexpogui(audiodata);
                    case 'lpcexpo'
						lpcexpogui(audiodata);
			    end
            end
		case 'print'
			print_figure(f);
		case 'close'
			close_figure(f,figname(1:end-4));
			return;
	end
	set(f,'UserData',handles);

% --------------------------------------------------------------------
function loadWindowPlot(handles);
    contents = get(handles.fftsize,'String');
    num_samples = str2double(contents{get(handles.fftsize,'Value')});
	contents = get(handles.Window,'String');
    shape = contents{get(handles.Window,'Value')};
	windowdata = get_windowdata(num_samples, shape);
	axes(handles.winplot);
	plot([0:num_samples+1],[0;windowdata;0]);
	grid;
	set(handles.winplot,'YTickLabel',['']);
	set(handles.winplot,'XLim',[-5 num_samples+5],'YLim',[0 1.1]);

function handles = makeTimePlot(handles);
	axes(handles.timeplot);
	handles.t = [0:1/handles.audiodata.Fs:(length(handles.audiodata.data)-1)/...
		handles.audiodata.Fs];
	plot(handles.t,handles.audiodata.data)
	maxtime = length(handles.t)/handles.audiodata.Fs;
	set(handles.timeplot,'XLim',[0 maxtime]);
	set(handles.timeplot,'YLim',[-1.0 1.0]);
	grid;
	xlabel('time (s)');

function handles = makeSpecPlot(handles);
	axes(handles.specplot);
	handles.pos = get(gca,'Position'); % Save axes position
	if (get(handles.interpolate,'Value'))
		if (get(handles.dBcheckbox,'Value'))
			pcolor(handles.st,handles.bin,20*log10(abs(handles.spectrum)));
		else
			pcolor(handles.st,handles.bin,abs(handles.spectrum));
		end
		shading interp;
	else
		if (get(handles.dBcheckbox,'Value'))
			imagesc(handles.t,handles.bin,20*log10(abs(handles.spectrum)));
		else
			imagesc(handles.t,handles.bin,abs(handles.spectrum));
		end
	end
	axis xy;
	ylabel('Frequency (Hz)');
	colormap('Jet');
	set(handles.specplot,'XTickLabel',['']);

	h = colorbar('vert');
	if (get(handles.dBcheckbox,'Value'))
		set(get(h, 'YLabel'), 'String', 'dB');
	else
		set(get(h, 'YLabel'), 'String', 'Amplitude');
	end
    set(handles.specplot,'Units','Characters');
	sonopos = get(handles.specplot,'Position')
	set(h,'units','Characters', ...
		'Position',[sonopos(1)+sonopos(3)+18 sonopos(2) 7 sonopos(4)]);
	switch computer
        case {'GLNX86','MAC'}
            %set(gca,'Position',handles.pos + [0 0.07 0 0])
            set(gca,'Position',handles.pos)
        case 'PCWIN'
            set(gca,'Position',handles.pos)
    end

	handles.xlim_specplot_orig = get(handles.specplot,'XLim');
	handles.ylim_specplot_orig = get(handles.specplot,'YLim');
	handles.xlim_timeplot_orig = get(handles.timeplot,'XLim');
	handles.ylim_timeplot_orig = get(handles.timeplot,'YLim');
	handles.xlim_specplot = handles.xlim_specplot_orig;
	handles.ylim_specplot = handles.ylim_specplot_orig;
	handles.xlim_timeplot = handles.xlim_timeplot_orig;
	handles.ylim_timeplot = handles.ylim_timeplot_orig;


% --------------------------------------------------------------------
function updateTimePlot(handles)
	axes(handles.timeplot)
	plot(handles.t,handles.audiodata.data)
	set(handles.timeplot,'XLim',handles.xlim_specplot);
	%set(handles.timeplot,'YLim',handles.ylim_specplot);
	xlabel('time (s)');
	grid;

function updateSpecPlot(handles)
	axes(handles.specplot);
	% Check Interpolate and dB
	if (get(handles.interpolate,'Value'))
		if (get(handles.dBcheckbox,'Value'))
			pcolor(handles.st,handles.bin,20*log10(abs(handles.spectrum)));
		else
			pcolor(handles.st,handles.bin,abs(handles.spectrum));
		end
		shading interp;
	else
		if (get(handles.dBcheckbox,'Value'))
			imagesc(handles.t,handles.bin,20*log10(abs(handles.spectrum)));
		else
			imagesc(handles.t,handles.bin,abs(handles.spectrum));
		end
	end
	set(handles.specplot,'XTickLabel',['']);
	axis xy;
	ylabel('Frequency (Hz)');
	% Get Colormap
	contents = get(handles.colormap,'String');
	cmap = colormap(lower(contents{get(handles.colormap,'Value')}));
	% Handle Inverse
	if (get(handles.inverse,'Value'))
		colormap(flipud(cmap));
	else
		colormap(cmap);
	end
	set(handles.specplot,'XLim',handles.xlim_specplot);
	set(handles.specplot,'YLim',handles.ylim_specplot);

	h = colorbar('vert');
	if (get(handles.dBcheckbox,'Value'))
		set(get(h, 'YLabel'), 'String', 'dB');
	else
		set(get(h, 'YLabel'), 'String', 'Amplitude');
	end
	set(handles.specplot,'Units','Characters');
	sonopos = get(handles.specplot,'Position')
	set(h,'units','Characters', ...
		'Position',[sonopos(1)+sonopos(3)+18 sonopos(2) 7 sonopos(4)])
    switch computer
        case {'GLNX86','MAC'}
            %set(gca,'Position',handles.pos + [0 0.07 0 0])
            set(gca,'Position',handles.pos)
        case 'PCWIN'
            set(gca,'Position',handles.pos)
    end


% --------------------------------------------------------------------
function explore_data(handles)
	exponum = handles.exponum+1;
	axes(handles.specplot);
    uiwait(msgbox('Press enter when finished...','Instructions','modal'));
	[t,f] = ginput;
	bindiff = handles.bin(2) - handles.bin(1);
	timedif = handles.st(2) - handles.st(1);
	freqstring = sprintf('%s',['freqs_' num2str(exponum) ' = [']);
	timestring = sprintf('%s',['times_' num2str(exponum) ' = [']);
	ampstring = sprintf('%s',['amps_' num2str(exponum) ' = [']);
	for i=1:length(t),
		freqindex = find(handles.bin > (f(i) - bindiff/2) & ...
			handles.bin < (f(i) + bindiff/2));
		timeindex = find(handles.st > (t(i) - timedif/2) & ...
			handles.st < (t(i) + timedif/2));

		freqs = handles.bin(freqindex);
		tempstring = sprintf(' %4.2f ',freqs);
		freqstring = strcat(freqstring, tempstring);

		times = handles.st(timeindex);
		tempstring = sprintf(' %4.3f ',times);
		timestring = strcat(timestring, tempstring);

		amps = abs(handles.spectrum(freqindex,timeindex));
		tempstring = sprintf(' %4.4f ', amps);
		ampstring = strcat(ampstring, tempstring);
	end
	freqstring = strcat(freqstring, '];');
	timestring = strcat(timestring, '];');
	ampstring = strcat(ampstring, '];');
	disp(freqstring);
	disp(timestring);
	disp(ampstring);
	fprintf('\n');