www.gusucode.com > 声音的处理有：LPC，FFT，共振峰，频谱源码程序 > siganlandsystemusingMatlab/SSUM/fdeqexpo/fdeqexpofn.m
function fdeqexpofn(action,datastruct)
% This code borrows heavily from MAD polezero demonstration
if nargin < 1
action='init';
end
% Maybe 'apply to white noise' button
% How do you set the plots so that one zooms and the other doesn't????
% Phase in radians, +- pi
% Fix impulse response, zoom in...
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;
reset(handles.freq_plot);
reset(handles.phase_plot);
reset(handles.impulse_plot);
handles.npoints = 256;
handles = makePlots(handles);
handles = updatePlots(handles);
linkedzoom([handles.freq_plot, handles.phase_plot],'onx');
case 'reset'
set(handles.b_n,'String','1');
set(handles.a_n,'String','1');
updateEq(handles);
handles = updatePlots(handles);
case 'readinput'
setdefaults;
reset(handles.freq_plot);
reset(handles.phase_plot);
reset(handles.impulse_plot);
handles.Fs = 44100;
handles.npoints = 256;
handles = makePlots(handles);
if isfield(datastruct,'polepos')
for i=1:length(datastruct.zeropos)/2,
x = real(datastruct.zeropos(i*2-1));
y = imag(datastruct.zeropos(i*2-1));
end
for i=1:length(datastruct.polepos)/2,
x = real(datastruct.polepos(i*2-1));
y = imag(datastruct.polepos(i*2-1));
end
end
handles = updatePlots(handles);
case {'a_n','b_n'}
updateEq(handles);
handles = updatePlots(handles);
case 'averager'
% Create GUI to input number
N = getNgui;
val = 1/N;
b_n = ones(1,N)./N;
b_n = num2str(b_n,'%2.3f ');
set(handles.b_n,'String',b_n);
set(handles.a_n,'String','1');
updateEq(handles);
handles = updatePlots(handles);
case 'db'
axes(handles.freq_plot);
if get(handles.dB,'Value')
set(handles.freq_plot,'YLim',[-80 1]);
ylabel('Normalized Attenuation (dB)');
else
%set(handles.freq_plot,'YLim',[0 1.05]);
%set(handles.freq_plot,'YLimMode','auto');
ylabel('Normalized Attenuation');
end
fdeqexpofn 'plotfreqz'
case 'unwrap'
if get(handles.unwrap,'Value')
set(handles.phase_plot,'YLimMode','auto');
else
set(handles.phase_plot,'YLim',[-pi pi]);
end
fdeqexpofn 'plotfreqz'
case 'grid'
if get(handles.grid,'Value')
axes(handles.freq_plot);
grid on;
axes(handles.phase_plot);
grid on;
axes(handles.impulse_plot);
grid on;
else
axes(handles.freq_plot);
grid off;
axes(handles.phase_plot);
grid off;
axes(handles.impulse_plot);
grid off;
end
case 'logf'
if get(handles.logf,'Value')
set(handles.freq_plot,'XScale','log');
set(handles.phase_plot,'XScale','log');
else
set(handles.freq_plot,'XScale','linear');
set(handles.phase_plot,'XScale','linear');
end
case 'loadvowel'
axes(handles.pz_plot);
cla;
delete(findobj(gcf,'Selected','on'))
makePZPlot(handles);
bws=[0.03 0.07 0.1]; %formant freqs from Rabiner & Juang
switch datastruct
case 'beet'
freqs=[270 2290 3010];
case 'bit'
freqs=[390 1990 2550];
case 'bet'
freqs=[530 1840 2480];
case 'bat'
freqs=[660 1720 2410];
case 'bart'
freqs=[730 1090 2440];
case 'bort'
freqs=[570 840 2410];
case 'but'
freqs=[440 1020 2240];
case 'boot'
freqs=[300 870 2240];
case 'bert'
freqs=[490 1350 1690];
otherwise
end
% convert freqs and bws to PZ locations
angs=2*pi*freqs/44100;
for fr=1:length(freqs)
[x,y]=pol2cart(angs(fr),1-bws(fr));
end
fdeqexpofn 'plotfreqz'
case 'plotfreqz'
handles = updatePlots(handles);
fdeqexpofn 'timezoom';
case {'pzexpo','pzfilterexpo'}
a_n = [str2num(get(handles.a_n,'String'))];
b_n = [str2num(get(handles.b_n,'String'))];
gain = str2num(get(handles.gain,'String'));
[b_n,a_n] = eqtflength(b_n,a_n);
[z,p,k] = tf2zp(b_n,a_n);
data.polepos = p;
data.zeropos = z;
data.gain = gain;
switch action
case 'pzexpo'
pzexpogui(data);
case 'pzfilterexpo'
pzfilterexpogui(data);
end
case 'convexpo'
a_n = [str2num(get(handles.a_n,'String'))];
b_n = [str2num(get(handles.b_n,'String'))];
[b_n,a_n] = eqtflength(b_n,a_n);
data.impulse = filter(b_n,a_n,[1 zeros(1,49)]);
convexpogui(data);
case 'timezoom'
if isfield(handles,'imp')
val = get(handles.timezoom,'Value');
if val == 0,
val = 0.001;
end
set(handles.impulse_plot,'XLim',[0 val*100])
imp = get(handles.implot(1),'YData');
set(handles.impulse_plot,'YLim', ...
[min(imp(1:ceil(val*100+1))) ...
1.1*max(imp(1:ceil(val*100+1)))]);
end
case 'print'
print_figure(f);
case 'close'
close_figure(f, figname(1:end-4));
return;
end
set(f,'UserData',handles);
% --------------------------------------------------------------------
function handles = makePlots(handles);
axes(handles.freq_plot);
handles.freqs=linspace(0,1,handles.npoints);
handles.freqline=line(handles.freqs,zeros(size(handles.freqs)));
set(handles.freqline,'EraseMode','xor');
axis normal; % Strange hack.
%set(handles.freq_plot,'YLim',[0 1.05],'XLim',[0 0.5]);
set(handles.freq_plot,'XLim',[0 0.5]);
set(handles.freq_plot, 'DrawMode','fast', 'NextPlot','replacechildren',...
'Box','off');
set(handles.freq_plot,'XTick',[],'XTickLabel','');
ylabel('Normalized Attenuation');
grid;
axes(handles.phase_plot);
handles.phaseline=line(handles.freqs,zeros(size(handles.freqs)));
set(handles.phaseline,'EraseMode','xor');
axis normal; % Strange hack.
set(handles.phase_plot,'YLim',[-pi pi],'XLim',[0 0.5]);
set(handles.phase_plot, 'DrawMode','fast', 'NextPlot','replacechildren',...
'Box','off');
xlabel('Normalized Frequency ({\varpi})');
ylabel('Phase (radians)');
set(handles.freq_plot,'XTick',get(handles.phase_plot,'XTick'));
grid;
axes(handles.impulse_plot);
handles.imp = zeros(1,500);
%handles.implot = plot(handles.imp);
handles.implot = stem(handles.imp);
set(handles.implot,'EraseMode','xor');
set(handles.impulse_plot,'XLim',[-1 100]);
set(handles.impulse_plot, 'DrawMode','fast', 'NextPlot','replacechildren');
xlabel('Sample');
grid;
%zoom on;
% --------------------------------------------------------------------
function ud = updatePlots(ud)
a_n = [str2num(get(ud.a_n,'String'))];
b_n = [str2num(get(ud.b_n,'String'))];
gain = str2num(get(ud.gain,'String'));
[h,w]=freqz(b_n,a_n,ud.npoints,'whole');
if get(ud.dB,'Value')
% normalise so max = 0 dB
logmag=20*log10(abs(h));
mag=logmag-max(logmag);
else
mag = gain*abs(h)./max(abs(h));
%mag = gain*abs(h);
end
set(ud.freqline,'YData',mag);
if get(ud.dB,'Value')
else
set(ud.freq_plot,'YLim',[0 max(mag)*1.1])
end
if get(ud.unwrap,'Value')
set(ud.phaseline,'YData',unwrap(angle(h)));
set(ud.phase_plot,'YLim',[min(unwrap(angle(h)))-1 max(unwrap(angle(h)))+1]);
else
set(ud.phaseline,'YData',angle(h));
end
imp = filter(b_n, a_n, [1, zeros(1,499)]);
set(ud.implot,'YData',imp(1:500));
% temp = get(ud.implot,'YData');
% temp(2:3:end) = imp(1:500);
% set(ud.implot,'YData',temp);
set(ud.impulse_plot,'YLim',[min(imp(1:100)) 1.1*max(imp(1:100))]);
% --------------------------------------------------------------------
function showImpulse(ud)
polepos=findobj(ud.pz_plot,'Tag','Pole');
zeropos=findobj(ud.pz_plot,'Tag','Zero');
len=max(length(polepos),length(zeropos));
pp=zeros(1,len); % pp=1e-10*rand(1,len);
for p=1:length(polepos)
ppos=get(polepos(p),'Position');
pp(p)=ppos(1)+ppos(2)*i;
end
zz=zeros(1,len); % zz=1e-10*rand(1,len);
for z=1:length(zeropos)
zp=get(zeropos(z),'Position');
zz(z)=zp(1)+zp(2)*i;
end
[b_k,a_k]=zp2tf(zz',pp',1);
function updateEq(handles)
a_n = [str2num(get(handles.a_n,'String'))];
b_n = [str2num(get(handles.b_n,'String'))];
fde = ['y[n] = ' num2str(b_n(1)) 'x[n] + '];
for i=2:length(b_n)
fde = [fde num2str(b_n(i)) 'x[n-' num2str(i-1) '] + '];
end
for i=2:length(a_n)
fde = [fde num2str(-a_n(i)) 'y[n-' num2str(i-1) '] + '];
end
fde = fde(1:end-2);
set(handles.equationbox,'String',fde);