jens
b31f3e7435
git-svn-id: http://moon:8086/svn/matlab/trunk@153 801c6759-fa7c-4059-a304-17956f83a07c
66 lines
1.4 KiB
Matlab
Executable File
66 lines
1.4 KiB
Matlab
Executable File
% pltimp(x,Fa,Nw,NP)
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function y = pltimp(x,Fa,Nw,NP)
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xn = x(1:NP)/max(x(1:NP));
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Px = sm2(xn(1:NP).^2,Nw,0);
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Pxn = Px/max(Px(1:NP));
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PxndB = 10*log(Pxn(1:NP));
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matchval = -120;
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for n = 1:NP,
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if ((PxndB(n) <= -60) & (PxndB(n) > matchval))
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matchn = n;
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matchval = PxndB(n);
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end;
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if (PxndB(n) > -60)
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matchval = -120;
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end;
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end;
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matchtime = matchn*1000/Fa
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matchval
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figure;
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plot(1000*(1:NP)/Fa,x(1:NP));
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grid;
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PlotTitle = sprintf('h(t) Fa=%d Hz',Fa);
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title(PlotTitle);
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xlabel('t [ms]');
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ylabel('h');
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figure;
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plot(1000*(1:NP)/Fa,Px(1:NP));
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grid;
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PlotTitle = sprintf('Leistung Ph(t), Windowsize=%d Samples, Time=%g ms',Nw,1000*Nw/Fa);
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title(PlotTitle);
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xlabel('t [ms]');
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ylabel('eh');
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figure;
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plot(1000*(1:NP)/Fa,PxndB(1:NP));
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set(gca,'YTick',-20*(0:6));
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xt = get(gca,'XTick');
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rval = 100;
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di = 1;
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for i = 1:length(xt)-1,
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lv = round(matchtime) - xt(i);
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if (lv <= 0)
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di = i;
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if (i > 1)
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uv = round(matchtime) - xt(i-1);
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if (abs(uv) < abs(lv))
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di = i - 1;
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end;
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break;
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end;
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end;
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end;
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di
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xt(di) = matchn*1000/Fa;
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set(gca,'XTick',xt);
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grid;
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PlotTitle = sprintf('Leistung Ph(t) 60dB-decay time=%g ms',matchtime);
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title(PlotTitle);
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xlabel('t [ms]');
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ylabel('Ph [dB]');
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