Error using plot !

Question

Osman osmanavci 2020-5-7

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/523870-error-using-plot

回答： Tommy 2020-5-7

sinyal=audiorecorder(44100,16,1);
disp('start speaking')
recordblocking(sinyal,5);
play(sinyal);
myrec=getaudiodata(sinyal);
audiowrite('ses.wav', myrec, 44100);
z=myrec
figure               
voicefft = fft(z);
magnitude=abs(voicefft);
anglefft=angle(voicefft);
magx=max(magnitude);
subplot(211);
plot(abs(voicefft));
title('magnitude');
subplot(212);
plot(unwrap(angle(voicefft)));
title('phase');
f=10000;
Amp=2;
fs = 44100;
ts=1/44100;
T=5;
t=0:ts:T;
y=Amp*sin(2*pi*f*t);
x1=y';                             
y_noisy=z+x1(1:length(z));
figure               
noisyfft = fft(z);
magnoisy=abs(noisyfft);
anglenoisy=angle(noisyfft);
subplot(211);
plot(abs(noisyfft));
title('magnitude');
subplot(212);
plot((angle(noisyfft)));
title('phase');
figure
plot(t,z);
xlim([0 0.004]);
figure
plot(t,y_noisy);
xlim([0 0.004]);
figure
plot(t,y);
xlim([0 0.004]);
figure
plot(abs(z));
xlim([0 200]);
figure
plot(angle(z));
xlim([0 200]);
figure
plot(abs(y_noisy));
xlim([0 200])
figure
plot(angle(y_noisy));
xlim([0 200]);
audiowrite('bozukses.wav', y_noisy, 44100);
nfilt = 70;
Fst = 9000;
d = designfilt('lowpassfir','FilterOrder',nfilt, ...
               'CutoffFrequency',Fst,'SampleRate',fs);
           
xf = filter(d,y_noisy);
plot(t,xf,'-r','linewidth',1.5);
title 'Electrocardiogram'
xlabel 'Time (s)', legend('Original Signal','Filtered Signal')
grpdelay(d,f,fs)
delay = mean(grpdelay(d))
tt = t(1:end-delay);
sn = z(1:end-delay);
sf = xf;
sf(1:delay) = [];
plot(tt,sn);
plot(tt,sf,'-r','linewidth',1.5);
title 'Electrocardiogram'
xlabel('Time (s)'), legend('Original Signal','Filtered Shifted Signal')