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Area of a signal

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Julio Martín
Julio Martín 2022-2-13
评论： Julio Martín 2022-2-16
Hi, need to find area of an emg signal
With this code:
for c=2:2
A=strcat('S1_',num2str(c));
B=strcat(A,'.emt');
D=importdata(B,'\t',12);
[F, C]=size(D.data);
x=filter(Filtro_emg,D.data);
centro=(F-mod(F,2))/2;
x=x((centro-4000)+133:(centro-4000)+483,:);
RMS = Rms_emg (x,100)*1000;
S=smoothdata(RMS);
figure
for b=3:3
plot(S(:,b));title('Tibial anterior');grid;xlabel('Tiempo mseg');ylabel('uV');
AreaGM1=sum(S(:,b));
end
end
I have a result of 42756.251 uV (I supose it's impossible in a time of 350 miliseconds-line 8). If x is time in miliseconds, how could I add it in my code?
Thank you so much
  2 个评论
AndresVar
AndresVar 2022-2-14
编辑：AndresVar 2022-2-14
What are the units of S?, if S is in uV, then actually your area is 42756.251 uV*ms?
if x is in miliseconds and dx = 1 ms then i suppose your sample rate is uniform 1kHz
area = sum(dS*dt)=sum(dS)*dt~sum(S)*1ms
Julio Martín
Julio Martín 2022-2-14
Hi Thanks, don’t know what you mean with d or dt, none of my variables has that name Thanks

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KSSV
KSSV 2022-2-14
Read about trapz.

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