Dear All,
I'm a graduate student in Japan.
I need your help.
Though I had an example of low pass filter, I can't understand.
How dose this work? and How can I know cut-off frequency of this filter?
The original_data is a column of water quality data I obtained with 1Hz.
**********example***********
l = rows(original_data);
a = fft(original_data);
for i = (1:l)
if i >9
a(i) = 0;
endif
endfor
b = fft(ec);
for i = (1:l)
if i > 1
b(i) = 0;
endif
endfor
c = real(ifft(b));
c(1);
d = real(ifft(a))*2-c(1);
*********************************
If you have any idea, please help me.
Thank you,
Taketo Eguchi