supress high amplitude signal and only keep low amplitude
4 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
i have a continuous positive signal which has a wave of high amplitude followed by a low aplitude i want to supress the high amplitude wave completely and only keep low amplitude signal
5 Kommentare
Youssef Khmou
am 5 Mär. 2013
Bearbeitet: Youssef Khmou
am 5 Mär. 2013
hi,@Wayne and @Juan : the Amplitudes are Completely added only if the signals have the same Frequency and same phase .
I reproduce Wayne s example ( modified ) :
t = 0:0.001:1-0.001;
x = 2*cos(2*pi*100*t);
y = 4*cos(2*pi*100*t-pi/8);
z = x+y;
plot(t,z)
x and y have the same Freq, but y contains a delay phase (pi/8) then Max(Z)=5.69 not 6 v .
Juan Camilo Medina
am 5 Mär. 2013
Bearbeitet: Juan Camilo Medina
am 5 Mär. 2013
OK, if the phases are different, the result is not exactly the same wave with amplitude equal to the sum of the other two waves. But still, the result is a "single" wave with the same frequency but shifted and different amplitude. If that is what you have, try a Fourier type sine-cosine basis functions decomposition:
t = 0:0.001:1-0.001;
a=5; phi=-1/8; f=10;
x = a*sin(2*pi*f*t+phi); % origial"mixed" wave
figure(1); clf; plot(t,x); hold on;
% decomposition into fourier basis functions
y = (a*sin(pi/2+phi))*sin(2*pi*f*t);
z = (a*sin(phi))*cos(2*pi*f*t);
plot(t,y+z,'--r')
Akzeptierte Antwort
Juan Camilo Medina
am 5 Mär. 2013
If they oscillate at different frequencies, you can create a high-pass filter, just read the help for the functions
[B,A] = butter(N,Wn,'high'); % this is just one of many filters types
Y = filter(B,A,X); % where X is your signal
0 Kommentare
Weitere Antworten (0)
Siehe auch
Kategorien
Mehr zu Signal Analysis finden Sie in Help Center und File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!