linear chirp signal generation ?
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hello i don't want to use chirp inbuilt function and i have written a code for chirp. could any one tell me is the code is correct ? i have simulate it and getting plot but at instantaneous time t1, I am not getting frequency change.
i have written a code according to equation of chirp signal generation.
please tell me this is correct ?
*****************************************
f1 =10;
f2 = 50 ;
t =0:0.001:20;
t1 = 10;
alpha = (f2-f1)/t1;
f= (alpha)*t + f1;
xx =1*cos(f);
plot (t,xx);
**********************************************
1 Commento
Neal Bambha
il 16 Dic 2019
This is not the correct expression for a linear chirped signal. See the wikipedia page for "Chirp" There is a t-squared term in the sine. Otherwise you will not have the correct spectrum
chirp_slope = (f2 - f1)/t(end);
chirp_signal = sin(2*pi*(0.5*chirp_slope*t.^2 + f1*t));
Risposta accettata
Youssef Khmou
il 5 Feb 2013
Modificato: Youssef Khmou
il 5 Feb 2013
hi, try this :
Fs=1000; % sample rate
tf=2; % 2 seconds
t=0:1/Fs:tf-1/Fs;
f1=100;
f2=400; % start @ 100 Hz, go up to 400Hz
semi_t=0:1/Fs:(tf/2-1/Fs);
sl=2*(f2-f1/2);
f1=f1*semi_t+(sl.*semi_t/2);
f2=f1(end)+f2*semi_t-sl.*semi_t/2;
f=[f1 f2];
y=1.33*cos(2*pi*f.*t);
plot(t,y)
To check the Amplitude spectrum (100Hz,400Hz), try my submission : http://www.mathworks.com/matlabcentral/fileexchange/40002-psd-power-spectral-density-and-amplitude-spectrum-with-adjusted-fft
6 Commenti
Atilla Golan
il 21 Gen 2018
Modificato: Atilla Golan
il 21 Gen 2018
Hi Youssef, Can we try up-going and down going chirp together? (without using chirp function on Matlab). In a time range of [1.2s 2.7s] (for example) my function should go up 0.6s (since 1.2s to 1.8s) and go down for the rest (since 1.8s to the end:2.7s). I mean in a constant frequency range, function goes up and down during time like quadratic chirp function but without using chirp.
Dhananjay Singh
il 25 Feb 2019
hi youssef,
the code you last sent doesn't work when i set the values of f1, f2 in Khz. can you help?
Più risposte (3)
REEM ALI
il 30 Gen 2014
please i want to generate triangular modulation sweep of fmcw of rx and tx
0 Commenti
farouk behar
il 11 Ago 2015
f = 150; a =5; w =2*pi*f; t =0:0.1:20; theta = pi/2; X = a*cos((w*t)+theta); y0 = X + 2*rand(size(t));
plot(t,y0)
0 Commenti
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