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How to generate up chirp and down chirp signal in Matlab?

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electroon

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hi
iam engineering fianl year student please help me in my project
i want to generate upchirp and down chirp signal in matlab without using inbuilt matlab function "chirp" i want to write the code to do that can anyone help me please..
 

plz help

Search your MATLAB installation directory for file chirp.m. It contains the source code of the chirp function.
 

electroon said:
hi
iam engineering fianl year student please help me in my project
i want to generate upchirp and down chirp signal in matlab without using inbuilt matlab function "chirp" i want to write the code to do that can anyone help me please..
Click to expand...

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);
figure
plot(t,y);
z=fft(y);
figure
plot(z);
 

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