Question

Implement the function "triangl.m":

function y=triangl(t)
y = (1-abs(t)).*(t>=-1).*(t<1);
end

a) Plot time versus baseband signal (m_sig)

b) Plot freq versus baseband signal spectrum (M_fre)

I've created and saved the function "triangle.m", however, I'm unsure how to implement it for parts a) and b) in MATLAB.

Answer 1

MATLAB CODE:

t=-2:0.01:2;
m_sig=triangl(t);
figure(1);
plot(t,m_sig)
xlim([-4 4])
ylim([0 1.5])
xlabel('time','Fontweight','bold');
ylabel('signal','Fontweight','bold');

fs=100; %sampling frequency=fs>2*fmax
y=fft(m_sig);
n=length(m_sig);
f=(0:n-1)*(fs/n);
power = abs(y).^2/n;
figure(2);
plot(f,power);
xlim([-10 150])
ylim([0 30])
xlabel('frequency','Fontweight','bold');
ylabel('spectrum','Fontweight','bold');

function y=triangl(t)
y = (1-abs(t)).*(t>=-1).*(t<1);
end