pulse with modulation

how to implement the pulse with modulation with matlab

[Paulo Silva]

function sig=pwmgen(f,d,np)

%plot(pwmgen(100,0.5,4));axis([0 50 -2 2])

%f is the frequency of the pulses

%d is the dutty cycle (value from 0 to 1)

%np is the number of pulses

t=0:1e-3:np*1/f;

ton=d*1/f;

toff=(1-d)*1/f;

nton=find(((t>(toff-1e-3))) & (t<(toff+1e-3)));

ntoff=find(((t>(ton-1e-3))) & (t<(ton+1e-3)));

if ton==0, nton=0,end

if toff==0, ntoff=0,end

s=[ones(1,nton) zeros(1,ntoff)];

sig=repmat(s,1,np);

Answer 1

[Akira Agata]

If you have the Communications Toolbox, how about using commsrc.pattern ?