# why doesnt it work

11 views (last 30 days)
raad abzakh on 18 Jan 2022
Commented: David Hill on 19 Jan 2022
function x = ss_dtmf(number,dt,nd,np)
nl = length(number);
x = [];
t = 0:1:nd;
t = t*dt;
tp = 0:1:np;
xp = zeros(1,length(tp));
for i=1:nl
xi = ss_dtmf1(number(i),t);
x = [x,xi];
x = [x,xp];
end
end
Cris LaPierre on 18 Jan 2022
Functions must be called, so I'm asking how you are calling your function ss_dtmf? Specifically what are your input values for number, dt, nd, and np?
What error messages are you getting? Please copy and share all the red text.

David Hill on 18 Jan 2022
function x = ss_dtmf(number,dt,nd,np)
x=[];
for i=1:length(number)
x = [x,ss_dtmf1(number(i),0:nd:dt),ss_dtmf1(12,0:np:dt)];
end
end
function x = ss_dtmf1(n,t)
f=[941,697,697,697,770,770,770,852,852,852,941,941,0;1336,1209,1336,1477,1209,1336,1477,1209,1336,1477,1209,1477,0];
x=sin(2*pi*f(1,n+1)*t)+sin(2*pi*f(2,n+1)*t);
end
David Hill on 19 Jan 2022
This should do exactly what you want.
function x = ss_dtmf(number,dt,nd,np)
x=[];
lt=linspace(0,dt,nd);
lp=linspace(0,dt,np);
for i=1:length(number)
x = [x,ss_dtmf1(number(i),lt),ss_dtmf1(12,lp)];
end
plot(x);
end
function x = ss_dtmf1(n,t)
f=[941,697,697,697,770,770,770,852,852,852,941,941,0;1336,1209,1336,1477,1209,1336,...
1477,1209,1336,1477,1209,1477,0];
x=sin(2*pi*f(1,n+1)*t)+sin(2*pi*f(2,n+1)*t);
end
for example:
x=ss_dtmf([2 0 8 7 3 9 6 1 0 3],.1,1000,50);