Fs = 22.5 kHz
There are two DTMF frequencies
F1 = [L0 L1 L2 L3] % four low frequencies
F2 = [H0 H1 H2 H3] % four frequencies
ocillator coefficients for example for L0
numerator = 1
denominator = [0.5 -cos(2*pi*L0/Fs) 0.5]
When you want to generate you input an impulse, also you need to adjust
in order to get the desired amplitude value. An expert here might point
out a better way
help wavwrite
cheers

Reply by Paul Russell●May 24, 20062006-05-24

haroon.khalil@gmail.com wrote:

> Can any body help me in writing code of following problem in MATLAB
> :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::�::::::::::::::::::::::
>
> Design digital oscillators for DTMF frequencies at sample rate of 22500
>
> sp/sec
> Generate a seven digit DTMF using Digital Oscillators and write it in a
>
> wav file
>

Which part are you having difficulty with ?
Paul

Reply by haro...@gmail.com●May 24, 20062006-05-24

Can any body help me in writing code of following problem in MATLAB
:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::=
=AD::::::::::::::::::::::
Design digital oscillators for DTMF frequencies at sample rate of 22500
sp/sec
Generate a seven digit DTMF using Digital Oscillators and write it in a
wav file