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
DTMF using MATLAB
Started by ●May 24, 2006
Reply by ●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 ●May 24, 20062006-05-24
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