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Dual Frequency, Touch-Tone

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Dual Frequency, Touch-Tone

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Touch-Tone :Frequency analysis with FFT.

Fourier_analysis.m
% Fourier analysis : touch tone
% File for testing the Dual frequencies :
Fs=32768;            % Sampling rate 
t=0:1/Fs:0.25;       % time points 
fr=[697 770 852 941];%Basic frequencies 
fc=[1209 1336 1477];
y1=sin(2*pi*t*fr(1));
y2=sin(2*pi*t*fc(1));
one=(y1+y2)/2;

n=ceil(log2(length(one)));
nfft=2^n;
%spectrogram(one,128,120,nfft,Fs)

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