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Built-in Signal Processing
Power Spectrum of a Dual-Tone Multi-frequency (DTMF) Signal
Compare power spectra of keys 1 and 8 on a dial pad.
In[1]:=
X
data = {Table[ Sin[2 Pi 697 t] + Sin[2 Pi 1209 t] + RandomReal[{-0.02, 0.02}], {t, 0., 0.1, 1/8000.}], Table[Sin[2 Pi 852 t] + Sin[2 Pi 1336 t] + RandomReal[{-0.02, 0.02}], {t, 0., 0.1, 1/8000.}]};
In[2]:=
X
Periodogram[data]
Out[2]=
