When the frequency response of a Dual Tone Multi-Frequency (DTMF) signals is plotted using the PWELCH function, the peak of the response doesn't correspond to exact frequency for which the signal is generated. For a DTMF signal, 2 peaks corresponding to 2 frequencies are obtained in the frequency response. However, the peaks are shifted from the original frequency. Why is there a shift in frequency?
MATLAB: Does the PWELCH function return an incorrect frequency response of a DTMF signal
dtmffrequencypwelchresponseshiftsignalSignal Processing Toolbox
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