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Why Sine waves are only choosen for the generation of DTMF

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krishna3d

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Why Sine waves are only choosen for the generation of DTMF tones why havent they opted for square wave or other waveforms is there any reason or its just a standard.
 

Re: Why Sine waves are only choosen for the generation of DT

The square waves have harmonics. The harmonics of the low band frequencies are in the high band frequencies and can hamper the decoding of the high band frequencies.
 

Re: Why Sine waves are only choosen for the generation of DT

There have a limited bandwidth allocated for the voice band by telephone company. So, if we use square wave, it will cause some misdetection.
 

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