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![Two Pure Sine Waves combine for form the DTMF Tone for "1"[3] | Download Scientific Diagram](https://www.researchgate.net/publication/273075698/figure/fig1/AS:391834829377537@1470432111089/Two-Pure-Sine-Waves-combine-for-form-the-DTMF-Tone-for-13.png "Two Pure Sine Waves combine for form the DTMF Tone for \"1\"[3] | Download Scientific Diagram")
Two Pure Sine Waves combine for form the DTMF Tone for "1"[3] | Download Scientific Diagram
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