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What is DTMF (dual tone multi-frequency) and how does it work?
Controlling a Robot Using DTMF Tones: A Project to Remotely Operate a Robot Through Dual-Tone Multi-Frequency Decoding on a Mobile Phone, PDF, Electronic Filter
USE IVR for start intents
What is DTMF? - Dual Tone Multi-Frequency
Technology Media and Telecoms - CX Today
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Detecting Dual Tone Multi Frequency Signals — sparse-plex v2019.02
Black DTMF Decoding Algorithm
DTMF - Wikipedia
Chapter 12 Case Studies in Digital Signal Processing. - ppt download
What Is Dual-tone Multi-frequency? - Desku
IVA, IVR, Chatbot? What's the difference?
Fourier Analysis. Chapter Touch-Tone Dialing - PDF Free Download