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Dual-tone multi-frequency signaling - Wikipedia
Dual-Tone Multi-frequency Signaling (DTMF | Telecommunications | Telephony
Power Spectrum of a Series of Dual-Tone Multi-frequency (DTMF) Signals
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What is DTMF (dual tone multi-frequency) and how does it work?
How to Generate and Detect Dual Tone Multi-Frequency (DTMF) Signals
Dual-tone multi-frequency signaling | Semantic Scholar