Decadic Pulse Telephone and DTMF Telephone
DTMF - Wikipedia
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DTMF (Dual Tone Multiple Frequency)
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Dual Tone Multi Frequency (DTMF) - Signal Identification Wiki
What is DTMF (dual tone multi-frequency) and how does it work?
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What Is DTMF?
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DTMF
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DTMF - Wikipedia
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