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What is the full form of DTMF?

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What is the full form of DTMF?

(a) Dual-Tone Multi frequency

(b) Dual Telephony Multiple Frequency

(c) Dual-Tone Minimum Frequency

(d) Digital Tone Minimum Frequency

I have been asked this question during an online exam.

This intriguing question comes from Transmission Bandwidth topic in section Angle Modulation of Analog Communications

1 Answer

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Correct choice is (a) Dual-Tone Multi frequency

Easiest explanation: DTMF is an in-band telecommunication signal. It uses the voice-frequency band over telephone lines. It was developed by Bell Systems in United States.

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