DTMF Tone Generator

Introduction to DTMF tones

Dual-Tone Multi-Frequency (DTMF) is the signal that you generate when you press an ordinary telephone's touch keys. Over the years, DTMF has replaced Pulse dialing, the early type of telephone dialing in which short pulses were used to relay the dialed number. With DTMF, each keypress on your phone generates tones made of two specific frequencies.

	1209 Hz	1336 Hz	1477 Hz	1633 Hz
697 Hz	1	2	3	A
770 Hz	4	5	6	B
852 Hz	7	8	9	C
941 Hz	*	0	#	D

The frequencies were chosen to avoid harmonics : no frequency is a multiple of another, the difference between any two frequencies does not equal any of the frequencies, and the sum of any two frequencies does not equal any of the frequencies. Although DTMF works in normal human voice range, the combination of inharmonic frequencies makes it hard for the human voice to impersonate.

Although mobile phone networks use digital signals instead of DTMF for direct dialing, DTMF is still used over mobile phones to navigate automated systems such as phone menus, voice menus and other advanced calling services.

DTMF Generator

Waveform ..... DTMF Input ........ 0~9 A~D * # space (pause) Max. Input ... 99 digits Duration ..... 100 ms (digit) 1 s (pause) Level ........ -1 dBFS Sample Rate... 8kHz Output ....... Uncompressed .wav file (16bit) downloaded to disk

Type your keypad sequence here :

External Links

• DTMF @ Wikipedia