DTMF Tones
This App generates DTMF Tones of a 4x4 keypad and It can be used in Robotics and Embedded Systems also .
What is DTMF?Dual-tone multi-frequency signaling (DTMF) is used for telecommunication signaling over analog telephone lines in the voice-frequency band between telephone handsets and other communications devices and the switching center. The version of DTMF that is used in push-button telephones for tone dialing is known as Touch-Tone.
How it Works?The DTMF keypad is laid out in a 4×4 matrix in which each row represents a low frequency and each column represents a high frequency. Pressing a single key sends a sinusoidal tone for each of the two frequencies. For example, the key 1 produces a superimposition of tones of 697 and 1209 hertz (Hz). Initial pushbutton designs employed levers, so that each button activated two contacts. The tones are decoded by the switching center to determine the keys pressed by the user.
What is DTMF?Dual-tone multi-frequency signaling (DTMF) is used for telecommunication signaling over analog telephone lines in the voice-frequency band between telephone handsets and other communications devices and the switching center. The version of DTMF that is used in push-button telephones for tone dialing is known as Touch-Tone.
How it Works?The DTMF keypad is laid out in a 4×4 matrix in which each row represents a low frequency and each column represents a high frequency. Pressing a single key sends a sinusoidal tone for each of the two frequencies. For example, the key 1 produces a superimposition of tones of 697 and 1209 hertz (Hz). Initial pushbutton designs employed levers, so that each button activated two contacts. The tones are decoded by the switching center to determine the keys pressed by the user.
Category : Education
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Reviews (7)
Chr. C.
Aug 13, 2019
Made a Skype call and used this keypad asna solution to navigate an automated call system. This was used to resolve am issue with Skype. Thanks to the devwlopment team!
Jer. T.
Jul 2, 2019
The inclusion of the A B C and D tones were exactly what I was looking for, and worked great.
Mii. C.
Jun 26, 2020
Cool to have abcd tones, BUT. Slow startup and freezes a lot.
Pet. R.
Apr 9, 2020
Does not help me in touch tone menus
Dav. T.
Mar 29, 2019
not much to it cant do anything my keypad cant do
gre. m.
Jun 4, 2021
The application does exactly what it describes, generates a dtmf tone. Useful for my application.
Slow startup, and does not tone until key is released. Each tone is a short blip. It would be nice for the tone to be for the duration of the keypress as the key is touched.