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DTMF Tones 2.0
This App generates DTMF Tones of a 4x4 keypad and It can beusedinRobotics and Embedded Systems also . What isDTMF?Dual-tonemulti-frequency signaling (DTMF) is usedfortelecommunicationsignaling over analog telephone lines inthevoice-frequency bandbetween telephone handsets andothercommunications devices and theswitching center. The version ofDTMFthat is used in push-buttontelephones for tone dialing is knownasTouch-Tone. How it Works?The DTMF keypad is laid out in a4×4matrix in which each rowrepresents a low frequency and eachcolumnrepresents a highfrequency. Pressing a single key sendsasinusoidal tone for eachof the two frequencies. For example,thekey 1 produces asuperimposition of tones of 697 and 1209hertz(Hz). Initialpushbutton designs employed levers, so thateachbutton activatedtwo contacts. The tones are decoded bytheswitching center todetermine the keys pressed by the user.
