DTMF Generation with a 3.58 MHz Crystal

Posted on Jul 28, 2012

DTMF (Dual Tone Multiple Frequency) is associated with digital telephony, and provides two selected output frequencies (one high band, one low band) for a duration of 100 ms. DTMF generation consists of selecting and combining two audio tone frequencies associated with the rows (low band frequency) and columns (high band frequency) of a pushbutton touch tone telephone keypad.

DTMF Generation with a 3.58 MHz Crystal
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