Technology
Why every keypad button plays two tones
HERE’S THE INTERESTING PART
Every time you press a button on a keypad, you're dropping a microscopic musical chord. Dual-Tone Multi-Frequency (DTMF) signaling assigns a specific high frequency and low frequency to every row and column on the keypad. Pressing a number plays both corresponding tones at the exact same time, preventing the system from confusing the sound with random background noise.
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