Dual-Tone Multifrequency Signalling Station

by Telekomm

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about

The DTMF telephone keypad is laid out as a matrix of push buttons in which each row represents the low frequency component and each column represents the high frequency component of the DTMF signal. The commonly used keypad has four rows and three columns, but a fourth column is present for some applications. Pressing a key sends a combination of the row and column frequencies. For example, the 1 key produces a superimposition of a 697 Hz low tone and a 1209 Hz high tone. Initial pushbutton designs employed levers, enabling each button to activate one row and one column contact. The tones are decoded by the switching center to determine the keys pressed by the user.

credits

released February 3, 2023

Generated at White Pillar, October 7, 2018. Photographer unknown / Design by ABM&D. This is Milieu Music number PNH-9.

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Telekomm Dayton, Ohio

en.wikipedia.org/wiki/Goertzel_algorithm

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