DTMF: Difference between revisions
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freq table |
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|+ DTMF keypad frequencies | |+ DTMF keypad frequencies | ||
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https://en.wikipedia.org/wiki/Dual-tone_multi-frequency_signaling | https://en.wikipedia.org/wiki/Dual-tone_multi-frequency_signaling | ||
== Goertzel == | == Goertzel == | ||
Revision as of 13:06, 19 September 2014
Intro
| 1209 Hz | 1336 Hz | 1477 Hz | 1633 Hz | |
|---|---|---|---|---|
| 697 Hz | 1 | 2 | 3 | A |
| 770 Hz | 4 | 5 | 6 | B |
| 852 Hz | 7 | 8 | 9 | C |
| 941 Hz | * | 0 | # | D |
https://en.wikipedia.org/wiki/Dual-tone_multi-frequency_signaling
Goertzel
https://en.wikipedia.org/wiki/Goertzel_algorithm