DTMF Decoder1.11.1 - App Store
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Official App Store Link
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Publisher Description
Turns your iPhone into a simple DTMF decoder. Simply hold the iPhone's microphone near to a clear source of DTMF tones (telephone "Touch Tones") and it will display the numbers being dialed. The decoded digits are also placed into a text area from which you can copy them to the clipboard.
See it in action here:
https://www.youtube.com/watch?v=l_QD8KFCJPw
Source code freely available:
https://github.com/veghead/ios-dtmf-decoder
Version History Rebuild for OS11+. 1.11.1 08/09/2023 Rebuilt for iOS 11+ 1.11.0 08/02/2023 Restored the ability to capture tones when the app is in the background. 1.8.2 01/24/2017 Reworked for iOS 10. A textview has been added for decoded digits - not only does this allow a longer string of digits to be displayed, it also allows copying to the clipboard directly. 1.8 12/20/2016 Replaced the detection engine entirely - now much more sensitive and accurate. Added the ability to copy detected tones to the clipboard. Added a settings page that allows altering detection parameters. Brighten "LEDs".
Source code now available under GPL! 1.5 09/29/2010 1.0 02/25/2009