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DTMFDECODE(1) BSD General Commands Manual DTMFDECODE(1)
dtmfdecode -- decodes DTMF tones from A-law audio data
dtmfdecode is part of the isdn4bsd package and is used to detect DTMF tones in the audio
It reads audio G.711 A-law coded data from stdin and outputs the detected numbers values as
ASCII characters to stdout.
The detector is implemented as 8 narrow band-pass filters realized with an integer double-
cross recursive algorithm. Various ad-hoc methods are employed to provide hysteresis and
anti-bounce for the detected signals.
dtmfdecode < beep.al
will print a "1" to stdout.
ITU Recommendations G.711
The dtmfdecode utility was written by Poul-Henning Kamp <firstname.lastname@example.org>. This man page
was written by
Hellmuth Michaelis <email@example.com>.
BSD February 15, 1999 BSD
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