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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.

     The command:

	   dtmfdecode < beep.al

     will print a "1" to stdout.

     ITU Recommendations G.711

     The dtmfdecode utility was written by Poul-Henning Kamp <phk@freebsd.org>.  This man page
     was written by
     Hellmuth Michaelis <hm@freebsd.org>.

BSD					February 15, 1999				      BSD
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