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DTMFDECODE(1) BSD General Commands Manual DTMFDECODE(1)
NAME
dtmfdecode — decodes DTMF tones from A-law audio data
SYNOPSIS
dtmfdecode
DESCRIPTION
The dtmfdecode utility is part of the isdn4bsd package and is used to
detect DTMF tones in the audio stream.
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.
EXAMPLES
The command:
dtmfdecode < beep.al
will print a "1" to stdout.
STANDARDS
ITU Recommendations G.711
AUTHORS
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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