Index:
[(1)addftinfo(1)
addr2line(1)
afmtodit(1)
alias(1)
alloc(1)
apply(1)
apropos(1)
ar(1)
as(1)
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dtmfdecode(1)
du(1)
echo(1)
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ee(1)
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tee(1)
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truncate(1)
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users(1)
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uuencode(1)
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vacation(1)
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w(1)
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yyfix(1)
zcat(1)
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zdiff(1)
zegrep(1)
zfgrep(1)
zforce(1)
zgrep(1)
zmore(1)
znew(1)
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>. FreeBSD 5.4 February 15, 1999 FreeBSD 5.4
SPONSORED LINKS
Man(1) output converted with man2html , sed , awk