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DTMFDECODE (1) | General commands | Unix Manual Pages | :man

NAME

dtmfdecode - decodes DTMF tones from A-law audio data

CONTENTS

Synopsis
Description
Examples
Standards
Authors

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


.An -nosplit The dtmfdecode utility was written by
.An Poul-Henning Kamp Aq
phk@FreeBSD.org . This man page was written by
.An Hellmuth Michaelis Aq hm@FreeBSD.org .

February 15, 1999 DTMFDECODE (1)
shtml">manServer 1.07 from dtmfdecode.1 using doc macros.


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