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-.\"
-.\" Copyright (c) 1999 Hellmuth Michaelis.  All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\" $FreeBSD$
-.\"
-.\"	last edit-date: [Mon Apr 26 13:42:15 1999]
-.\"
-.\"
-.Dd February, 15 1999
-.Dt DTMFDECODE 1
-.Os
-.Sh NAME
-.Nm dtmfdecode
-.Nd decodes DTMF tones from A-law audio data
-.Sh SYNOPSIS
-.Nm
-.Sh DESCRIPTION
-.Nm dtmfdecode
-is part of the isdn4bsd package and is used to detect DTMF tones in the
-audio stream.
-.Pp
-It reads audio G.711 A-Law coded data from stdin and outputs the detected
-numbers values as ASCII charcters to stdout.
-.Pp
-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.
-.Sh EXAMPLES
-The command:
-.Bd -literal -offset indent
-dtmfdecode < beep.al 
-.Ed
-.Pp
-will print a "1" to stdout.
-.Sh STANDARDS
-ITU Recommendations G.711
-.Sh AUTHORS
-The
-.Nm
-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 .