DTMFDECODE(1) BSD Reference 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 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.
The command: dtmfdecode < beep.al will print a "1" to stdout.
ITU Recommendations G.711
The dtmfdecode utility was written by Poul-Henning Kamp <email@example.com>. This man page was written by Hellmuth Michaelis <firstname.lastname@example.org>. MirOS BSD #10-current February 15, 1999 1
Generated on 2013-04-27 00:20:00 by $MirOS: src/scripts/roff2htm,v 1.77 2013/01/01 20:49:09 tg Exp $
These manual pages and other documentation are copyrighted by their respective writers;
their source is available at our CVSweb,
AnonCVS, and other mirrors. The rest is Copyright © 2002‒2013 The MirOS Project, Germany.
This product includes material provided by Thorsten Glaser.
This manual page’s HTML representation is supposed to be valid XHTML/1.1; if not, please send a bug report – diffs preferred.