Manual browser: dtmfdecode(1)
|DTMFDECODE(1)||General Commands Manual||DTMFDECODE(1)|
NAMEdtmfdecode — decodes DTMF tones from A-law audio data
DESCRIPTIONdtmfdecode 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.
dtmfdecode < beep.al
will print a "1" to stdout.
STANDARDSITU Recommendations G.711
AUTHORSThe dtmfdecode utility was written by <firstname.lastname@example.org>. This man page was written by <email@example.com>.
|February 15, 1999||NetBSD 7.0|