DTMFDECODE(1) BSD General Commands Manual 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⟩. BSD February 15, 1999 BSD[top]
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