Интерактивная система просмотра системных руководств (man-ов)
dtmfdecode (1)
>> dtmfdecode (1) ( FreeBSD man: Команды и прикладные программы пользовательского уровня )
BSD mandoc
NAME
dtmfdecode
- decodes DTMF tones from A-law audio data
SYNOPSIS
DESCRIPTION
The
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
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 .
