DTMFDECODE(1) BSD General Commands Manual DTMFDECODE(1)NAME
dtmfdecode -- decodes DTMF tones from A-law audio data
SYNOPSIS
dtmfdecode
DESCRIPTION
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.
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
Check Out this Related Man Page
mlib_SignalALaw2uLaw(3MLIB) mediaLib Library Functions mlib_SignalALaw2uLaw(3MLIB)NAME
mlib_SignalALaw2uLaw - ITU G.711 m-law and A-law compression and decompression
SYNOPSIS
cc [ flag... ] file... -lmlib [ library... ]
#include <mlib.h>
mlib_status mlib_SignalALaw2uLaw(mlib_u8 *ucode, const mlib_u8 *acode,
mlib_s32 n);
DESCRIPTION
The mlib_SignalALaw2uLaw() function performs ITU G.711 m-law and A-law compression and decompression in compliance with the ITU (Former
CCITT) G.711 specification.
PARAMETERS
The function takes the following arguments:
ucode m-law code array.
acode A-law code array.
n Number of samples in the source array.
RETURN VALUES
The function returns MLIB_SUCCESS if successful. Otherwise it returns MLIB_FAILURE.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |Committed |
+-----------------------------+-----------------------------+
|MT-Level |MT-Safe |
+-----------------------------+-----------------------------+
SEE ALSO mlib_SignalALaw2Linear(3MLIB), mlib_SignalLinear2ALaw(3MLIB), mlib_SignalLinear2uLaw(3MLIB), mlib_SignaluLaw2ALaw(3MLIB), mlib_Signalu-
Law2Linear(3MLIB), attributes(5)SunOS 5.11 2 Mar 2007 mlib_SignalALaw2uLaw(3MLIB)
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