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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 .

     

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    NAME
    SYNOPSIS
    DESCRIPTION
    EXAMPLES
    STANDARDS
    AUTHORS

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