A-Law 8 bit file on Mac

Discussion in 'Working with Sound' started by gogoth17, Oct 8, 2018.

  1. gogoth17

    gogoth17 Newbie

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    Hello,
    I am trying to convert a wav "normal" file into the WAV a-law format (for answering machine system - CCITT 8000hz, 8 bit, mono). I tried everyhting, form Sound Forge to Audacy from online free converters to 400$ demo software;
    Everytime, the 8-bit file is "transformed" into a 32 float bit file...
    The convertion is very easy to do using Windows XP or 7, just use the internal magneto.... but is it impossible to do on MacOs X ???
    Thanks for ideas or solution !!

     
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  3. davea

    davea Platinum Record

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  4. fiction

    fiction Platinum Record

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    a-law is a compander curve, not necessarily tied to bit depth or sample rate.

    I'm using sox myself all the time, and to convert a 16bit mono WAV file with 44100Hz to 8bit/8kHz/a-law you need something like this command:

    sox infile_mono_16bit_44k1.wav --encoding a-law --rate 8000 -b 8 outfile_mono_8kHz_alaw.wav

    To be able to do this on the command line, you'll have to install the sox for Mac binaries from
    https://sourceforge.net/projects/sox/files/sox/

    sox comes with a detailed man page too.

    If you don't know at all how to use the command line on MacOS, then I'm sorry I can't help.

    Bonne chance!
     
  5. tzzsmk

    tzzsmk Platinum Record

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    Best Answer
    are you using some more-than-10-year old obsolete Cisco stuff? then you'll need to use obsolete WXP in Parallels I guess
     
  6. fiction

    fiction Platinum Record

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    You wouldn't believe how much of this old stuff is still alive in production environments :woot:
     
  7. playtime

    playtime Kapellmeister

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    I second that :guru: I still do it on regular basis 5-6 times a year. Using Adobe Audition for that as it has built-in presets for CCIT A-Law and CCIT U-Law audio files.
     
  8. tzzsmk

    tzzsmk Platinum Record

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    believe me I know,
    my point is, you can use literally anything you need, in virtualized environment, in the long run it's a more convenient and reliable solution for enterprise target area ;)
     
  9. gogoth17

    gogoth17 Newbie

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    Thanks for your answers.
     
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