Would it be possible to create an inaudible Digital Timecode?


    Dec 21 2009 | 8:17 pm
    I'm wondering if this would be possible - to add a layer of inaudible timecode to a digital file which could be decoded at playback by Max.
    Might sound like a strange request but I am wondering if this could be a way of timestretching clips and yet retaining the original position of each portion of audio.
    In this way I could warp a video files in Ableton Live and use M4L to play the relevant portion of the video file.
    Although my ultimate aim is related to Live/M4L I thought this forum was as good as any to post as it is a general audio/Max question.
    If anyone has any input it would be great

    • Dec 21 2009 | 8:41 pm
      well im not sure, but you are limited by your sampling rate to what you can add where.. i dont see why you couldnt look at adding some information above the audible hearing range, but i think you'd have to be careful of adding unit impulses, im a bit rusty but i think they dont necessarily manifest as just a unit impulse.
    • Dec 21 2009 | 10:09 pm
      I don't really know anything about it, but there are digital watermarking techniques that perhaps could be used to do something like this.
      Hopefully you are at a University or there is a library near by you to get it free.
    • Dec 22 2009 | 9:42 am
      Very interesting papers around the web about Dither modulation, indeed. Thanks for the link, roth.