Does anyone know the details of dithering? Please help!

Discussion in 'Mastering' started by covenant66, Jan 17, 2006.

  1. covenant66

    covenant66 Guest

    I am writing in this forum to find out the details of dithering from 24/96 to 16/44.

    I have recently purchased an Apogee Rosetta 200, connected to an Echo Mona via S/PDIF (and the Echo is wordclock slaved to the Apogee). I record with Adobe Audition simply because I love the layout, and I have up to this point had positive experiences with it. It seems that the recording software really is more of a GUI preference than anything.

    Sooo... to dither (and use CODA) using the Apogee, do I play the file using the digital output as the output device and then record the digital input simultaneously? That seriously sounds like there could be some problems with that, won't something get lost in all that?

    Also, when you record simultaneously, Audition (and im assuming other software packages are the same) is set up to function in 24/96 mode. When you record the track, won't there be a problem there as well?

    I'm totally confused and I really need some help on this one.
     
  2. IIRs

    IIRs Well-Known Member

    I don't think that will work, as you would need to record one file at 16/44 at the same time as playing another file at 24/96. The only way I can think of for you to use the Apogee dither and SRC would be to record the 16/44 output with something else, such as a standalone CD burner or another computer with a proper spdif input. (Someone please correct me if I'm wrong..)

    Otherwise I suggest you use Audition to samplerate convert, then dither & truncate (using a good 3rd party dither plug if you have one available)
     
  3. Cucco

    Cucco Distinguished Member

    Ahhh, yet once again a reason why I love Sequoia -

    You can record and playback recordings in the same project with different bit depths and sample rates in real time. I don't know of anyother software package which will do the same.

    Furthermore, I don't know of any AD/DAs that will work asynchronous like that (though I might be totally wrong there). Usually, you set your sample rate/bit depth and away you go.

    IIRs reply is spot on - get an external CD burner with SPDIF input and use the Apogees (UV22HR) dither algorithm while going to disc.

    J.
     
  4. covenant66

    covenant66 Guest

    What do you mean asynchronous? Are you meaning you dont know of anything that will work with two different formats simultaneously?

    If that is what you meant then the Apogee most definately accepts a 24/96 input and outputs a 16/44 signal, how else could dithering possibly be accomplished?

    I will possibly try Sequoia. What is the learning curve on that software like?
     
  5. covenant66

    covenant66 Guest

    What do you mean asynchronous? Are you meaning you dont know of anything that will work with two different formats simultaneously?

    If that is what you meant then the Apogee most definately accepts a 24/96 input and outputs a 16/44 signal, how else could dithering possibly be accomplished?

    I will possibly try Sequoia. What is the learning curve on that software like?
     
  6. tamasdragon

    tamasdragon Guest

    If you are really, seriously interested in dithering, then go to http://www.digido.com , this is the web site of Bob Katz, there you can pick up the information. The best is to buy his book. It's a must have one.
    Regards Tamas Dragon
     
  7. Cucco

    Cucco Distinguished Member

    I guess I'm not that familiar with the Rossetta, but for it to accomplish this, you would need 2 seperate internal clocks (which I don't believe the Apogee has) and you would need a means on the unit to select the incoming sample rate and bit depth and the outgoing sample rate and bit depth (which again, the Apogee does not have).

    So, to accomplish dithering, you would need to likely slave the word clock to the incoming SPDF stream and then select on the front panel that you would like to output a 16 bit/44.1 kHz file using the Apogee's clock.

    I might be wrong (it's happened before, and I'm not that familiar with that unit), but to use the Apogee for the source clock on two different rates at the same time would be impossible. (Again, maybe I'm wrong...)

    J
     

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