SRC from 96k 24bit to 16bit 44.1K ??????

Discussion in 'Mastering' started by anonymous, Jan 12, 2002.

  1. anonymous

    anonymous Guests

    Hi Brad,

    PT looks to go 96k any comments on the SRC needed to get'down' to make a normal CD??

    Pitfalls?

    Tips?

    :)

    Jules
     
  2. brad

    brad Guest

    ....
     
  3. Greg Malcangi

    Greg Malcangi Member

    Hi Jules,

    The rules won't really change, they'll just be modified a bit. The rule used to look like this:

    Record at the sample frequency of your final product. IE. If your final product is CD record and mix at 44.1kHz.

    The modified rule will look like this:

    Record at the sample frequency, or multiple of the sample frequency of your final product. IE. If your final product is CD record and mix at 44.1k, 88.2k or 176.4k.

    If say you've mixed at 88.2kHz, to get back to 44.1k all you have to do is apply the 44.1k brickwall filter and remove every other sample. At 176.4k you remove 3 out of 4 samples. At 96k or 192k the maths is nowhere near as simple to get back to 44.1k. This means quite a bit of processing is required and as we all know, the more processing involved the lower the apparent audio quality.

    BTW Jules, the new PT will allow sessions at the following sample frequencies in addition to 44.1k and 48k: 88.2k, 96k, 176.4k and 192k. All multiples of the original 44.1k and 48k sample frequencies.

    Greg
     
  4. brad

    brad Guest

    ....
     
  5. Greg Malcangi

    Greg Malcangi Member

    Hi Brad,

    with the better SRCs, this is not really an issue anymore.

    Agreed.

    It looks like there is a built in SRC in the new Digi 192 ADCs. Although I doubt very much if this SRC will measure up to the best of the dedicated boxes like the dB Tech 3000. I can't see the average PT user splashing out for a quality dedicated SRC if they already have this feature, albeit probably at a lower quality.

    So Jules, on advice from Brad here is the modified, modified rule:

    Record at the sample frequency, or multiple of the sample frequency of your final product. IE. If your final product is CD record and mix at 44.1k, 88.2k or 176.4k. If you have a high quality SRC box then record at any sample frequency you want and smile smugly at all the poor sods who can't afford one! :)

    Greg
     

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