What if they took a 16 bit file and put it in a 24 bit container while adding 8 LSB of dither? A bitscope wouldn't help you there, would it? If the noise floor sometimes drops below the 16th bit, I could maybe see that the noise floor hovering right at 16 bits would be a clue. But if the noise floor never drops below the 16th bit, then how would you know whether the bottom 8 bits is program or dither? I suppose that, if there is a fade-out, if the dither remains at 16 bits, that would also be a clue, unless they added the dither before the fade. Ellis On Mon, May 5, 2014 at 10:32 AM, [log in to unmask] <[log in to unmask]>wrote: > Henry Borchers: > > > I have some doubts about a file being digitized at true 24-bit. > > The file says 24-bit but I?m not sure how to verify it. Is there > > a way of verifying a file to see if it?s truly 24-bit and not 16-bit > > conversion in a 24-bit file? > > Yes, you need to use a bitscope to see which bits toogle or are > stuck with no activity in them. > > I use an ADT, England, Digital line tester where you can see the > status of the AES/EBU user bits and you can also manipulate > those bits any way you wish. > > I have modified it so I can also use it as a bitscope which can be > very useful as in the past there were many pieces of didgital > equipment that claimed to be 24 bits but could be anywhere from > true 24 bits down to 16 bits. > > The Valley Audio 730 Comp/limiter stated 24 bis but was in fact > a 16 bit device only. > > There are many more devices that you can use as a bitscope from > Prism and many manufacturers that sell you software has a bitcope > included. > > If you are handy you can even build your own as is shown here: > > > http://www.digido.com/articles-and-demos12/13-bob-katz/18-digital-detective.html > > > -- > Best regards, > > Goran Finnberg > The Mastering Room AB > Goteborg > Sweden > > E-mail: [log in to unmask] > > Learn from the mistakes of others, you can never live long enough to > make them all yourself. - John Luther > > (\__/) > (='.'=) > (")_(") Smurfen:RIP > -- Ellis [log in to unmask] 818-846-5525