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Originally Posted by Dan Lavry  The thread title is about higher sample rate and SNR. I do not see how dither got in here. |
Hi Dan,
When you enter into discussions like this it's a good idea to remember that the other people are often less knowledgable than you, so they may be mssing stuff out or getting terminology wrong, as such a little effort to "read between the lines" to work out what is really being talked about can really help things go more smoothly.
It doesn't take a genius to work out that whatever termnology is used what Bob Katz and the Original Poster are talking about is oversampling, even if perhaps Bob isn't fully aware of it himself. What anyone who's either read a little on the subject, or thought about the DC level scenario I gave above will know is that for oversampling to give the 6dB resolution improvement with 4 x oversampling, dither is essential.
Since the OP categorically and incorrectly stated that the effect was not limited to a dithered system, that's raised a couple of questions from other people here... so that's where dither got in here.
Of course as you've pointed out the other glaring mistake made by the OP is to reject the real world issues of the input signal and the noise you get in analogue circuitry which makes this theoretical advantage completely useless when choosing a sample rate for your DAW.
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If dither and noise shaping is the subject of interest, then I recommend reading my paper "Do you need 20 bits" on my company site.
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To everyone else : Dan's white papers are very good, I recommend them.