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In Reply to: Coming closer to agreement, maybe posted by Max on February 21, 2005 at 06:25:43:
*** Therefore, the 24-bit version will be measurably superior regardless of the quality of the source. ***Not significantly if the noise level of the source is high - that's why i suggested you do a double blind test. We are talking about less than 0.ldB difference between 16- and 24-bits for your original example (output of CD player, not your artifical 8 bit example).
The 24-bit version will only make an audible difference if source noise level was significantly below -90dB or so - which rules out the analog output of a CD player through a preamp. It still doesn't give you any basis for saying i have "faulty logic". Besides, i am still waiting for your double blind testing results.
*** When I talk about converters dithering, I mean complete finished pro-grade products, not chips. ***
Doesn't matter. Still doesn't make engineering sense.
*** Dither removes distortion ***
No, dither adds distortion.
*** If a converter has (say) 24-bits of internal precision, why not use it, even for 16-bit output? It can only be beneficial. ***
Why would it be beneficial? Assuming that you want 16-bit output, why decimate to 24-bits and then take an additional step to convert to 16-bits? Makes no sense (unless you are wanting to apply noise shaping - but that's best done post A/D) and has the risk of introducing downconversion artefacts.
Anyway, sigma delta converters do *not* have 24-bits of internal precision. That's the flaw in your thinking. The precision of a converter is the accuracy of the sigma delta modulation (which is usually 128fs and 1-5 bits of accuracy). The output setting (16-, 20-, 24-bits) is just an accumulator - just because it's capable to being as wide as 24-bits doesn't mean that's the "native" accuracy. in fact, no AD converter is capable of full 24-bit precision - the specs would suggest around the equivalent of 20 or so bits accuracy at the most.
But as i've said before, all this is irrelevant, and even if you are right it weakens your original case that my "logic" was faulty (not that you had any basis in the first place). You seem to have stop defending your original point, and i've yet to see those blind test results. Why don't you give it a rest?
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Follow Ups
- Re: Coming closer to agreement, maybe - Christine Tham 13:01:40 02/21/05 (5)
- Re: Coming closer to agreement, maybe - Max 14:59:37 02/21/05 (4)
- Re: Coming closer to agreement, maybe - Christine Tham 23:54:15 02/21/05 (3)
- Re: Coming closer to agreement, maybe - Max 05:01:07 02/22/05 (2)
- still waiting for the validated double blind tests - Christine Tham 12:40:21 02/23/05 (1)
- some explanation to help you understand why your point about "boosting" is invalid - Christine Tham 18:38:03 02/23/05 (0)
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