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In Reply to: 10khz "square-wave" test? Nonsense! posted by Martin says on March 10, 2002 at 16:26:29:
The rise time for a square time is (theoretically) instantaneous, so all any system, PCM or DSD, could do is sample that first intial zero to five volt transition, then..........I get confused at this point. That first "side" of the square wave can't be sampled--it is already at its uppermost limit at the instant (theoretically) it began. No sampling rate of any rate could possibly keep up with it. I think it would have to be infinitely fast, and not even analog electronics are capable of that.But once on the "flat top" of the wave, I guess a analog-to-digital converter could accomplish some sampling......and a high rate sampler would make the first sample earlier than a slower one I guess, resulting in a, relatively speaking, squarer(?) wave when converted back to analog. It couldn't be truly square, though.
And a small detail Sony fails to mention: music does NOT contain any square waves. Even if DSD reproduces a better, less round, square wave, 1) How much squarer is it than the 192kHz (or even 96kHz) PCM version: 50%, 25%, or just 1%?????? and mainly 2) Who cares?!?!!
And the sampling rate system for DSD still has never been cleanly and simply explained--I even keep reading from sacd people that it's 2.4mHz rate is not really usable when comparing to PCM's sampling system, since DSD and PCM aren't the same thing: I keep seeing figures like it's only 4X redbook CD's, or just a little more than PCM's 192/24 rate. This has also been hinted at in several magazines.
DSD is supposed to be this elegant and simple digital format--if it's so simple, why all the long and convoluted explanations of its inner workings?
So where is the ELEGANT and SIMPLE explanation?
I'll conclude with this classic concept:
"If you can't dazzle them with brilliance, baffle them with bullshit."
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Follow Ups
- Puzzled by this "test" also. - waVeman 20:53:31 03/10/02 (13)
- more whining - tunenut 21:47:41 03/10/02 (12)
- And ANOTHER typical avoidance tactic by DSD believers is rolled out! - waVeman 00:54:28 03/11/02 (11)
- you are right - tunenut 09:38:03 03/11/02 (0)
- See, it wasn't THAT hard, now was it??? N/T - waVeman 16:55:05 03/11/02 (0)
- Re: you are right . . . - Martin says 10:57:39 03/11/02 (0)
- not quite correct - tunenut 11:11:04 03/11/02 (0)
- I wasn't implying that there was a "sample & hold" with DSD . . - Martin says 11:29:53 03/11/02 (0)
- So.................. - waVeman 17:16:40 03/11/02 (3)
- the advantages are implementation issues - tunenut 18:40:41 03/11/02 (2)
- Re: the advantages are implementation issues. . . - Martin says 07:36:52 03/12/02 (1)
- . . . And for those who didn't know, "multibit" DACs use PCM {n.t.} - Martin says 07:44:18 03/12/02 (0)
- agree with you, mostly - tunenut 13:15:14 03/11/02 (0)
- Think of it this way... - Ted Smith 12:35:56 03/11/02 (0)
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