In Reply to: Re: Hi Ted. posted by Ted Smith on August 23, 2003 at 07:24:03:
""Cool Edit Pro (and your DAC) have no idea what waveform I gave, but the peak is reconstructed accurately from the samples present.""TEDTed...try presenting it the samples from .19625 to .19655 only.
Bet it doesn't give you the correct peak..
Looked at the notation you provided..fraid I'm clueless as to what it says..my fault, not yours..
What is the math cool edit pro uses to reconstruct the underlying waveform? is it the same math that is applied to the output of a CD??
At first, I had thought the oversampling techniques did that, but apparently not.
""Anyway go listen to your 14kHz sampled and reconstructed at 32k, 44.1k, 48k, 96k, etc. They all sound the same to my ears and have the same amplitude.""ted
The only thing I have to play it back on here is cd type stuff..so I can't yet do that..My newer 24/192k card may support that, but it's still in the box..I think I'll just build a new computer around it instead of the infernal problem of "new hardware found".
""It also agrees with theory.""ted
In theory, yes..but the application is not up to the theory. My DSP prof's never used truncated signals to support nyquist. They did, however, show how truncated signals cannot provide optimal reconstruction. Some kind of convolution between the sampling window and the signal of interest, from what I recall..definitely fuzzy on that, though.
""Why would I believe your eyes instead of mine and my ears and the theory? :)""ted
Ummmm because I'm such a nice guy???. :-)
A really cool test of what we speak? Take the pure file, .wav it, play it into a typical CD player, and scope it..Then use a parametric set high Q, look for the artifacts I see with my eyes..by scanning the parametric across the 500 hz to 5 k range.
You're correct..It's my eyes here, not my ears..And I also think I wouldn't hear a diff over the rates..
I love this crap....
Thanks Ted,
John
BTW, does 25 dollars get me the ability to put pics on AA? Cause I really like AR for that capability.
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Follow Ups
- Re: Hi Ted. what you do??edit a typo? - jneutron 07:44:47 08/23/03 (9)
- Re: Hi Ted. what you do??edit a typo? - Ted Smith 08:09:33 08/23/03 (8)
- Re: Hi Ted. what you do??edit a typo? - jneutron 09:13:54 08/23/03 (7)
- Re: Hi Ted. what you do??edit a typo? - Ted Smith 09:41:40 08/23/03 (6)
- Re: Hi Ted. what you do??edit a typo? - jneutron 10:28:39 08/23/03 (5)
- Re: Hi Ted. what you do??edit a typo? - Ted Smith 11:25:20 08/23/03 (4)
- What's confusing to most people about this - Commuteman 17:37:13 08/23/03 (2)
- Re: What's confusing to most people about this - Ted Smith 19:13:42 08/23/03 (1)
- Re: What's confusing to most people about this - jneutron 07:47:01 08/25/03 (0)
- Re: Hi Ted. what you do??edit a typo? - john curl 13:20:02 08/23/03 (0)