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This topic comprises 3 pages: 1 2 3
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Author
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Topic: SDDS / SRD reliability
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Tao Yue
Expert Film Handler
Posts: 209
From: Princeton, NJ
Registered: Apr 2001
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posted 06-06-2001 01:50 PM
You're absolutely right, Ken. I should not have said that "a waveform cannot possibly be reproduced exactly" (paraphrase of the impression that my earlier post erroneously gave), but rather "a waveform will not always be reproduced exactly." I gave linear interpolation of a sine wave as an example of a way in which digital audio can fail. I'm sure someone else can come up with a better example. The Nyquist Theorem states that no information will be lost if the sampling rate is twice the maximum frequency, but it doesn't say that you can actually do it. This is mathematical perfection, which doesn't exist in the real world.When you change from one form to another -- analog to digital, English to French -- you lose something. But, as you mentioned, there are "other things" that you can do to get closer to perfection. Is there an ideal low-pass filter? No. Is there something that's damn close? Yes. Likewise with the sinc filter. I still maintain that analog to digital and back will never be perfect because you're always trying to square a circle. The limit of this operation as our technical knowledge grows is a perfect square, but we'll never get to it. Eventually, though, we'll reach a point where the A-to-D conversion will surpass our ears' abilities to discern imperfections. And in that sense, I agree with you that digital audio can be "perfect" (to us).
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John Pytlak
Film God
Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000
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posted 06-06-2001 03:18 PM
Tao: Thanks for the link. The other items in that "Real Time Signal Processing" Course are also very good:
EE301: Real Time Signal Processing
Digital Signal Processing People like you and Evans Criswell bring back memories of my EE courses. Been there, done that (but not doing it right now). This great stuff is the foundation of digital imaging and digital sound. Lots of challenges to "Do Digital Right". ------------------
John P. Pytlak, Senior Technical Specialist
Worldwide Technical Services, Entertainment Imaging
Eastman Kodak Company
Research Labs, Building 69, Room 7419
Rochester, New York, 14650-1922 USA
Tel: 716-477-5325 Cell: 716-781-4036 Fax: 716-722-7243
E-Mail: john.pytlak@kodak.com
Web site: http://www.kodak.com/go/motion
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