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In Reply to: RE: 'IMO, SPDIF from a computer would be the last method of connectivity to use as far as digital connections. posted by maabx on March 19, 2008 at 20:23:43:
I read the test results on these de-jittering devices. Not very good results IMO. It seems to me that the test set-up must have had a fairly bad ground-loop of some kind as all of the wired results were actually worse than the original jitter. Only the Toslinks seemed better.The Theta TLC evidently has a transformer coupling the S/PDIF output, but like many manufacturers, it is wired as an auto-transformer which eliminates the galvanic isolation. It sounds a lot like the DDDAC which uses a free-running oscillator and an 8412 or 8414. The way this works is that as it "precesses", it throws away samples from the input stream to avoid sync problems. Not bit-perfect, but one way to sync the stream to an asynchronous clock.
These results are actually not so great - 0.5 nsec to 1 nsec of jitter. The risetimes of some of these are 2-3 nsec, so the jitter should not be this high. Probably a result of using inexpensive oscillators, or at least not the best choices IMO.
Steve N.
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Follow Ups
- RE: 'IMO, SPDIF from a computer would be the last method of connectivity to use as far as digital connections. - audioengr 03/19/0823:14:25 03/19/08 (9)
- RE: 'IMO, SPDIF from a computer would be the last method of connectivity to use as far as digital connections. - maabx 06:14:24 03/20/08 (8)
- RE: 'IMO, SPDIF from a computer would be the last method of connectivity to use as far as digital connections. - audioengr 10:53:56 03/20/08 (7)
- Well Steve, looks like the Theta does not drop samples after all... - maabx 16:30:49 03/20/08 (1)
- RE: Well Steve, looks like the Theta does not drop samples after all... - audioengr 22:24:23 03/20/08 (0)
- 'Ultra-low jitter in my book is 10's of picoseconds, not 1nsec' - maabx 11:50:01 03/20/08 (4)
- RE: 'Ultra-low jitter in my book is 10's of picoseconds, not 1nsec' - audioengr 22:29:06 03/20/08 (3)
- RE: 'Ultra-low jitter in my book is 10's of picoseconds, not 1nsec' - maabx 07:14:22 03/21/08 (2)
- RE: 'Ultra-low jitter in my book is 10's of picoseconds, not 1nsec' - audioengr 11:32:09 03/21/08 (1)
- Thanks Steve. -t - maabx 14:42:29 03/21/08 (0)
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