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Rockbox mail archiveSubject: Re: Cheap/good digital-audio Boston Acoustics BA735Re: Cheap/good digital-audio Boston Acoustics BA735
From: David McIntyre <plugh_at_mudbarn.com>
Date: Fri, 5 Sep 2003 15:56:03 -0700 The MAS data sheets have an errata that covers unstable S/PDIF clock signals. They recommend using parity and checking after every frame. Talk about a pain in the butt! I wonder if that's handled in the Archos code. On Fri, Sep 05, 2003 at 05:28:06PM -0500, LoveLearn wrote: > Sharing research results: > > 1984 standard S/PDIF is unbalanced .5 volt originally designed for > lengths up to 1 meter. > For long feeds, lots of vendors sell S/PDIF converters to produce 1985 > AES/EBU (Audio Engineering Society/European Broadcast Union), a balanced > 5 volt similar standard reportedly useful to 100 or 200 meters, > depending on which description you read. > > >From http://www.soundonsound.com/sos/Jun03/articles/qa0603.asp > "You can run S/PDIF up to a metre or two without any problems at all, > almost regardless of the type of cable, and if you use decent 75(omega) > coaxial cable (proper 'digital' cable or standard video coax) you can > run an S/PDIF signal several metres. > However, if you are intending to run an S/PDIF signal to a D-A converter > I would say keep the cable as short as you possibly can, because > cable-induced jitter will affect the decoder's clock in a detrimental > way. The D-A relies directly on the embedded clock signal and cable > jitter will mess this up. The longer the cable, the more capacitive it > is and the greater the jitter will become. Very few budget D-A > converters have decent jitter-rejection properties able to cope with the > effects of long cables. Jitter can be heard as a vagueness in the stereo > imaging and very flat, two dimensional sound stages on well-recorded > acoustic material." > > Satisfied S/PDIF cable user reports seem to stop at about 12 feet. So > much for the cheap long runs pipe dream. I still don't know if a single > S/PDIF output can simultaneously drive two inputs using a simple in-line > splitter. > > Here's an instructive S/PDIF site: > Andrew's S/PDIF Stuff > http://www.andrewkilpatrick.org/mind/spdif/ -- David McIntyre plugh_at_mudbarn.com http://www.mudbarn.com PGP Key fingerprint = CAB5 A73A 43FA 19E3 449D 20B8 25D7 FA84 8847 D6A7 http://www.mudbarn.com/~plugh/plughinfo.txt for geek code, pgp key, etc.Received on 2003-09-06 Page template was last modified "Tue Sep 7 00:00:02 2021" The Rockbox Crew -- Privacy Policy |