Bugzilla – Bug 4634
Not slave 96kS/s external word clock
Last modified: 2008-08-04 14:02:57 UTC
I use Transporter, TacT Millennium MK3 Digital amp and Antelope Isochrone OCX master clock. Transporter and PC are connected by wireless network. problem is, Slimserver version used : 6.5.0-2006-09-19 Transporter firmware is 18, this version is Slimserver 6.5.0 included. 1. First setup (44.1kHz External Word clock) - selected 'Clock Source' as 'Word Clock input' - connected Transporter word clock input to a 44.1kS/s word clock from Antelope Isochrone OCX - connected Transporter AES/EBU output to Tact Millennium MK3 input - powerd up Transporter (unplug and plug power cord) - Slimserver play 44.1kHz/16bit WAV file Works OK. Transporter slave to the external word clock. 2. Second setup (96kHz Internal Word clock) - selected 'Clock Source' as 'Internal' - connected Transporter AES/EBU output to Tact Millennium MK3 input - powered up Transporter (unplug and plug power cord) - Slimserver play 96kHz/24bit WAV file Works OK. 3. Third setup (96kHz External Word clock) - selected 'Clock Source' as 'Word Clock input' - connected Transporter word clock input to a 96kS/s word clock from Antelope Isochrone OCX - connected Transporter AES/EBU output to Tact Millennium MK3 input - powerd up Transporter (unplug and plug power cord) - Slimserver play 96kHz/24bit WAV file Not Works. There is no usable signal on the AES/EBU output, SPDI/F and TOS too. As for transporter, it seems not to be able to do play 96kHz/24bit file that synchronizes with 96kS/s External word clock. I think that the cause of this problem is in the Transporter's firmware program. Hiroshi
Sean can you look at this?
(In reply to comment #0) > I use Transporter, TacT Millennium MK3 Digital amp and Antelope Isochrone OCX > master clock. > Transporter and PC are connected by wireless network. > > problem is, > > Slimserver version used : 6.5.0-2006-09-19 > Transporter firmware is 18, this version is Slimserver 6.5.0 included. > > 1. First setup (44.1kHz External Word clock) > - selected 'Clock Source' as 'Word Clock input' > - connected Transporter word clock input to a 44.1kS/s word clock from > Antelope Isochrone OCX > - connected Transporter AES/EBU output to Tact Millennium MK3 input > - powerd up Transporter (unplug and plug power cord) > - Slimserver play 44.1kHz/16bit WAV file > > Works OK. > Transporter slave to the external word clock. > > > 2. Second setup (96kHz Internal Word clock) > - selected 'Clock Source' as 'Internal' > - connected Transporter AES/EBU output to Tact Millennium MK3 input > - powered up Transporter (unplug and plug power cord) > - Slimserver play 96kHz/24bit WAV file > > Works OK. > > > 3. Third setup (96kHz External Word clock) > - selected 'Clock Source' as 'Word Clock input' > - connected Transporter word clock input to a 96kS/s word clock from Antelope > Isochrone OCX > - connected Transporter AES/EBU output to Tact Millennium MK3 input > - powerd up Transporter (unplug and plug power cord) > - Slimserver play 96kHz/24bit WAV file > > Not Works. > There is no usable signal on the AES/EBU output, SPDI/F and TOS too. > As for transporter, it seems not to be able to do play 96kHz/24bit file > that synchronizes with 96kS/s External word clock. > > I think that the cause of this problem is in the Transporter's firmware > program. > > Hiroshi > This is hard to diagnose without having all the equipment at hand, but a 96KHz word clock should work fine. However, I think you are confused about the purpose of using an external clock. The word clock absolutely MUST come _from_ the DAC in order for it to have any sonic benefit. A word clock should never be used as a master clock source, except for special circumstances such as all-digital editing, or where DAC performance is not important.
Hiroshi: Is this issue resolved for you?
Confirmed this is NOT an electrical issue. Word clock has no problem syncing at 100+ KHz. Possibly an intermittent glitch related to this bug: https://bugs-archive.lyrion.org/show_bug.cgi?id=4834 Still investigating...
Fixed in trunk 17060 / firmware 40. Word clock synching is reliable at all sample rates up to 100KHz.
Changing fixed target to 7.1 as FW 40 will be released then, not in 7.0.1
This bug has now been fixed in the 7.1 release version of SqueezeCenter! Please download the new version from http://www.slimdevices.com if you haven't already. If you are still experiencing this problem, feel free to reopen the bug with your new comments and we'll have another look.