[SlimDevices: Audiophiles] Transporter: Wordclock in and Processor Loop
This puzzles me: I'm using the Transporter's processor loop. In the loop I have a Behringer SRC2496 sample rate converter and a RME Fireface UC external USB sound card. The Behringer converts incoming data to 44.1kHz. RME is master clock source, and Behringer is happy with that. However, the Transporter jams the Wordclock signal when I select Clock Source: Wordclock In. Alas. Working settings are: Digital Output Encoding: S/PDIF Clock Source: Optical S/PDIF (TOSLINK) Effects loop input: Optical S/PDIF (TOSLINK) Effects loop clock mode: Asynchronous (External processor is master Word Clock On S/PDIF Outputs: Word clock output is disabled (source is master) Changing to Clock Source: Word Clock Input makes the music stop and all the error lights on the Behringer and RME dance. What is happening here? Have I discovered a bug? -- Valentino Valentino's Profile: http://forums.slimdevices.com/member.php?userid=15986 View this thread: http://forums.slimdevices.com/showthread.php?t=74426 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Transporter: Wordclock in and Processor Loop
Can you explain in more detail what you want to accomplish? I don't think word clock has been tested in this context, but it's not clear to me that what you're doing is a valid application for it either. -- seanadams seanadams's Profile: http://forums.slimdevices.com/member.php?userid=3 View this thread: http://forums.slimdevices.com/showthread.php?t=74426 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Transporter: Wordclock in and Processor Loop
seanadams;510024 Wrote: Can you explain in more detail what you want to accomplish? I don't think word clock has been tested in this context, but it's not clear to me that what you're doing is a valid application for it either. Thanks for replying, seanadams. The basis is that I would like to syncronize the receiving end of the effect loop to word clock in instead of the clock embedded in the spdif signal as I do believe that it will reduce jitter in the system. The loop is as follows: Transporter - Behringer SRC2496 (converts all to 44.1) - RME Fireface UC + PC with crossover running at 44.1 - Transporter (- Tweeter amp.) To clarify: My little digital round trip works fine if the Transporter uses SPDIF input as clock source, but Wordclock in seems to OUTPUT something when I select it as clock source. -- Valentino Valentino's Profile: http://forums.slimdevices.com/member.php?userid=15986 View this thread: http://forums.slimdevices.com/showthread.php?t=74426 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Transporter: Wordclock in and Processor Loop
Valentino;510033 Wrote: Thanks for replying, seanadams. The basis is that I would like to syncronize the receiving end of the effect loop to word clock in instead of the clock embedded in the spdif signal as I do believe that it will reduce jitter in the system. It will not. Word clocks should never be used to drive a DAC. It should only go in the _opposite_ direction as the data signal. The loop is as follows: Transporter - Behringer SRC2496 (converts all to 44.1) - RME Fireface UC + PC with crossover running at 44.1 - Transporter (- Tweeter amp.) To clarify: My little digital round trip works fine if the Transporter uses SPDIF input as clock source, I assume the reason for the SRC is that you may be playing 96KHz tracks? If everything were the same rate and there is no asynchronous conversion taking place, then you could run the effects loop in synchrnonous clock mode. This is the absolutely ideal scenario where the clock path never leaves the Transporter - your effects loop is only a data path. but Wordclock in seems to OUTPUT something when I select it as clock source. Data sources take word clock in. DACS produce work clock out. -- seanadams seanadams's Profile: http://forums.slimdevices.com/member.php?userid=3 View this thread: http://forums.slimdevices.com/showthread.php?t=74426 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Transporter: Wordclock in and Processor Loop
Okay. I may be getting it if you can help me with a couple more questions: Even if the BNC is labeled Wordclock In it is actually Wordclock Out? If so: Is the wordclock signal generated from the spdif input Transporter receives from my RME? Thanks again. -- Valentino Valentino's Profile: http://forums.slimdevices.com/member.php?userid=15986 View this thread: http://forums.slimdevices.com/showthread.php?t=74426 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Transporter: Wordclock in and Processor Loop
Valentino;510043 Wrote: Okay. I may be getting it if you can help me with a couple more questions: Even if the BNC is labeled Wordclock In it is actually Wordclock Out? No, it is a word clock in, as labeled. It is used when Transporter is acting as a data source (clock slave) feeding data to an external DAC which has word clock out. Transporter _also_ supports word clock out - in this mode the s/pdif output connectors are repurposed as word clock outputs. That allows Transpoter to act as a DAC for an external data source (eg a CD transport having word clock in). This is not applicable in your case. If so: Is the wordclock signal generated from the spdif input Transporter receives from my RME? Can you rephrase that? Trying to incorporate a word clock into a effects loop context is a weird case because the Transporter is both the data source and the DAC, and yet these functions are decoupled across either side of the effects loop. But I did foresee the value of being able to have the DAC as clock master while in loop mode, and that is exactly what the synchronous clock mode is for. Even if we had supported a word clock in this mode via a dedicated output port, it would still necessarily have the restriction that the loop processor not modify the clock rate. So there was no point - it already does exactly what you want without needing the external connection. There are not a lot of definitive reports as to what digital processors work properly in synchronous loop mode. I know that behringer DEQs do, but Tact DRCs do not (due to ASRC). It would be a good subject for a wiki page. -- seanadams seanadams's Profile: http://forums.slimdevices.com/member.php?userid=3 View this thread: http://forums.slimdevices.com/showthread.php?t=74426 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Transporter: Wordclock in and Processor Loop
Trying to rephrase: Judging by the behaviour of seems to me that Wordclock In OUTPUTS something when I try to use it in my application with the RME as master. Quite unexpected. I will have to read you replies again (and again probably). Very educational, thank you. -- Valentino Valentino's Profile: http://forums.slimdevices.com/member.php?userid=15986 View this thread: http://forums.slimdevices.com/showthread.php?t=74426 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Transporter: Wordclock in and Processor Loop
Valentino;510059 Wrote: Trying to rephrase: Judging by the behaviour of seems to me that Wordclock In OUTPUTS something when I try to use it in my application with the RME as master. Quite unexpected. I still don't know what you mean by that. It is an input and that's all there is to it. -- seanadams seanadams's Profile: http://forums.slimdevices.com/member.php?userid=3 View this thread: http://forums.slimdevices.com/showthread.php?t=74426 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Transporter: Wordclock in and Processor Loop
Okay. So the Transporter just does not like the combo Wordclock in and Asyncronous mode. I still haven't understood why. Shall reread your posts. Thanks again. -- Valentino Valentino's Profile: http://forums.slimdevices.com/member.php?userid=15986 View this thread: http://forums.slimdevices.com/showthread.php?t=74426 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
