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external clock on DDRC-24 5 years 1 month ago #27068

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Can DDRC-24 use an external clock ?

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external clock on DDRC-24 5 years 1 month ago #27185

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@ sanji99

On the USB it would. Note however that it will be reclocked when it arrives by the ASRC (required as DSP can't follow an external clock).
So I don't think that use of a word clock really applies to the needs of a 2x4HD.

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external clock on DDRC-24 5 years 4 weeks ago #27259

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@devteam

Indeed, a very important question is whether, in the case reclocking, increased sampling jitter, or in this case, jitter occurs behind ASRC ?

+I would ask your explanation of jitter in reclocking audio systems.
+What is the order of magnitude sampling jitter in DDRC-24 ?
+Would you be able to reduce jitter with some DIY methods ?

Thank you for your answers.

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external clock on DDRC-24 5 years 3 weeks ago #27377

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@ sanji99,

If you're so concerned about Jitter, we're assuming that you're understanding why you've got to worry about it. :-)
- We're not going to start a complete course on this (lots of online info if you google), we can only give some hints maybe worth reading.. One is about the purpose of an ASRC. Why do we use it? well because our DSP only run at one rate. You can see that an ASRC is a device used to "reclock" an input stream to another sample rate. So a jittery signal (E.g. from SPDIF) can easily be "reclocked" to a more stable clock (i.e. the one from the DSP). The most useful thread on this topic can be found here.
www.diyaudio.com/forums/digital-source/2...rate-conversion.html
- Jitter will be measured Digital in/Digital out. In this case, you're doing Digital IN, analog out. Correct?

Food for thought on some further reading...
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