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On Jitter...

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Great link jspar7. I'll post a snippet from the site below.


"On this page you can learn something about jitter, why it exists, how it is generated and what you can do to avoid it.


Although jitter or clock-jitter is a problem in many different technical areas, jitter.de is exclusively dedicated to jitter-related problems concerning audio reproduction and recording.


So if you are into high-end audio or high-quality audio recording or broadcasting, you may find some answers or new perspectives for your application."



- Chris





Founder of Audiophile Style | My Audio Systems AudiophileStyleStickerWhite2.0.png AudiophileStyleStickerWhite7.1.4.png

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  • 3 weeks later...



Jitter in any regard can be dealt with. Remember jitter is correlated to a clocked digital signal. In SPDIF the use of a clock wrapped around the digital data is were part of the problem lies. The other is that the clock is used to stabilize the internal buffer of the transport by speeding up or slowing down the output signal.


There is no real jitter on Firewire and USB because there is no clock associated with the data. There is however "intrinsic jitter" residing in the Firewire/USB controller that get's a bad wrap in audio terms but it can be as it is in SPDIF taken care of or managed easily. Most of this jitter comes because the controller is running at some fixed clock (12MHZ for USB) that has no correlation to audio rates (11.2896MHZ for 44.1K for example). Therefore these controllers use Frequency Synthesizers that create the vital MCLK to move data out of the chip. If you use say Adaptive mode USB you can manage this or even bypass these clocks. In ASYNC mode you can bypass all this and use an External Clock for the development of all the DAC clocks and this results in very low jitter.


But the main point here is that no matter what enviroment you are working with in digital audio you have jitter and in each case there is an answer for reducing it too the lowest possible amount.





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