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Re: RE Error Rates and Jitter

Either you did not bother to read the basic URL referred to, or you did, and did not understand it.

I have to ask:
How many CD player power supplies have you checked?

How many DAC's PS have you checked?

All the mid-fi (and some entry level high end) players/DACs I have checked had significant PS transients.

Unless herculean efforts are taken (PS alone costing more than entire mid-fi CD player), there will be PS garbage at the DAC and clock.

The jitter or ANYTHING ELSE that occurs within a transport will affect the transmitted digital data. Sending it to an external DAC (which will NOT have a master clock in 99% of the cases), will cause the jittered data to be received within the DAC, AND THE JITTERED DATA, WILL FIRE THE RECEIVER CIRCUITRY IN THE JITTERED PATTERN INSTEAD OF A CLEAN PATTERN.

Anything but a perfect set of PS's in an ultra high end DAC will have SOME PS transients related to the receiver firing pattern, and these can get into the DAC chip.

So isolation of the laser read, and the decode from 8-to-14 FM modulation to the SPDIF format, does not prevent the disc related artifacts from getting into an external DAC, as the jittered data will feed into the DAC via the receiver firing pattern PS transients.

Once one understands that the PS in a huge player in this situation, and that NO PS can avoid transient anomalies, then it becomes clear that many things can end up affecting the real-tinme playback of the digital data into analog signals.

See:
http://www.rogernichols.com/EQ/EQ_2000_02.html

Jon Risch

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