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In Reply to: RE: Are you serious? posted by rlw on September 08, 2015 at 13:44:36
It could be hogwash, but it could also relate to how the firmware works. Without detailed design information (reverse engineering) of the firmware, I would not dismiss the possibility. Unlikely, but not impossible.
For doing comparison testing my normal practice is to assume the worst and eliminate these possibilities by using consistent button pushes. IMO, as unlikely as it may be, failure to control every variable that can be practically controlled is failure to practice careful experimentation. So, for example, when people who dismiss results of others as "hogwash" I tend to be suspicious of these people's own experimental results. My working assumption is that people who have a closed mind are not going to be good experimenters.
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
Follow Ups:
Jerome is quite serious about this. He and I both have the ELP laser turntable and it was on discussing that device that he espoused his theorem. I have pressed him for an explanation on his theory, but he hasn't been forthcoming.
In short, he believes that "all servo mechanisms have a memory". What he means by this is that the disc you play influences the subsequent disc output unless you reset the device.
In the link, I ask him for clarification on what he means exactly since he appears to be using Control Systems terms in a slightly different sense to what I am familiar with.
It is true that certain Sony SACD players can be recalibrated for laser power (I can't remember the reference) and this is used presumably to compensate for laser ageing. However, from what I understand, he is referring to the output data being modified by the previous disc data like an overlay mask.
The magnitude of the output signal will depend on the laser power and the reflection coefficient from the disc surface, but this has nothing to do with the recovered data and only affects the reliability of data recovery with respect to the error correction algorithm. The wavelength of a laser is highly dependent on temperature and if any difference is observed using his method then it would be in resetting the temperature compensation or power output control. However, this can only affect the reliability of the data recovery. Therefore any differences must be due to data related errors and induced jitter.
When applied to the ELP, it is absolute nonsense!
Regards Anthony
"Beauty is Truth, Truth Beauty.." Keats
I recall some nutter claiming that playing a Telearc, or other digitally mastered LP, on a turntable would destroy the turntable. This was hogwash and I demonstrated such by doing some measurements before/after.
Ironically, within a few months, the sapphire bearing on my SOTA turntable had failed. "Those whom the gods wish to destroy they first make mad."
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
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