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Music servers and other computer based digital audio technologies.

RE: Sound Quality Changes caused by Sata cables.

"The goal is to spread out the energy of energetic peaks to a wider band which will allow the manufacturers to utilize a loophole in the test method to attain compliance."

The test method was not a "loophole". It was good engineering to address a specific technical problem that was a result of interference actually observed. My knowledge is based on conversations with engineers for a large computer company where I worked that were specifically concerned with achieving conformance and which, of necessity, had a thorough understanding of the issues involved. The requirements were designed to protect the interest of competing radio services that used narrow band modulation. The advantage of spreading the interference over a wide band of frequencies is that it minimizes the probability of interference in any actual situation, where there are a small number of frequency bands that are active and most others are inactive. However, the active frequencies are specific to the particular installation, e.g. the local TV channels and the ones the neighbor actually wants to watch at the time the offending computer is powered up. Spreading the bandwidth of noise is not likely to affect systems such as pacemakers which are not narrow band radio receivers.

I've seen interference between computerized avionics where the noise from the computer killed certain of the VHF comm channels. The fix was to change the software to move the noise to different channels that were unlikely to be used. (This was done by the manufacturer of the offending avionics who happened to be a personal friend and I have personally experience the "before" and "after" effect on my radio reception.)




Tony Lauck

"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar


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