What method was used to measure/evaluate scattered invisible light inside a working (CD is rotating) CD player before and after application of whatever is being talked about here?
Machina Dynamica New Dark Matter CD and Blu Ray tray treatment?
This is a set of adhesive-backed thin plastic pieces that one attaches to one’s transport or player disc tray. The disk rests on them during non-spin mode, but presumably don’t touch the applied thin pieces during playback mode. The company says the new Dark Matter pieces reduces background scattered light from reaching the photodetector, thereby improving performance.
Anyone tried this product? Please specify transport or player if you have and your impressions.
Anyone tried this product? Please specify transport or player if you have and your impressions.
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- 466 posts total
rpeluso535 posts04-04-2019 2:36pmIts the reflected stray light that these bit are designed/claimed to absorb. >>>While that’s a true statement as to what NDM is designed/claimed to do it doesn’t answer the question regarding why the color black won’t work just as well. |
Well, given my limited background about how CD players work (as I am sure Geoff can attest given my questions to him via PM), I’ll take a stab at this answer. The laser has a different wavelength range than the photodetector, wherein the photodetector can detect both visible and invisible light. As a result, the invisible light (UV and IR) is picked up by the photodetector, thereby obscuring the data stream attributed to the visible light. Presumably, this additional light info might not be corrected by the Reed-Solomon error detection/correction codes. The NDM squares can absorb the invisible light, removing it from being detected by the photodetector. This improves the fidelity of the photodetector in capturing a better ratio of disc-related reflected light to unrelated reflected light, thereby enhancing the photodetector’s resultant signal to noise ratio. |
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