Optical disc reader for reading multiple levels of pits on an op

Dynamic information storage or retrieval – Binary pulse train information signal – Binary signal gain processing

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369 54, G11B 700

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active

058547797

ABSTRACT:
The present invention is a system for reading a CD having a surface with a multiple level data track including a laser, a focusing and positioning system configured in a way which causes the laser to follow the multiple level data track, a detector which converts the light which is reflected from the data track to an electrical signal, a digital signal processing unit configured to receive the electrical signal including a scaling-function generator for determining a plurality of signal windows from the electrical signal, and a multiple level analog to digital converter which determines a data level based on the signal windows and the electrical signal whereby multiple data levels may be read from the CD.

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Marx, David S. and Psaltis, "Pit Depth Encoded Memories," OSA (Optical Society of America) Optical Data Storage Meeting, May 17, 1994, Dana Point California, published in Porceedings of the SPIE -The International Society for Optical Engineering, 1994, vol. 2338:65-8.
D.S. Marx, D. Psaltis and G. Sirat, "Pit depth encoded memories," OSA (Optical Society of America) Optical Data Storage Meeting, May 17, 1994, Dana Point, California, published in Proceedings of the SPIE -The International Society for Optical Engineering, 1994, vol. 2338:65-8.

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