G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.2
G11B 7/00 (2006.01) G11B 7/013 (2006.01) G11B 20/14 (2006.01)
Patent
CA 1103351
Abstract A digital optical record with a data track of data spots and spaces arranged in an improved binary code is described along with a playback apparatus for such record which produces an electrical readout signal of narrow frequency band width. A greater bit storage density is achieved on the record because the minimum length of the data spots and spaces is increased to the width, W, of a single bit data zone, thereby enabling a readout light beam of a larger diameter. In addition, the electrical readout signal has an increased signal-to- noise ratio because the maximum length of the data spots and of the data spaces between spots is reduced to 2W reducing the dynamic range over which the signal must be extracted. The improved code accomplishes these ad- vantages for optical recording by providing data spot to space light transitions in the middle of the bit data zones for "1" bits and by spot to space light transitions at the trailing boundaries of the data zones for "0" bits, except that not light transition occurs at the boundary when the "0" bit is followed by a "1" bit.
293421
Eli S. Jacobs
Smart & Biggar
LandOfFree
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