Method and apparatus for generating descrambling data for CD-ROM

Details Method and apparatus for generating descrambling data for CD-ROM Method and apparatus for generating descrambling data for CD-ROM

1997-05-06

1999-11-16

Baker, Stephen M.

Excavating

341 50, 369 59, 380 50, H03M 700, G11B 2014

Patent

active

059845210

ABSTRACT:
Descrambled data is generated for a CD-ROM decoder and a descrambler. A lower first through fifteenth bits of the descrambled data are generated according to an equation DSCR.sub.0 [x]=DSCR.sub.-1 [x+2].sym.DSCR.sub.-1 [x+4], where 1.ltoreq.i.ltoreq.15. The upper sixteenth through thirty-second bits of the descrambled data are generated according to the equation DSCR.sub.0 [x]=DSCR.sub.0 [x-15].sym.DSCR.sub.0 [x-14], where 16.ltoreq.i.ltoreq.32. DSCR.sub.0 [x] is an x-th bit of current 32-bit descrambled data, DSCR.sub.-1 [x] is an x-th bit of preceding 32-bit descrambled data and a symbol .sym. refers to an EX-OR operation.

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