METHOD FOR CODING MULTILAYER INFORMATION BY INTERLEAVING IN WORD BUILDING AND ERROR PROTECTION WITH AID OF LOCATION DETECTING KEYS OBTAINED FROM RELIABLY PROTECTED WORDS AND POINTING TO THOSE INSUFFICIENTLY PROTECTED; METHOD FOR DECODING SUCH INFORMATION AND MEDIUM PROVIDED WITH SUCH INFORMATION Russian patent published in 2004 - IPC

FIELD: coding means incorporating data protection provision. SUBSTANCE: multiword information is coded using multibit characters; interleaving is executed during word building; coding is ensured by error location detecting keys for multiword groups; keys are generated in reliably protected keywords and function to point to unreliably protected target words. Keywords may have equal first size and may be distributed using first uniform method. Target words may have second equal size and may be distributed using second uniform method. Proposed method is used in optical memory devices. EFFECT: enhanced precision and reliability of decoding. 21 cl, 10 dwg