For a high density ROM type optical disc, SCIPER/RPR method has been proposed. This is the combination of a single carrier independent pit edge recording(SCIPER)method and a radial direction partial response(RPR)reproduction method. For this system, we have developed signal processing techniques; pit alternating allocation, convolutional code, write pre-compensation, an adaptive equalizer, a carrier canceler, and Viterbi decoding. We evaluated the data reproduction performance of the system by computer simulation. As a result, we confirmed that a noise margin was improved by 5.4dB at a bit error rate of 1×10^<-3> and margins against tangential tilt, timing offset, and pit position offset were increased.
View full abstract