Hybrid equalized partial response path-feedback maximum likelihood toward higher density Blu-ray disc

We have developed HEPR-PFML (hybrid equalized partial response path-feedback maximum likelihood) as a signal processing technology for a high density optical recording system like Blu-ray disc. This technology is not only able to decode with maximum likelihood as reproducing the higher frequency component over the cutoff of MTF (modulation transfer function), but is also able to improve timing recovery. We implemented this system on the programmable device as a read channel and made it possible to process maximum likelihood for the Blu-ray disc with stable and good performance.