摘要
To improve the tracking servo performance, a novel signal waveform multi-level （SWML） read-only disc realized on the digital versatile disc （DVD） platform is presented. The characteristic of the differential phase detection （DPD） signal of the SWML read-only disc is analyzed both in theory and experiment. The amplitude of the DPD signal of the SWML read-only disc in an open tracking servo loop is about 2/3 of that of the DVD read-only disc. The uniformity and symmetry of the DPD signal of the SWML read-only disc are similar to those of the DVD read-only disc and better than the former multi-level run-length limited （ML-RLL） read-onlv disc.
To improve the tracking servo performance, a novel signal waveform multi-level （SWML） read-only disc realized on the digital versatile disc （DVD） platform is presented. The characteristic of the differential phase detection （DPD） signal of the SWML read-only disc is analyzed both in theory and experiment. The amplitude of the DPD signal of the SWML read-only disc in an open tracking servo loop is about 2/3 of that of the DVD read-only disc. The uniformity and symmetry of the DPD signal of the SWML read-only disc are similar to those of the DVD read-only disc and better than the former multi-level run-length limited （ML-RLL） read-onlv disc.
基金
supported by the National Natural Science Foundation of China under Grant No.0677036
