On adaptive speed design in optical disc servo systems

For CD-ROM or DVD-ROM servo system design, it is desired to maximize the av erage bit rate subject to the constraints imposed by the servo motor, contr ol circuits, decoding electronics, and other limitation factors, The bit tr ansfer, which is governed by the scanning of the disc and the design of the speed profile of the spindle motor, is thus of paramount importance, In th is paper, the speed profile design is formulated as an optimization problem and four different speed profiles are designed to maximize the bit transfe r rate while accounting for different control constraints. All the designs are verified using a CD-ROM experimental setup. The design/analysis results are closely matched with the experimental data.