Method and apparatus for reproducing information recorded on CLV disc type record medium

摘要

A record medium of disc type is recorded by a constant linear velocity. The record medium is reproduced by a reproducing apparatus, which reads the information from the rotated record medium into a buffer memory by a transmission rate corresponding to the number of rotation of the record medium and outputs the read information from the buffer memory to an external apparatus by a predetermined output rate. The method of reproducing the record medium by the reproducing apparatus is provided with the steps of: setting radial ranges of a plurality of virtual zones on the record medium, each of which is in a ring shape, and the number of rotation for each of the virtual zones, on the basis of upper and lower limit values of the transmission rate, which are predetermined to be higher than the predetermined output rate, a radius of the most inner circumference of an area where the information is recorded on the record medium, and a memory capacity of the buffer memory; rotating the record medium by a constant angular velocity in each of the set virtual zones by the set number of rotation; and reading the information from the rotated record medium by the transmission rate corresponding to the set number of rotation in each of the set virtual zones.