Information reading apparatus

Abstract

An information reading apparatus has a feature that, when a disc on which data is recorded by a CLV system is read out by a CAV system, a transfer rate is changed in accordance with an amount of data recorded on the disc and the data can be efficiently read out in a short time. In an information reading apparatus arranged such that data read by rotating at a constant angular velocity a disk-shaped recording medium on which data is recorded at a constant linear velocity is transmitted to an external apparatus through a buffer memory, there is provided a setting unit for setting a rotational angular velocity of the disk-shaped recording medium in a manner such that a transfer rate when the information read at a predetermined radial position excluding the outermost peripheral portion in the information recording region of the disk-shaped recording medium is transferred to the buffer memory is equal to the maximum sustain transfer rate at which the information reading apparatus can perform the reading operation.

Description

[0001] This application is a divisional application of the Chinese patent application with application number 96119803.6 and application date of September 9, 1996. technical field [0002] The present invention relates to an information reading device for a so-called CLV (Constant Linear Velocity) disc that records information at a constant linear velocity. Background technique [0003] Currently, CD-ROMs that use so-called CDs (Compact Disks) for reproducing music as ROMs (Read Only Memory) of computers and the like are widespread because of their large memory capacity. [0004] A CD-ROM is a storage medium in which digital data, programs, etc. are recorded instead of music signals in a data recording area provided in a predetermined portion of a CD. In a CD-ROM, grooves carrying data are arranged spirally from a predetermined inner circumference portion of the disc toward the outer circumference, and a guide area is formed from the innermost circumference portion to a pred...

AI Technical Summary

Problems solved by technology

[0013] However, when data is read from the inner circumference of the information recording area of ​​the disc, since the data is read at a transmission speed far lower than the maximum processing capacity of the player, the transmission speed of the data in the inner circumference is reduced. such problem

Therefore, there is a disadvantage that the minimum guaranteed value of the data transmission speed, that is, the transmission speed at which the device can continuously transmit data, cannot be increased in the innermost circumferential part of the information recording area of ​​the disc.

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