Optical disk device
AssigneeTEAC Corporation
InventorsJunichi Kanenaga, Hiroyuki Onda
Life of this patent
Estimating the term…
Abstract
An optical disk device has a unit for counting data read errors from an optical disk and a unit for reducing a playback speed of an optical disk. When a number of data read errors occurring in a predetermined period of time exceeds a predetermined value the playback speed reducing unit reduces the playback speed of the optical disk. As a result, repetition of error detection and consequent reduction in playback speed with each data read command when reading defective sectors of an optical disk can be prevented and the time required for error detection and speed reduction thereby eliminated, greatly improving overall average playback speed.
Claims6
An optical disk device for reading and playing back data from an optical disk by using a light pickup, a playback being performed at a maximum playback speed and then the playback speed being gradually reduced based on data read errors until a playback is performed without errors, the playback speed then being returned after reading the data, the optical disk device comprising:
- means for counting a number of data read errors;
- and
- means for resetting the maximum playback speed of the optical disk to a limited maximum playback speed correlated to that at which a data read error does not occur when a number of errors counted by the counting means during a predetermined time period exceeds a predetermined value.
An optical disk device for reading and playing back data from an optical disk by using a light pickup, a playback being performed at a maximum playback speed and then the playback speed being gradually reduced based on data read errors until a playback is performed without errors, the playback speed then being returned after reading the data, the optical disk device comprising:
- means for determining a time interval between data read errors;
- and
- means for reducing a playback speed of the optical disk when the time interval between read errors is within a predetermined time period such that the playback speed is reduced to a new maximum playback speed correlated to that at which a data read error does not occur.
Dependencies are inferred from the claim text.