| 摘要 |
PURPOSE: To judge which disk a new disk replaces when the new disk is put on the market by counting the numbers of requests of disks which are made from the installation time and the number of requests of the disks from disk replacement time, disk by disk, and displaying the both. CONSTITUTION: A decoder 5 discriminates which music of a disk is selected and supplies information on that to a statistics unit 12. The statistics unit 12 processes the supplied signal statistically and calculates and displays the statistics of selected music by selected disks at a display part. Namely, a 1st counter counts the number of requests which are made from the installation time by the disks and a 2nd counter counts the number of requests of the disks which are made from their disk replacement time by the disks, so that both their counted values are displayed. |
