| 摘要 |
PURPOSE:To execute a stable retrieval at a high speed, by deriving a track number or a distance extending from a present position to an object position, by an operation. CONSTITUTION:A time signal of start of each tune of a disk which is bein played is always recorded in a memory circuit 9. When a retrieval command of a desired tune is executed by a keyboard 10, a position running time converting part 11 outputs an object position running time signal T2 to a musical performance time opeating part 12 by use of the time signal of the circuit 9. An operating time T3 required from a present position to an object position is operated by the operating part 12. A present position distance operating part 13 receives an output of a controller decoder 8, and derives a distance r1 of the present position from the center of the disk. An object position distance operating part 14 inputs an output signal of the operating part 12 and 13, and derives a distance r2 of the object position from the center of the disk. A track number operating part 15 derives a track number extending from the present position to the object position by the distance r1 and r2. Accordingly a designated position can be retrieved by moving a pickup by this track number signal. |
