| 摘要 |
PURPOSE:To end a reproducing sequency always with one sector unit by forming a circuit outputting a reproducing end signal on the basis of the frame No. and frame No. checking signal of a frame identified at the data reproducing time. CONSTITUTION:An optical disc 5 is constituted of sector marks 7 consisting of sector areas 6, Sm1-SmN for recording information consisting of S1-SN. Each sector is constituted of plural frames F and each frame F is constituted of a frame No. part 4 consisting of a synchronizing signal 1, a data mark 2, a frame serial No. and an error detecting code and a data part 3. A reproducing circuit is provided with a counter 30 for counting up reproducing clock pulses 15 and a frame No. checking circuit 22 for inputting a frame No. signal 23. If no error is detected in a bit string indicating the serial No. by an error detecting code, a frame No. checking signal 24 is loaded to the counter 30. Thus, the reproducing sequency can be ended always in each sector. |
