公开(公告)号：EP0255036A3

公开(公告)日：1988-10-19

申请号：EP87110625

申请日：1987-07-22

申请人： KABUSHIKI KAISHA TOSHIBA ,  Toshiba Computer Engineering Corporation

发明人： Kaida, Katsuhiko c/o Patent Division ,  Asai, Kenji

IPC分类号： G11B20/10 ,  G11B05/012 ,  G11B05/596

CPC分类号： G11B20/10027 ,  G11B20/10 ,  G11B20/10009

摘要： A recorded data reproducing apparatus according to this invention comprises a data pulse generation section (l0 to l5), a peak detection section (l7 to l9) and a control section (20 to 22). The data pulse generation section (l0 to l5) reads out data written on the cylinder of a recording medium on which a magnetic head is currently positioned. According to received gain data, the data pulse generation section (l0 to l5) amplifies a signal corresponding to the readout data, and selectively generates data pulse sequence based on the amplified signal. When the amplified signal corresponds to servo data, the peak detection section (l7 to l9) detects the peak value of the amplified signal. The control section (20 to 22) determines whether or not the magnitude of the detected peak value is nearly equal to a predetermined value. If the determination is nega­tive, the control section (20 to 22) refers to a gain data table to determine a change amount of the gain data, and supplies the gain data updated based on the change amount to the data pulse generation section (l0 to l5).