Dynamic magnetic information storage or retrieval – General processing of a digital signal – Head amplifier circuit
Patent
1987-07-21
1988-12-27
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Head amplifier circuit
360 65, G11B 509, G11B 1514
Patent
active
047944692
ABSTRACT:
A recorded data reproducing apparatus according to this invention comprises a data pulse generation section, a peak detection section and a control section. The data pulse generation section 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 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 detects the peak value of the amplified signal. The control section 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 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 of the data pulse generation section.
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IBM Technical Disclosure Bulletin, vol. 23, No. 2, Jul. 1980; pp. 738.742, N.Y., U.S.; R. C. Jahnke: "Track-Locating and-Following Apparatus for Flecible Disk File" *Whole Article*.
Asai Kenji
Kaida Katsuhiko
Canney Vincent P.
Kabushiki Kaisha Toshiba
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