Patent US4379098A successfully refreshed from Google Patents.
EP0255036A2
Expired / Lapsed
EP
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Recorded data reproducing apparatus
Assignee: Toshiba Corp
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Filing: 1987-07-22
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Granted: —
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Expires: 2007-07-22
Abstract
Abstract 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).
Inventors
- 👤 Katsuhiko C/O Patent Division Kaida
- 👤 Kenji Asai
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 12:54
CPC Classifications
G; G11; G11B; G11B21/00; G11B21/02; G11B21/08; G11B20/00; G11B20/10; G11B20/10009; G11B20/10018; G11B20/10027; G11B21/10
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
182 words
A recorded data reproducing apparatus having a simple configuration and being capable of obtaining data pulse sequence with a desired accuracy and at high speed, said recorded data reproducing apparatus comprising data pulse generator means (l0 to l5) for sequentially reading out data written on a cylinder of a recording medium on which a head is currently positioned, for amplifying a signal corresponding to the readout data in accordance with gain data supplied thereto, and for selectively generating the data pulse sequence based on the amplified signal; and peak detection means (l7 to l9) for selectively detecting peak values of the amplified signal, characterized by further comprising: control means (20 to 22) for supplying the gain data currently designated to said data pulse generator means, for referring to a gain data table based on a sum of the peak values detected by said peak detection means to determine a change amount of the gain data, for combining the gain data and the change amount to update the gain data, and for outputting the gain data combined to said data pulse generator means.
Claim 2
Dependent Claim
182 words
A recorded data reproducing apparatus having a simple configuration and being capable of obtaining data pulse sequence with a desired accuracy and at high speed, said recorded data reproducing apparatus comprising data pulse generator means (l0 to l5) for sequentially reading out data written on a cylinder of a recording medium on which a head is currently positioned, for amplifying a signal corresponding to the readout data in accordance with gain data supplied thereto, and for selectively generating the data pulse sequence based on the amplified signal; and peak detection means (l7 to l9) for selectively detecting peak values of the amplified signal, characterized by further comprising: control means (20 to 22) for supplying the gain data currently designated to said data pulse generator means, for referring to a gain data table based on a sum of the peak values detected by said peak detection means to determine a change amount of the gain data, for combining the gain data and the change amount to update the gain data, and for outputting the gain data combined to said data pulse generator means.
Claim 3
Independent Claim
50 words
The apparatus according to claim l, characterized in that said data pulse generator means (l0 to l5) generates the data pulse sequence when the readout data corresponds to recorded data, and said peak detection means (l7 to l9) detects the peak values when the readout data corresponds to servo data.
Claim 4
Dependent Claim
28 words
The apparatus according to claim 2, characterized in that the servo data has two patterns that are arranged so as to be alternately read out by said head.
Claim 5
Independent Claim
72 words
The apparatus according to claim l, characterized in that said control means (20 to 22) includes: the gain data table (2l) for storing the change amount of the gain data with respect to the sum of the peak values detected by said peak detection means; and means (20) for updating the gain data until the sum of the peak values falls within a predetermined error range with respect to a predetermined value.
Claim 6
Dependent Claim
52 words
The apparatus according to claim 4, characterized in that said control means (20 to 22) further includes means (20) for holding the gain data currently designated, until the change amount of the gain data is input, when a cylinder position of said head is changed in accordance with an input seek command.
Claim 7
Dependent Claim
74 words
The apparatus according to claim 4, characterized in that said control means (20 to 22) further includes: a cylinder-dependent gain data table (2l) for storing gain data with respect to a cylinder position; and determination means (20) for, upon inputting of a seek command, referring to said cylinder-dependent gain data table on the basis of the cylinder position specified by the seek command so as to determine gain data for the specified cylinder position.
Claim 8
Dependent Claim
93 words
The apparatus according to claim 4, characterized in that said apparatus further comprises drive means (24) for adjusting a head position in accordance with difference data input thereto so as to center said head on the cylinder; and wherein said control means (20 to 22) further includes means (20, 23) for calculating the difference data corresponding to a difference between the peak values when the sum of the peak values falls within the predetermined error range with respect to the predetermined value, and for outputting the difference data to said drive means (24).
Claim 9
Dependent Claim
17 words
The apparatus according to claim 3, characterized in that the servo data is written on respective disks.
Claim 10
Dependent Claim
18 words
The apparatus according to claim 3, characterized in that the servo data is written on a specific disk.
References Cited (Backward Citations)
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