Patent EP0229925A2 successfully refreshed from Google Patents.
EP0229925A2
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EP
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Recorded data reproducing apparatus
Assignee: Toshiba Corp
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Filing: 1986-11-24
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Granted: —
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Expires: 2006-11-24
Abstract
Abstract A recorded data reproducing apparatus according to the invention includes a memory section (4) having a gain data table (28) for storing gain data determined in accordance with a cylinder position above a recording medium. Using the data representing the current cylinder position, the optimum gain data is determined from the gain data table (28), and supplied to a read pulse generator section (2) under control by a control section (4). With this arrangement, the gain adjusting circuit simplified, and the gain adjustment process is also simplified.
Inventors
- 👤 Katsuhiko Patent Division Kaida
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 20:24
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B5/00; G11B5/012; G11B5/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
119 words
A recorded data reproducing apparatus capable of simplifying a gain adjustment characterized by comprising: read pulse generating means (2) for reading out data from a recording medium, for amplifying a signal corresponding to the read-out data in accordance with input gain data, for differentiating the amplified signal to detect the peak value, and for generating a read pulse on the basis of the detected peak value; memory means (6) for storing a gain data table (28) tabulating the gain data; and control means (4) for referring to said gain data table (28) in accordance with an input read command to determine an optimum gain data, and for outputting the determined gain data to said read pulse generating means (2).
Claim 2
Dependent Claim
119 words
A recorded data reproducing apparatus capable of simplifying a gain adjustment characterized by comprising: read pulse generating means (2) for reading out data from a recording medium, for amplifying a signal corresponding to the read-out data in accordance with input gain data, for differentiating the amplified signal to detect the peak value, and for generating a read pulse on the basis of the detected peak value; memory means (6) for storing a gain data table (28) tabulating the gain data; and control means (4) for referring to said gain data table (28) in accordance with an input read command to determine an optimum gain data, and for outputting the determined gain data to said read pulse generating means (2).
Claim 3
Independent Claim
192 words
The apparatus according to claim l, characterized in that said gain data table (28) stores the gain data dependent on a cylinder position of a head, and said memory means (6) further includes means for storing data indicating the current cylinder position, said control means (4) comprises: determination means (4) for checking whether an input command is either a seek command or a write command, and for determining the input command to be a read command when the input command is neither a seek command nor a write command; cylinder position data output means (4) for outputting the cylinder position data designated by the seek command to said memory means (6) when the input command is determined to be the seek command; cylinder-dependent gain data output means (4) for reading out the cylinder position data stored in said memory means (6), and for referring to said gain data table (28) to generate the cylinder position-dependent gain data in accordance with the cylinder position data read-out, when the input command is the read command; and AGC gain output means (4) for outputting the generated gain data to said read pulse generating means (2).
Claim 4
Dependent Claim
185 words
The apparatus according to claim 2, further comprising temperature detecting means (8) for detecting ambient temperature, and wherein said memory means (6) further includes means for storing the temperature data detected by said temperature detecting means (8), said gain data table (28) further stores the gain data dependent on temperature data, and said control means (4) further includes: means for outputting temperature data detected by said temperature detecting means (8) to said memory means (6); temperature-dependent gain data output means for reading out the temperature data from said memory means (6), and for referring to said gain data table (28) in accordance with the temperature data read-out to generate the temperature-dependent gain data when the input command is determined to be the read command; and means for determining the gain data to be output to AGC gain output means (4), on the basis of the cylinder position-dependent gain data output from said cylinder position-dependent gain data output means (4) and temperature-dependent gain data output from said temperature-dependent gain data output means (4), and for outputting the determined gain data to said AGC gain output means.
Claim 5
Dependent Claim
35 words
The apparatus according to claim 3, characterized in that said control means (4) further comprises means (4) for controlling said temperature detecting means (8) to detect temperature when the input command is the read command.
Claim 6
Dependent Claim
48 words
The apparatus according to claim 3, further comprising timer means (34) for generating an interrupt to said control means (4) after a predetermined time elapses, said control means (4) further comprises means (4) for resetting the measuring time of said timer means (34) after temperature data is detected.
Claim 7
Dependent Claim
34 words
The apparatus according to claim 5, characterized in that said control means (4) further includes means (4) for controlling said temperature detecting means (8) to detect temperature data in accordance with the interrupt input.
Claim 8
Dependent Claim
50 words
The apparatus according to claim 6, characterized in that said control means (4) further includes means (4) for inhibiting said temperature detecting means (8) from detecting temperature when the read command is input after the temperature is detected in accordance with the interrupt and before the next interrupt is generated.
References Cited (Backward Citations)
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