EP0546818A1
Expired / Lapsed
EP
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Information recording and reproduction apparatus
Assignee: Sharp Corp
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Filing: 1992-12-09
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Granted: —
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Expires: 2012-12-09
Abstract
Abstract An information recording and reproduction apparatus has a recording-use memory and a reproduction-use memory. The reading speeds of the respective memories are set so as to be equal to the reading speed derived from the carrier central frequency of the absolute address which is prerecorded on a disk based on the constant linear velocity control method. With the arrangement, the simultaneous recording and reproduction of information with respect to different portions on the disk is carried out at a high speed without changing the rotation speed of the disk.
Inventors
- 👤 Shigeo Terashima
- 👤 Shigemi Maeda
- 👤 Kunio Kojima
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 22:40
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/12; G11B7/14; G11B19/00; G11B19/20; G11B19/24; G11B19/247; G11B11/00; G11B11/10; G11B11/105; G11B11/10595; G11B19/02; G11B20/00; G11B20/10; G11B20/10527; G11B27/00; G11B27/005; G11B27/02; G11B27/031; G11B27/034; G11B27/10; G11B27/19; G11B27/28; G11B27/32; G11B27/327; G11B27/329; G11B7/004; G11B2220/00; G11B2220/20; G11B2220/25; G11B2220/2525; G11B2220/2537; G11B2220/2545
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
206 words
An information recording and reproduction apparatus for carrying out recording and reproducing of information simultaneously with respect to a disk-shaped recording medium wherein position information for recording and reproduction operations is pre-recorded over the whole surface thereof based on the CLV control, comprising: position information detection means for detecting the position information for recording and reproduction operations; recording-use memory means for temporarily storing information to be recorded on said recording medium; reproduction-use memory means for temporarily storing reproduced information from said recording medium; rotation speed control means for rotating said recording medium at a first rotation speed during recording and reproducing of information with respect to a first radial position on said recording medium, and for rotating said recording medium such that a rotation speed during recording and reproduction of information with respect to a second radial position on said recording medium coincides with said first rotation speed; and compensation means for compensating reading speeds of said respective recording-use memory means and reproduction-use memory means according to the detected position information for recording and reproduction during recording and reproducing of information with respect to said second radial position such that the recording and reproduction of information is equivalent to that based on the constant linear velocity.
Claim 2
Dependent Claim
75 words
The information recording and reproduction apparatus as set forth in claim 1, wherein said position information detection means is a pre-recorded information detection circuit means for detecting pre-recorded information which is defined such that a groove on said recording medium is slightly wound according to a predetermined frequency signal with respect to a radial direction of said recording medium, said pre-recorded information detection circuit means including a band-pass filter means and a phase locked loop.
Claim 3
Dependent Claim
26 words
The information recording and reproduction apparatus as set forth in claim 2, wherein said predetermined frequency signal corresponds to biphase-mark modulated data of an absolute address.
Claim 4
Dependent Claim
37 words
The information recording and reproduction apparatus as set forth in claim 1 is used in an apparatus wherein magneto-optical recording based on magnetic field modulation method and overwriting are carried out with respect to said recording medium.
Claim 5
Dependent Claim
47 words
The information recording and reproduction apparatus as set forth in claim 1, wherein said recording-use memory means is a buffer memory and said reproduction-use memory means is a buffer memory, said memories being arranged such that information can be written therein and can be read out thereof.
Claim 6
Dependent Claim
59 words
The information recording and reproduction apparatus as set forth in claim 2, wherein said rotation speed control means includes: a spindle motor means for rotating said recording medium; and a constant linear velocity control circuit means for controlling a rotation speed of said spindle motor means in response to said pre-recorded information detection circuit means and said compensation means.
Claim 7
Dependent Claim
19 words
The information recording and reproduction apparatus as set forth in claim 1, wherein said compensation means is a controller.
Claim 8
Dependent Claim
152 words
The information recording and reproduction apparatus as set forth in claim 1, wherein said compensation means compensates reading speed V R such that recording of information with respect to said second radial position is carried out upon completion of reproduction of information from said first radial position by satisfying an equation of V R = V W × (N₂/N₁), where N₁ indicates a rotation speed of said recording medium during reproduction of said first radial position, N₂ indicates a rotation speed, which is derived from a rotation speed of said second radial position, during reproduction of said second radial position based on the CLV control, V W indicates a writing speed at which information to be recorded on said second radial position is temporarily stored in said recording-use memory means, and said V R indicates the reading speed at which the temporarily stored information is read out of said recording-use memory means.
Claim 9
Dependent Claim
166 words
The information recording and reproduction apparatus as set forth in claim 1, wherein said compensation means compensates reading speed V₂ such that reproduction of information from said second radial position is carried out upon completion of reproduction of information from said first radial position by satisfying an equation of V₂ = V₀ × (N₂/N₁), where N₁ indicates a rotation speed of said recording medium during reproduction of said first radial position, N₂ indicates a rotation speed, which is derived from a rotation speed of said second radial position, during reproduction of said second radial position based on the CLV control, V₀ indicates a constant speed at which information, which is temporarily stored in reproduction-use memory means, is read out of said reproduction-use memory means when said recording medium rotates based on the CLV control, and said V₂ indicates the reading speed at which information temporarily stored in said reproduction-use memory means is read out of said recording-use memory means during reproduction of said second radial position.
Claim 10
Dependent Claim
177 words
An information recording and reproduction apparatus for carrying out recording and reproducing of information simultaneously with respect to a disk-shaped recording medium wherein position information for recording and reproduction operations is pre-recorded over the whole surface thereof based on the CLV control, comprising: pre-recorded information detection circuit means for detecting the position information for recording and reproduction operations one by one; rotation speed control means for rotating said recording medium at a first rotation speed during recording and reproducing of information with respect to a first radial position on said recording medium, and for rotating said recording medium such that a rotation speed during recording and reproduction of information with respect to a second radial position on said recording medium coincides with the first rotation speed; and first and second buffer memories means for compensating data transmission speed according to the detected position information for recording and reproduction during recording and reproducing of information with respect to said second radial position such that the data transmission speed always coincides with that based on the CLV control method.
Claim 11
Dependent Claim
216 words
The information recording and reproduction apparatus as set forth in claim 10, further comprising: third buffer memory means for temporarily storing reproduced data, said third buffer memory means being provided in a reproduction system for reproducing continuous information from said recording medium, and being arranged so as to be followed by said first buffer memory means; fourth buffer memory means for temporarily storing recording data, said fourth buffer memory means being provided in a recording system for recording continuous information on said recording medium, and being arranged so as to be in advance of said fourth buffer memory means; and control means for setting a first transmission speed as a writing speed of said third buffer memory means and a second transmission speed, which is slower than the first transmission speed, as a reading speed of said third buffer memory means, and for setting the second transmission speed as a writing speed of said fourth buffer memory means and the first transmission speed as a reading speed of said fourth buffer memory means, and further for writing of data with respect to said third buffer memory and reading data out of said fourth buffer memory means alternately, whereby simultaneous recording and reproduction is carried out with respect to arbitrary different radial positions on said recording medium.
Claim 12
Independent Claim
187 words
A method for simultaneous recording and reproduction of information with respect to arbitrary different portions on a disk-shaped recording medium wherein position information for recording and reproduction operations is pre-recorded over the whole surface thereof based on the CLV control, comprising the steps of: (a) detecting the position information for recording and reproduction operations; (b) temporarily storing information to be recorded on the recording medium; (c) temporarily storing reproduced information from the recording medium; (d) rotating the recording medium at a first rotation speed during recording and reproducing of information with respect to a first radial position on the recording medium, and rotating the recording medium such that a rotation speed during recording and reproduction of information with respect to a second radial position on the recording medium coincides with the first rotation speed; and (e) compensating respective reading speeds of said steps (b) and (c) according to the detected position information for recording and reproduction during recording and reproducing of information with respect to the second radial position such that the recording and reproduction of information is equivalent to that based on the constant linear velocity.
Claim 13
Dependent Claim
141 words
The method as set forth in claim 12, wherein said step (e) includes the step of: compensating reading speed V R such that recording of information with respect to the second radial position is carried out upon completion of reproduction of information from the first radial position by satisfying an equation of V R = V W × (N₂/N₁), where N₁ indicates a rotation speed of the recording medium during reproduction of the first radial position, N₂ indicates a rotation speed, which is derived from a rotation speed of the second radial position, during reproduction of the second radial position based on the CLV control, V W indicates a writing speed at which information to be recorded on the second radial position is temporarily stored, and V R indicates the reading speed at which the temporarily stored information is read out.
Claim 14
Dependent Claim
143 words
The method as set forth in claim 12, wherein said step (e) includes the step of: compensating reading speed V₂ such that reproduction of information from the second radial position is carried out upon completion of reproduction of information from the first radial position by satisfying an equation of V₂= V₀ × (N₂/N₁), where N₁ indicates a rotation speed of the recording medium during reproduction of the first radial position, N₂ indicates a rotation speed, which is derived from a rotation speed of said second radial position, during reproduction of the second radial position based on the CLV control, V₀ indicates a constant speed at which temporarily stored information is read out when the recording medium rotates based on the CLV control, and V₂ indicates the reading speed at which temporarily stored informationin is read out during reproduction of said second radial position.
Claim 15
Dependent Claim
20 words
The information recording and reproduction apparatus as set forth in claim 1, wherein said recording medium is a compact disk.
Claim 16
Dependent Claim
20 words
The information recording and reproduction apparatus as set forth in claim 1, wherein said recording medium is a magneto-optical disk.
Claim 17
Dependent Claim
50 words
The information recording and reproduction apparatus as set forth in claim 1 is used for an apparatus, which is employed as a computer-use external memory apparatus, selected from the group consisting of an optical disk apparatus, a hard disk apparatus, a floppy disk apparatus, and a magnetic tape recording apparatus.
Claim 18
Dependent Claim
216 words
Apparatus for recording and reproducing information with respect to a recording disc which is pre-recorded over a recording area thereof with position information for use in CLV control, the apparatus comprising: position information detection means for detecting said position information so as to determine the current position of a recording/reproduction head relative to the disc; recording-use memory means for temporarily storing information to be recorded on said recording disc; reproduction-use memory means for temporarily storing reproduced information from said recording disc; rotation speed control means for controlling the speed of rotation of said recording disc; reading speed control means for controlling the speed at which information is read from said recording-use and reproduction-use memory means; and operation control means operable in a simultaneous reproducing and recording mode of operation of the apparatus to cause the rotation speed control means to effect rotation of the disc at the same rotational speed for a plurality of different radial positions of the recording/reproduction head on the disc, and to cause the reading speed control means to set the relative reading speeds of the recording-use and reproduction-use memory means in accordance with the detected position information so as to compensate for the radial separation of said different radial positions and thereby maintain operation in said mode equivalent to CLV operation.
Claim 19
Dependent Claim
70 words
A disc reproducing/recording apparatus which is operable in a simultaneous reproducing and recording mode, and in which operation in said mode is maintained equivalent to CLV operation despite recording/reproducing information at different radial positions on the disc at the same rotational speed, by compensating the relative reading speeds for recording-use and reproduction-use buffer memories which temporarily store information which is, respectively, to be recorded on and read from said disc.
References Cited (Backward Citations)
EP0299573A1
Cited
EP0504429A1
Cited
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