Patent EP0023767A1 successfully refreshed from Google Patents.
EP0023767A1
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EP
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Video player/recorder for recording on a blank disk and method for home recording
Assignee: Discovision Associates
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Filing: 1980-07-02
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Granted: —
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Expires: 2000-07-02
Abstract
Abstract A blank disc (12) for a home video player/recorder has two or more reference tracks (41, 42) that are formed with the precision of a factory record and under the controlled environmental conditions of disc replication in a factory. When the disc is loaded into the player/recorder for a write operation, the player/recorder reads the reference tracks and simultaneously samples the track error signal and stores the error signal values in the data store of a processor. During the actual write operation, the processor operates on the stored values to generate a control signal to position the write head to define a track that follows the shape of the two adjacent reference tracks in proportion to the spacing of the track (40) between the reference tracks. Thus the player/recorder follows the precision factory reference tracks in spite of track distortion that usually occurs in a home redorder and in a home recording environment, and the track distortion of the home recorded disc is limited to about the track distortion of a factory recording.
Inventors
- 👤 Robert Charles Green
- 👤 Gertrude Kappel
- 👤 Daniel John Stigliani Jr.
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 23:35
CPC Classifications
G; G11; G11B; G11B21/00; G11B21/02; G11B21/10; G11B21/106; G11B23/00; G11B23/30; G11B27/00; G11B27/10; G11B7/00; G11B7/08; G11B7/09; G11B7/095; G11B7/0953
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
21 words
A blank recording disc (12) suitable for use in a home video disc player/recorder having one or more reference tracks (41,42).
Claim 2
Dependent Claim
21 words
A blank recording disc (12) suitable for use in a home video disc player/recorder having one or more reference tracks (41,42).
Claim 3
Dependent Claim
43 words
A blank disc as claimed in Claim 1 comprising an outer reference track and an inner reference track at the radially inner and outer edges of the recordable surface, which is substantially free for home recording in the area between the reference tracks.
Claim 4
Dependent Claim
35 words
A blank disc as claimed in Claim 1 or Claim 2 wherein at least one of the reference tracks contains information readable by the home player/recorder identifying the number of reference tracks and their location.
Claim 5
Dependent Claim
35 words
A blank disc as claimed in any preceding claim wherein the reference tracks are formed independently of the recording properties of the disc, for example by vapour deposition of metal or mechanical scribing or stamping.
Claim 6
Dependent Claim
148 words
A home video player/recorder for recording on a disck having at least one reference track, the player/recorder being arranged to rotate a disc (12) in relation to a read and/or write head (15), and to produce a track error signal, and having tracking means (26) responsive to the track error signal for positioning the head to follow a track, and being arranged to produce a signal (32) defining the angular position of a disc mounted on the player/ recorder, a processor (70) connected to receive the error signal (69)and the angular position signal during an initial read operation on a reference track on a newly-mounted disc, and to store error signal values at predetermined address locations in a data store (73), the processor being connected to supply to the positioning means during a write operation, error signals derived from the store in synchronism with the angular position signal.
Claim 7
Dependent Claim
148 words
A home video player/recorder for recording on a disck having at least one reference track, the player/recorder being arranged to rotate a disc (12) in relation to a read and/or write head (15), and to produce a track error signal, and having tracking means (26) responsive to the track error signal for positioning the head to follow a track, and being arranged to produce a signal (32) defining the angular position of a disc mounted on the player/ recorder, a processor (70) connected to receive the error signal (69)and the angular position signal during an initial read operation on a reference track on a newly-mounted disc, and to store error signal values at predetermined address locations in a data store (73), the processor being connected to supply to the positioning means during a write operation, error signals derived from the store in synchronism with the angular position signal.
Claim 8
Dependent Claim
41 words
A player/recorder as claimed in Claim 5 for a disc having two spaced-apart reference tracks, in which the derived error signals accord with the shape of the two reference tracks in proportion to the spacing of the head between the tracks.
Claim 9
Dependent Claim
59 words
A player/recorder as claimed in Claim 5 or Claim 6, wherein the processor includes means for positioning the head according to a track address (75) and the player/recorder.includes means for reading track addresses andjother control information from a disc track and the processor includes means for selecting a next reference track from information contained in a preceding reference track.
Claim 10
Dependent Claim
60 words
A player/recorder as claimed in any of Claims 5-7 including means defining a track address of a track being written and wherein said processor derives the error signal from the store according to the address of two adjacent reference tracks and the corresponding stored error signal values and at least a portion of the address of the track being written.
Claim 11
Independent Claim
107 words
A method of making a home video disc recording in which a blank disc (12) carrying one or more reference tracks (41,42 ) is positioned on the table (12) of a recorder, and - in an initial read operation - error signal values are derived from the reference track or tracks and stored in a store (73) together with angular position signals obtained during the initial read operation; and in which during a subsequent recording operation the position of a writing head (15) in relation to the disc is controlled using signals derived from the store in synchronism with angular position signals obtained during the writing operation.
Claim 12
Independent Claim
107 words
A method of making a home video disc recording in which a blank disc (12) carrying one or more reference tracks (41,42 ) is positioned on the table (12) of a recorder, and - in an initial read operation - error signal values are derived from the reference track or tracks and stored in a store (73) together with angular position signals obtained during the initial read operation; and in which during a subsequent recording operation the position of a writing head (15) in relation to the disc is controlled using signals derived from the store in synchronism with angular position signals obtained during the writing operation.
Claim 13
Dependent Claim
48 words
A method as claimed in Claim 9 in which the disc has two spaced reference tracks and in which the derived signals used during the writing operation accord with the shape of the reference tracks (Ri,Ro) in proportion to the spacing (Rx) of the head between the tracks.
References Cited (Backward Citations)
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