EP0236944A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method and system for playing back information recorded on a recording disk
Assignee: Pioneer Corp
•
Filing: 1987-03-05
•
Granted: —
•
Expires: 2007-03-05
Abstract
Abstract Method and system for playing back information recorded on a non-CAV type recording disk use a memory device capable of recording information of at least one field of video signal. An information reading point of a pickup device is moved by a track jump operation repeated ly at intervals of N (N being a natural number) times of rotation of the recording disc, across M (M being a multiple of N including N) recording tracks. Portions of information picked up during periods between each track jump operation is written in the memory device in order and then read in succession, to provide a playback information for a special playback operation such as a still picture playback operation or fast speed playback operations.
Inventors
- 👤 Shin-Ichi Kojima
- 👤 Takashi Okano
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 12:00
CPC Classifications
G; G11; G11B; G11B27/00; G11B27/005; H; H04; H04N; H04N5/00; H04N5/76; H04N5/7605; H04N5/91; H04N5/93; G11B2220/00; G11B2220/20
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
157 words
A method for playing back information recorded on a non-CAV type recording disk, said method using a pickup device having an information reading point and a memory device having a memory capacity for recording information corresponding to at least one field of video signal, comprising steps of: moving said information reading point of said pickup device by a track jump operation in a radial direction of said recording disk repeatedly at intervals of N (N being a natural number) times of rotation of said recording disk across M (M being a multiple of N including N) recording tracks on said recording disk, in response to a command of a special playback operation; writing predetermined portions of information picked up by said pickup device during periods between each of said track jump operation into said memory device in order; and reading information stored in said memory device in succession, to provide playback information for said special playback operation.
Claim 2
Independent Claim
157 words
A method for playing back information recorded on a non-CAV type recording disk, said method using a pickup device having an information reading point and a memory device having a memory capacity for recording information corresponding to at least one field of video signal, comprising steps of: moving said information reading point of said pickup device by a track jump operation in a radial direction of said recording disk repeatedly at intervals of N (N being a natural number) times of rotation of said recording disk across M (M being a multiple of N including N) recording tracks on said recording disk, in response to a command of a special playback operation; writing predetermined portions of information picked up by said pickup device during periods between each of said track jump operation into said memory device in order; and reading information stored in said memory device in succession, to provide playback information for said special playback operation.
Claim 3
Dependent Claim
41 words
A method as set forth in claim 1, further comprising a step for determining a direction of said movement of said information reading point in said radial direction of said recording disk, according to said command for said special playback operation.
Claim 4
Dependent Claim
60 words
A method as set forth in claim 1, wherein said special playback operation is a still picture playback operation, and wherein said step for moving said information reading point of said pickup device moves back said information reading point across N recording tracks by said track jump operation repeatedly at intervals of N times of rotation of said recording disk.
Claim 5
Dependent Claim
94 words
A method as set forth in claim 1, wherein said special playback operation is a K (K being a natural number) times fast speed forward playback operation, and wherein said step for moving said information reading point of said pickup device moves said information reading point in a forward direction across N (K + 1) recording tracks by said track jump operation repeatedly at intervals of N times of rotation of said recording disk, and wherein said reading step is performed while said predetermined portions of said information is written by said writing step.
Claim 6
Dependent Claim
94 words
A method as set forth in claim 1, wherein said special playback operation is a K (K being a natural number) times fast speed reverse playback operation, and wherein said step for moving said information reading point of said pickup device moves said information reading point in a reverse direction across N (K - 1) recording tracks by said track jump operation repeatedly at intervals of N times of rotation of said recording disk, and wherein said reading step is performed while said perdetermined portions of said information is written by said writing step.
Claim 7
Dependent Claim
68 words
A method as set forth in claim 1, wherein said step for moving said information reading point moves said information reading point by said track jump operation to a position of said recording track determined so that a time period required for stabilizing a time base error of said information caused by said track jump operation remains before a start of writing of information by said writing step.
Claim 8
Dependent Claim
31 words
A method as set forth in claim 1, wherein said number N is varied according to said position of said information reading pointing said radial direction of said information recording disk.
Claim 9
Independent Claim
161 words
A system for playing back information recorded on a non-CAV type recording disk, said system using a pickup device having an information reading point and a memory device having a memory capacity for recording information corresponding to at least one field of video signal, comprising: means for moving said information reading point of said pickup device by a track jump operation in a radial direction of said recording disk repeatedly at intervals of N (N being a natural number) times of rotation of said recording disk across M (M being a multiple of N including N) recording tracks on said recording disk, in response to a command of a special playback operation; means for writing predetermined portions of information picked up by said pickup device during periods between each of said track jump operation into said memory device in order; and means for reading information stored in said memory device in succession, to provide playback information for said special playback operation.
Claim 10
Independent Claim
161 words
A system for playing back information recorded on a non-CAV type recording disk, said system using a pickup device having an information reading point and a memory device having a memory capacity for recording information corresponding to at least one field of video signal, comprising: means for moving said information reading point of said pickup device by a track jump operation in a radial direction of said recording disk repeatedly at intervals of N (N being a natural number) times of rotation of said recording disk across M (M being a multiple of N including N) recording tracks on said recording disk, in response to a command of a special playback operation; means for writing predetermined portions of information picked up by said pickup device during periods between each of said track jump operation into said memory device in order; and means for reading information stored in said memory device in succession, to provide playback information for said special playback operation.
Claim 11
Dependent Claim
40 words
A system as set forth in claim 8, further comprising means for determining a direction of said movement of said information reading point in said radial direction of said recording disk, according to said command for said special playback operation.
Claim 12
Dependent Claim
60 words
A system as set forth in claim 8, wherein said special playback operation is a still picture playback operation, and wherein said means for moving said information reading point of said pickup device move back said information reading point across N recording tracks by said track jump operation repeatedly at intervals of N times of rotation of said recording disk.
Claim 13
Dependent Claim
98 words
A system as set forth in claim 8, wherein said special playback operation is a K (K being a natural number) times fast speed forward playback operation, and wherein said means for moving said information reading point of said pickup device move said information reading point in a forward direction across N (K + 1) recording tracks by said track jump operation repeatedly at intervals of N times of rotation of said recording disk, and wherein reading of information by said reading means is performed while said predetermined portions of said information is written by said writing means.
Claim 14
Dependent Claim
98 words
A system as set forth in claim 8, wherein said special playback operation is a K (K being a natural number) times fast speed reverse playback operation, and wherein said means for moving said information reading point of said pickup device moves said information reading point in a reverse direction across N (K -1) recording tracks by said track jump operation repeatedly at intervals of N times of rotation of said recording disk, and wherein said reading of information by said reading means is performed while said predetermined portions of said information is written by said writing means.
Claim 15
Dependent Claim
68 words
A system as set forth in claim 8, wherein said means for moving said information reading point moves said information reading point by said track jump operation to a position of said recording track determined so that a time period required for stabilizing a time base error of said information caused by said track jump operation remains before a start of writing of information by said writing means.
Claim 16
Dependent Claim
32 words
A system as set forth in claim 8, wherein said number N is varied according to said position of said information reading point in said radial direction of said information recording disk.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.