EP0396285A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Recording/reproducing compressed data on a rotatable record medium
Assignee: Sony Corp
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Filing: 1990-04-20
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Granted: —
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Expires: 2010-04-20
Abstract
Abstract Image data is recorded in successive turns on a rotatable record medium driven at substantially constant linear velocity by converting a first of successive image frames of image data to an intraframe code signal, converting the (n-1) next-following frames to (n-1) interframe code signals, and recording the intraframe and (n-1) interframe code signals on the record medium. In one embodiment, n is the maximum number of image frames that can be recorded in the innermost turn of the record medium and n is constant for all turns, whereby the same number (n-1) of interframe code signals separate successive intraframe code signals from turn to turn. In another embodiment, n is a variable and increases as the radius of the turn in which the code signals are recorded increases, whereby a larger number (n-1) of interframe code signals separate successive intraframe code signals as the turn radius increases. The recorded image data is recovered by reproducing the recorded intraframe and interframe code signals and selectively coupling the reproduced code signals to an intraframe decoder or to an interframe decoder as a function or whether intraframe or interframe code signals are reproduced.
Inventors
- 👤 Jun C/O Sony Corporation Yonemitsu
- 👤 Yoichi C/O Sony Corporation Yagasaki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 20:16
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/12; H; H04; H04N; H04N19/00; H04N19/50; H04N19/503; G11B21/00; G11B21/02; G11B21/08; G11B21/081; G11B27/00; G11B27/005; G11B27/02; G11B27/031; G11B27/034; G11B27/10; G11B27/102; G11B27/105; H04N5/00; H04N5/76; H04N5/91; H04N5/92; H04N5/926; H04N5/9261; H04N5/9262; H04N5/9264; G11B2220/00; G11B2220/20; G11B2220/21; G11B2220/213; G11B2220/25; G11B2220/2537; G11B2220/2545; G11B27/19; G11B27/28; G11B27/30; G11B27/3027; H04N5/78; H04N5/782; H04N5/783; H04N5/84; H04N5/85
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
182 words
A method of recording image data in successive tracks on a rotatable medium (10, 30) driven such that the relative velocity between a record head and that portion of the medium being recorded on is substantially constant, the method comprising: receiving (32) successive image frames (F1, F2, ...) of said image data; converting (34, 36, 37a, 38, 44, 46, 48, 50) a first image frame of image data to an intraframe code signal (F1, Fig. 1; F1, F8, ...F73, F85, Fig. 4); and converting (34, 36, 37b, 45, 38, 44, 46, 48, 50) (n-1) succeeding image frames (F2-F7) of image data to (n-1) interframe code signals (F2-F6, Fig. 1; F2-F7, F9-F14, ...F74-F84, F86-F96, Fig. 4), characterized in that n is the maximum number of image frames (F1-F6, Fig. 1; F1-F7, Fig. 4) recordable in an innermost track (T1) of said medium when driven at said substantially constant velocity relative to said record head; and recording (52, 54) the intraframe code signal (F1, Fig. 1; ...F73, Fig. 4) and (n-1) succeeding interframe code signals (F2-F6, Fig. 1; ...F74-F84, Fig. 4) on the medium.
Claim 2
Independent Claim
182 words
A method of recording image data in successive tracks on a rotatable medium (10, 30) driven such that the relative velocity between a record head and that portion of the medium being recorded on is substantially constant, the method comprising: receiving (32) successive image frames (F1, F2, ...) of said image data; converting (34, 36, 37a, 38, 44, 46, 48, 50) a first image frame of image data to an intraframe code signal (F1, Fig. 1; F1, F8, ...F73, F85, Fig. 4); and converting (34, 36, 37b, 45, 38, 44, 46, 48, 50) (n-1) succeeding image frames (F2-F7) of image data to (n-1) interframe code signals (F2-F6, Fig. 1; F2-F7, F9-F14, ...F74-F84, F86-F96, Fig. 4), characterized in that n is the maximum number of image frames (F1-F6, Fig. 1; F1-F7, Fig. 4) recordable in an innermost track (T1) of said medium when driven at said substantially constant velocity relative to said record head; and recording (52, 54) the intraframe code signal (F1, Fig. 1; ...F73, Fig. 4) and (n-1) succeeding interframe code signals (F2-F6, Fig. 1; ...F74-F84, Fig. 4) on the medium.
Claim 3
Dependent Claim
24 words
A method according to claim 1, wherein the step of recording is characterized by recording (n-1) interframe code signals between successive intraframe code signals.
Claim 4
Dependent Claim
24 words
A method according to claim 2, characterized in that the intraframe and interframe code signals are recorded in a spiral track of successive turns.
Claim 5
Independent Claim
52 words
A method according to any one of the preceding claims, wherein each track is comprised of a number of data frames (Figs. 2 and 5), and characterized in that an intraframe code signal is recorded in plural data frames and (n-1) interframe code signals are recorded in less than (n-1) data frames.
Claim 6
Independent Claim
26 words
A method according to any one of the preceding claims, characterized in that intraframe code signals are recorded at locations proximate each other in successive tracks.
Claim 7
Dependent Claim
30 words
A method according to claim 2, characterized in that n is a variable and increases as the radius of the track in which said interframe code signals are recorded increases.
Claim 8
Dependent Claim
19 words
A method according to claim 6, characterized in that only one intraframe code signal is recorded in a track.
Claim 9
Dependent Claim
75 words
A method according to claim 7, characterized in that an integral number of image frames are recorded in an equal number of data frames (Figs. 2 and 5), with said intraframe code signal (F1, F8, ...F73, F85...) being recorded in plural data frames in a turn and the remaining data frames in that turn having recorded therein interframe code signals which follow said intraframe code signal (F2-F6, Fig. 1; F2-F7, F9-F14, ...F74-F84, ..., Fig. 4).
Claim 10
Independent Claim
61 words
A method according to any one of the preceding claims characterized in that an image frame of image data is converted to an interframe code signal by comparing (60, 62, 35) one frame of image data to a preceding frame of image data and encoding (38, 44, 46, 48) the differences therebetween such that said interframe code signal represents said differences.
Claim 11
Independent Claim
215 words
A method of reproducing image data from successive turns (T1, T2, ...T121, T122...) and a rotatable record medium (10, 30) driven such that the relative velocity between a read head and that portion of the medium being read is substantially constant, wherein said image data is recorded as an intraframe code signal (F1, Fig. 1; F1, F8, ...F73, F85 ...Fig. 4) representing an image frame followed by a number of successive interframe code signals representing an equal number of successive image frames, said method comprising: reproducing (12, 14, 16, 18, 20; 72, 74, 76, 78, 80, 82) the intraframe and interframe code signals in each turn; coupling (22; 86, 90) the reproduced code signals to an intraframe decoder (24; 84, 90, 92) to recover image data therefrom; and coupling (22; 86, 90) the reproduced code signals to an interframe decoder (26; 88, 90, 84) to recover image data therefrom; characterized in that the number of interframe code signals between successive intraframe code signals is at least as large as the number of interframe code signals that can be recorded in the innermost turn of the record medium, and the reproduced code signals are changed over between the intraframe decoder and the interframe decoder as a function of whether intraframe or interframe code signals are reproduced.
Claim 12
Independent Claim
215 words
A method of reproducing image data from successive turns (T1, T2, ...T121, T122...) and a rotatable record medium (10, 30) driven such that the relative velocity between a read head and that portion of the medium being read is substantially constant, wherein said image data is recorded as an intraframe code signal (F1, Fig. 1; F1, F8, ...F73, F85 ...Fig. 4) representing an image frame followed by a number of successive interframe code signals representing an equal number of successive image frames, said method comprising: reproducing (12, 14, 16, 18, 20; 72, 74, 76, 78, 80, 82) the intraframe and interframe code signals in each turn; coupling (22; 86, 90) the reproduced code signals to an intraframe decoder (24; 84, 90, 92) to recover image data therefrom; and coupling (22; 86, 90) the reproduced code signals to an interframe decoder (26; 88, 90, 84) to recover image data therefrom; characterized in that the number of interframe code signals between successive intraframe code signals is at least as large as the number of interframe code signals that can be recorded in the innermost turn of the record medium, and the reproduced code signals are changed over between the intraframe decoder and the interframe decoder as a function of whether intraframe or interframe code signals are reproduced.
Claim 13
Dependent Claim
72 words
A method according to claim 10, wherein a predetermined number (n-1) of interframe code signals are recorded between successive intraframe code signals, and the reproduced code signals are changed over from the interframe decoder to the intraframe decoder after said predetermined number of code signals has been reproduced and the reproduced code signals are changed over from the intraframe decoder to the interframe decoder after an intraframe code signal has been reproduced.
Claim 14
Dependent Claim
49 words
A method according to claim 11, wherein each turn is comprised of several data frames, characterized in that each intraframe code signal is recorded in plural data frames (Figs. 2 and 5) and the predetermined number (n-1) of interframe code signals (F2-F6; F2-F7) is recorded in next-following data frames.
Claim 15
Dependent Claim
25 words
A method according to claim 12, wherein said predetermined number of interframe code signals is recorded in less than said predetermined number of data frames.
Claim 16
Dependent Claim
77 words
A method according to claim 10, 11 or 12, wherein the number (n-1) of interframe code signals recorded between successive intraframe code signals (F1, F8, ...F73, F85) varies with the radius of the turn in which said interframe code signals are recorded, and the change over of the reproduced code signals between the intraframe decoder and the interframe decoder is controlled as a function of the radius of the turn from which the code signals are reproduced.
Claim 17
Dependent Claim
44 words
A method according to claim 14, wherein only one intraframe code signal (F1, F8, ...F73, F85) is recorded in a turn, and the reproduced code signals are changed over from the intraframe decoder to the interframe decoder after an intraframe code signal is reproduced.
Claim 18
Independent Claim
47 words
A method according to any one of claims 10 to 15, wherein the intraframe code signal and/or the interframe code signal includes identifying data; and the reproduced code signals are coupled to said intraframe decoder or to said interframe decoder in response to detected (78) identifying data.
Claim 19
Dependent Claim
179 words
An apparatus for carrying out the method of claim 1, comprising: input means (32) for receiving successive image frames of said image data; intraframe encoding means (34, 36, 37a, 38, 44, 46, 48, 50) for converting a first image frame of image data to an intraframe code signal (F1, Fig. 1; F1, F8, ...F73, F85, Fig. 4); and interframe encoding means (34, 36, 37b, 45, 38, 44, 46, 48, 50) for converting (n-1) succeeding image frames of image data to (n-1) interframe code signals (F2-F6, Fig. 1; F2-F7, F9-F14, ...F74-F84, F86-F96, Fig. 4), characterized in that n is the maximum number of image frames (F1-F6, Fig. 1; F1-F7, Fig. 4) recordable in an innermost turn (T1) of said medium (10, 30) driven such that the relative velocity between a record head and that portion of the medium being recorded on is substantially constant; and an intraframe code signal (F1, Fig. 1; F1, F8, ...F73, Fig. 4) and (n-1) succeeding interframe code signals (F2-F6, Fig. 1; F2-F7, ...F74-F84, Fig. 4) are recorded on the medium by recording means (52, 58).
Claim 20
Dependent Claim
20 words
An apparatus according to claim 17, wherein the recording means records (n-1) interframe code signals between successive intraframe code signals.
Claim 21
Dependent Claim
24 words
An apparatus according to claim 18, wherein the recording means records the intraframe and interframe code signals in a spiral track of successive turns.
Claim 22
Dependent Claim
53 words
An apparatus according to claim 17 or 18, wherein each turn is comprised of a number of data frames (6, 7), and characterized in that the recording means records an intraframe code signal in plural data frames and records (n-1) interframe code signals in less than (n-1) data frames (Figs. 2 and 5).
Claim 23
Dependent Claim
26 words
An apparatus according to claim 17 or 20, characterized in that the recording means records intraframe code signals at locations proximate each other in successive turns.
Claim 24
Dependent Claim
30 words
An apparatus according to claim 18, characterized in that n is a variable and increases as the radius of the turn in which said interframe code signals are recorded increases.
Claim 25
Dependent Claim
21 words
An apparatus according to claim 22, characterized in that the recording means records only one intraframe code signal in a turn.
Claim 26
Dependent Claim
210 words
An apparatus for carrying out the method of claim 10 to recover image data from successive turns on a rotatable record medium driven such that the relative velocity between a read head and that portion of the medium being read is substantially constant, wherein the image data is recorded as an intraframe code signal representing an image frame followed by a number of successive interframe code signals representing an equal number of successive image frames, comprising: playback means (12, 14, 16, 18, 20; 72, 74, 76, 78, 80, 82) for reproducing the intraframe and interframe code signals in each turn, intraframe decoder means (24; 84, 86, 90, 92) for recovering image data from the reproduced code signals, and interframe decoder means (26; 84, 88, 90) for recovering image data from the reproduced code signals; characterized in that the number of interframe code signals (F2-F6; F2-F7, F9-F14, ...F74-F84) recorded between successive intraframe code signals (F1; F1, F8, ...F73, F83) is at least as large as the capacity of interframe code signals recordable in the innermost turn; and coupling means (22, 28; 86, 90) couples the reproduced code signals to the intraframe decoder means or to the interframe decoder means as a function of whether intraframe or interframe code signals are reproduced.
Claim 27
Dependent Claim
81 words
An apparatus according to claim 24, wherein a fixed number of interframe code signals is recorded between successive intraframe code signals, and the coupling means includes change-over means for changing over the reproduced code signals from the interframe decoder means to the intraframe decoder means after said fixed number of code signals has been reproduced and for changing over the reproduced code signals from the intraframe decoder means to the interframe decoder means after an intraframe code signal has been reproduced.
Claim 28
Dependent Claim
62 words
An apparatus according to claim 24, wherein the number of interframe code signals recorded between successive intraframe code signals varies with the radius of the turn in which said interframe code signals are recorded, and the coupling means includes control means for controlling said coupling means as a function of the radius of the turn from which the code signals are reproduced.
Claim 29
Dependent Claim
88 words
An apparatus according to claim 26, wherein the number of interframe code signals recorded between successive intraframe code signals increases as the radius of the turn in which said interframe code signals are recorded increases, and the control means changes over the coupling of the reproduced code signals from the interframe decoder means to the intraframe decoder means after a variable number of interframe code signals has been reproduced, said variable number being determined by the radius of the turn from which the interframe code signals are reproduced.
Claim 30
Dependent Claim
44 words
An apparatus according to claim 27, wherein only one intraframe code signal is recorded in a turn, and the control means changes over the reproduced code signals from the intraframe decoder means to the interframe decoder means after an intraframe code signal is reproduced.
Claim 31
Dependent Claim
55 words
An apparatus according to claim 24, wherein the intraframe code signal and/or the interframe code signal includes identifying data; and the coupling means includes means for detecting said identifying data and for supplying the reproduced code signals to the intraframe decoder means or to the interframe decoder means in response to the detected identifying data
Claim 32
Independent Claim
27 words
An apparatus according to any one of claims 24 to 29 characterized in that intraframe code signals are recorded at locations proximate each other in successive turns.
References Cited (Backward Citations)
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