EP0152141A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
System for playing back a programme recorded on a disc-shaped record carrier
Assignee: Koninklijke Philips NV
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Filing: 1985-02-07
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Granted: —
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Expires: 2005-02-07
Abstract
Abstract In order to enable film frames of a film standard in which the number of film frames per second differs from the number of video pictures per second of the television standard in use with a gain of playing time, to allow still-picture operation on every turn, and to enable the picture numbers to be inserted on one radius, it is proposed to record one film frame as two video fields in every turn of the disc and to bring the number of video fields reproduced per second into conformity with the specified number of film frames per second by means of a pattern of forward and' backward jumps effected during reproduction from the
Inventors
- 👤 Johannes Christiaan Van Lier
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 17:47
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/92; G; G11; G11B; G11B27/00; G11B27/005; H04N5/7605; H04N7/00; H04N7/01; H04N7/0112; G11B2220/00; G11B2220/20
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
255 words
A system for playing back a programme of consecutive film frames recorded on a disc-shaped record carrier, which system comprises a read apparatus for scanning the record carrier, which record carrier has been provided with a substantially spiral-shaped or concentric ring-shaped information track in which the programme has been recorded as a video signal in a sequence of two fields in every turn of the track, requiring n film frames per unit of the time to be reproduced in order to realize reproduction with the original frame speed, the nominal playback speed of the record carrier being m video pictures of two fields per unit of time, with m > n, which read apparatus comprises means for moving the scanning point of the record carrier forwards or backwards in a substantially radial direction over a distance corresponding to the radial displacement over at least one revolution, characterised in that for each film frame recorded only two consecutive fields are recorded and during read-out the scanning point is moved backwards and/or forwards to a preceding and a following turn of a track, respectively in conformity with a predetermined pattern, which turn is situated at a distance corresponding to at least the radial displacement over one revolution in such a way that each time consecutive film frames are reproduced as consecutive sets of at least two fields corresponding to the same film frame, the number of film frames reproduced per unit of time being the specified number n and the number of video pictures reproduced being m.
Claim 2
Independent Claim
255 words
A system for playing back a programme of consecutive film frames recorded on a disc-shaped record carrier, which system comprises a read apparatus for scanning the record carrier, which record carrier has been provided with a substantially spiral-shaped or concentric ring-shaped information track in which the programme has been recorded as a video signal in a sequence of two fields in every turn of the track, requiring n film frames per unit of the time to be reproduced in order to realize reproduction with the original frame speed, the nominal playback speed of the record carrier being m video pictures of two fields per unit of time, with m > n, which read apparatus comprises means for moving the scanning point of the record carrier forwards or backwards in a substantially radial direction over a distance corresponding to the radial displacement over at least one revolution, characterised in that for each film frame recorded only two consecutive fields are recorded and during read-out the scanning point is moved backwards and/or forwards to a preceding and a following turn of a track, respectively in conformity with a predetermined pattern, which turn is situated at a distance corresponding to at least the radial displacement over one revolution in such a way that each time consecutive film frames are reproduced as consecutive sets of at least two fields corresponding to the same film frame, the number of film frames reproduced per unit of time being the specified number n and the number of video pictures reproduced being m.
Claim 3
Dependent Claim
77 words
A system as claimed in Claim 1, characterised in that n = 24 and m = 30 and said pattern is such that for every cycle of four film frames two sets of two fields belonging to a different film frame and two sets of three fields belonging to a different film frame are reproduced by reproducing two of the eight recorded fields belonging to said four film frames twice every cycle in conformity with said pattern.
Claim 4
Dependent Claim
50 words
A system as claimed in Claim 1, characterised in that in said cycle of four film frames, corresponding to ten reproduced fields, a backward jump over two fields is effected after every fourth and every sixth field and a forward jump over two fields is effected after every fifth field.
Claim 5
Dependent Claim
55 words
A system as claimed in Claim 2, characterised in that in said cycle of four film frames, corresponding to ten reproduced fields, a backward jump over two fields is effected after every fourth, every sixth and every eigth field and a forward jump over two fields is effected after every fifth and every seventh field.
Claim 6
Dependent Claim
112 words
A read apparatus for use in a system as claimed in any one of the preceding Claims, comprising means for moving the scanning point of the record carrier forwards or backwards in a substantially radial direction over at least a distance which corresponds to the radial displacement over one turn, characterised by means for generating such a predetermined pattern of forward or backward jumps that consecutive film frames are reproduced as consecutive sets of at least two fields belonging to the same film frame so that the number of film frames reproduced per unit of time is equal to the specified number n and the number of video pictures reproduced is m.
Claim 7
Dependent Claim
45 words
An apparatus as claimed in Claim 5, characterised in that the means for moving the scanning point in conformity with a predetermined pattern comprise counting means for counting the fields reproduced and generating said pattern as a function of the count of said counting means.
Claim 8
Dependent Claim
69 words
An apparatus as claimed in Claim 5 or 6, characterised in that the means for moving the scanning point in conformity with a predetermined pattern are constructed so that within said cycle of four film frames, corresponding to ten reproduced fields, a backward jump over two fields is effected after every fourth and every sixth field and a forward jump over two fields is effected after every fifth field.
Claim 9
Dependent Claim
74 words
An apparatus as claimed in Claim 5 or 6, characterised in that the means for moving the scanning point in conformity with a predetermined pattern are constructed so that within said cycle of four film frames, corresponding to ten reproduced fields, a backward jump over two fields is effected after every fourth, every sixth and every eighth field and a forward jump over two fields is effected after every fifth and every seventh field.
Claim 10
Dependent Claim
110 words
A record carrier for use in a system as claimed in any one of the Claims 1 to 4, which record carrier has been provided with a spiral information track in which a programme of consecutive film frames has been recorded as a video signal in a sequence of two fields per turn of the track, requiring n film frames per unit of time to be reproduced for a reproduction with the original speed, the nominal playback speed of the record carrier being m video pictures of two fields per unit of time, with m > n, characterised in that only two consecutive fields of each film frame are recorded.
Claim 11
Independent Claim
61 words
A system as claimed in any one of Claims 1 to 4, characterised in that at least the fields to be repeated in conformity with said pattern are provided with at least two sound channels, one of said sound channels being reproduced during the first reproduction of said field and the other sound channel during the second reproduction of said field.
References Cited (Backward Citations)
No citation records indexed.
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