Patent EP0199425A1 successfully refreshed from Google Patents.
EP0199425A1
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Record carrier and apparatus for manufacturing such a record carrier
Assignee: Koninklijke Philips NV
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Filing: 1986-04-23
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Granted: —
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Expires: 2006-04-23
Abstract
Abstract When a CLV disc (= Constant Linear Velocity) is used, which is normally played with a speed which is inversely proportional to the playing radius so as to obtain a monotonic reproduction, special effects can be realised by dividing the disc into sectors within which the revolution number is constant and which contain an integral number of fields within an integral number of tracks.
Inventors
- 👤 Johannes Christiaan Van Lier
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 11:44
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/7605; G; G11; G11B; G11B19/00; G11B19/20; G11B19/28; G11B7/00; G11B7/007; G11B7/00745; G11B7/08; G11B7/085; G11B7/08505
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
181 words
A record carrier for the storage of video informa tion arranged in fields in substantially spiral tracks, the tracks being arranged on the record carrier in such a way that for a playing mode in which the fields succeed one another monotonically the velocity along the tracks is substantially constant so that in such a playing mode the rate of revolution is substantially inversely proportional to the playing radius, characterized in that the record carrier is radially divided into a plurality of at least two sectors within which an integral number of N fields are recorded on an integral number of T tracks, which sectors each have a length equal to a multiple of T tracks, T not being a submultiple of N, so that after every T tracks the field-synchronizing pulses are radially aligned to enable jumps by T tracks and, consequently, N fields to be made, which record carrier is played with a constant rate of revolution within said sectors for monotonic reproduction, said sectors being separated by transitional areas in which the rate of revolution is changed gradually.
Claim 2
Dependent Claim
181 words
A record carrier for the storage of video informa tion arranged in fields in substantially spiral tracks, the tracks being arranged on the record carrier in such a way that for a playing mode in which the fields succeed one another monotonically the velocity along the tracks is substantially constant so that in such a playing mode the rate of revolution is substantially inversely proportional to the playing radius, characterized in that the record carrier is radially divided into a plurality of at least two sectors within which an integral number of N fields are recorded on an integral number of T tracks, which sectors each have a length equal to a multiple of T tracks, T not being a submultiple of N, so that after every T tracks the field-synchronizing pulses are radially aligned to enable jumps by T tracks and, consequently, N fields to be made, which record carrier is played with a constant rate of revolution within said sectors for monotonic reproduction, said sectors being separated by transitional areas in which the rate of revolution is changed gradually.
Claim 3
Dependent Claim
93 words
A record carrier as claimed in Claim 1, characterized in that the transitional areas between the sectors are divided into segments which are also played with a constant rate of revolution in order to obtain a monotonic picture reproduction and which also comprise an integral number of fields within an integral number of tracks, but which extend over a substantially smaller radial distance, whilst after every transition between two segments or between a sector and a segment a specific field-synchronizing pulse appears which is radially aligned with a field-synchronizing pulse preceding said transition.
Claim 4
Dependent Claim
29 words
A record carrier as claimed in Claim 2, characterized in that the video signal contains information relating to the location of said specific field-synchronizing pulse after such a transition.
Claim 5
Dependent Claim
26 words
A record carrier as claimed in Claim 3, characterized in that the video signal also contains information relating to the instantaneous magnitude of the parameter T.
Claim 6
Dependent Claim
32 words
A playing apparatus for playing a record carrier as claimed in Claim 1, characterized by means for playing said record carrier with a constant but different rate of revolution in each sector.
Claim 7
Independent Claim
98 words
An apparatus for manufacturing a record carrier as claimed in any one of Claims 1 to 4, characterized by means for changing the rate of revolution of the record carrier on which the video signal is recorded sectorwise, in such a way that the record carrier is driven with a constant but different rate of revolution in each sector in such a way that a constant number of N fields of the video signal to be recorded is recorded in T tracks, T not being a submultiple of N, such a sector being substantially longer than T tracks.
Claim 8
Dependent Claim
105 words
An apparatus as claimed in Claim 6, characterized by means for varying the rate of revolution stepwise from sector to sector, the parts between said steps on the record carrier corresponding to segments within which the rate of revolution is constant and within which an integral number of fields N are recorded in an integral number of tracks T, but with an overall length which is substantially smaller than the length of the sector, in such a way that after a step in the rate of revolution a specific field-synchronizing pulse is recorded which is radially aligned with a specific field-synchronizing pulse preceding said step.
Claim 9
Dependent Claim
80 words
An apparatus as claimed in Claim 7, characterized in that a gradual step between two segments or between a segment and a sector is obtained by applying a signal with a stepwise frequency variation, corresponding to the desired variation of the parameter T/N and hence in the rate of revolution, to a control loop which determines the rate of revolution of the record carrier via a slow phase-locked loop, so that the rate of revolution gradually follows said frequency step.
Claim 10
Dependent Claim
79 words
An apparatus as claimed in Claim 8, characterized in that said frequency step appears N, fields after a specific field-synchronizing pulse in a sector or segment in which N = N,, and KN 2 fields before a specific field-synchronizing pulse situated in a subsequent sector or segment where N = N 2 and K is an integer, so that said two field-synchronizing pulses, which are situated at a distance N, + KN 2 from each other, are radially aligned.
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