US4170022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and process for recording with variable correction of a television signal having three components
Assignee: Thomson-Brandt SA
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Filing: 1978-02-10
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Granted: 1979-10-02
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Expires: 1998-02-10
Abstract
Abstract A process for recording on a video-disc a television signal comprising a luminance signal, a chrominance signal, and a sound signal, wherein these three signals modulate respectively three carrier-waves. The three modulated carrier-waves are added and then optically recorded onto said video-disc along a spiral track. The level of these three modulated carrier-waves are each processed according to their own correction parameters related to the distance of the recording point from the center of the video-disc, thus allowing the disc to be later read without any correction processing during reading out.
Inventors
- 👤 Sylvain Kretschmer
- 👤 Jean-Pierre Lacotte
- 👤 Pierre Oprandi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:41
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/12; G11B7/125; G11B7/128; G11B20/00; G11B20/02; G11B20/06; G11B20/22; G11B5/00; G11B5/012; H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/93; H04N5/931; H04N5/9315
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
137 words
A process for optically recording on a video-disc a television signal comprising a luminance signal, a chrominance signal, and a sound signal, which process comprises the steps of: moving a recording head along a radius of said video-disc towards the centre of the video-disc; said video-disc being rotating around said centre; modulating three carrier-waves with respectively said luminance signal, chrominance signal, and sound signal; modifying the level of the three modulated carrier-waves according to respectively three different given laws with respect to the distance of said recording head from said centre; summing said three modulated carrier-waves for delivering a recording signal; and controlling said recording head with said summed modulated carrier waves to optically modify the surface of said video-disc along a spiral track defined by the relative motion of said recording head and of said video-disc.
Claim 2
Dependent Claim
137 words
A process for optically recording on a video-disc a television signal comprising a luminance signal, a chrominance signal, and a sound signal, which process comprises the steps of: moving a recording head along a radius of said video-disc towards the centre of the video-disc; said video-disc being rotating around said centre; modulating three carrier-waves with respectively said luminance signal, chrominance signal, and sound signal; modifying the level of the three modulated carrier-waves according to respectively three different given laws with respect to the distance of said recording head from said centre; summing said three modulated carrier-waves for delivering a recording signal; and controlling said recording head with said summed modulated carrier waves to optically modify the surface of said video-disc along a spiral track defined by the relative motion of said recording head and of said video-disc.
Claim 3
Dependent Claim
34 words
A process as claimed in claim 1, wherein the modulation is a frequency modulation, and the modification of the surface includes the writing in of a series of marks having variable length and spacing.
Claim 4
Independent Claim
110 words
An apparatus for optically recording on a video-disc a television signal comprising a luminance signal, a chrominance signal, and a sound signal, which apparatus comprises: means for rotating said video-disc around its centre; means for moving a recording head along a radius of said video-disc towards said centre; means for modulating the three carrier-waves with respectively said luminance signal, chrominance signal, and sound signal; means for modifying the level of the three modulated carrier-waves according to respectively three different given laws with respect to the distance between said recording head ans said centre; means for adding the three level-modified modulated carrier-waves, and delivering a recording signal to said recording head.
Claim 5
Independent Claim
110 words
An apparatus for optically recording on a video-disc a television signal comprising a luminance signal, a chrominance signal, and a sound signal, which apparatus comprises: means for rotating said video-disc around its centre; means for moving a recording head along a radius of said video-disc towards said centre; means for modulating the three carrier-waves with respectively said luminance signal, chrominance signal, and sound signal; means for modifying the level of the three modulated carrier-waves according to respectively three different given laws with respect to the distance between said recording head ans said centre; means for adding the three level-modified modulated carrier-waves, and delivering a recording signal to said recording head.
Claim 6
Dependent Claim
52 words
An apparatus as claimed in claim 3, wherein said modifying means comprise three potentiometers receiving respectively said three modulated carrier-waves, and delivering onto respectively three slides said level-modified modulated carrier waves; said three slides being mechanicaly connected to said recording head for moving in accordance with the motion of the recording head.
Claim 7
Dependent Claim
85 words
An apparatus as claimed in claim 3, wherein said modifying means comprise three potentiometers connected to a fixed voltage source for delivering onto respectively three slides respectively three variable voltages; said three slides being mechanicaly connected to said recording head for mvoing in accordance with the motion of the recording head; said three variables voltages being applied to respectively three variable-gain amplifiers for controlling the amplification of said amplifiers; and said amplifiers receiving respectively said three modulated carrier-waves and delivering respectively said level-modified modulated carrier-waves.
Claim 8
Dependent Claim
99 words
An apparatus as claimed in claim 3, wherein said modifying means comprise a potentiometer connected to a fixed voltage source for delivering a linearly variable voltage onto a slide mechanicaly connected to said recording head for moving in accordance with the motion of the recording head; said linearly variable voltage being applied to simultaneously three function generators for delivering respectively three function-variable voltages; said three function-variable voltages being applied to respectively three variable gain amplifiers for controlling the amplification of said amplifiers; and said amplifiers receiving respectively said three modulated carrier waves and delivering respectively said level-modified modulated carrier-waves.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-10-01 | 1983-04-02 | 1983-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-01 | 1987-04-02 | 1987-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-01 | 1991-04-02 | 1991-10-02 | $7700.00 | Window Closed / Lapsed |