US4567508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-channel compatible television transmission system for wide picture formats
Assignee: US Philips Corp
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Filing: 1983-11-16
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Granted: 1986-01-28
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Expires: 2003-11-16
Abstract
Abstract A television transmission system for the simultaneous transmission of television signals, depicting the same scene, for standard and wide picture formats of, respectively, a standard aspect ratio and a wider than standard aspect ratio. The television signal (FIG. 2) for the scene having 1249 lines per field is divided to produce a first television signal (FIG. 4) of 625 lines per field representing the wide picture format where adjacent lines of a field are derived from alternate lines of the scene television signal and a second television signal (FIG. 3) also of 625 lines per field representing the standard picture format where adjacent lines of a field are derived from the intervening lines of the scene television signal. The first and second television signals may be received together for the provision of a wide screen television display and the invention has the advantage that the second television signal may be received alone by currently manufactured television receivers for reproduction of a display of standard aspect ratio.
Inventors
- 👤 Michael G. Hulyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:02
CPC Classifications
H; H04; H04N; H04N11/00; H04N11/24; H04N11/26
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
305 words
A method for simultaneously transmitting television signals depicting the same scene, for standard and wide picture formats of, respectively, a standard aspect ratio and a wider than standard aspect ratio, in which both picture formats have the same height, said method comprising the steps: converting a wide-band television signal, which represents the full width of the wide picture format and has n lines per picture, into a first narrower-band television signal, which also represents the full width of the wide picture format and has m lines per picture, where m is substantially 1/2n and both said wide-band and said first narrower-band television signals have the same field and picture rates, in which said conversion comprises deriving respective adjacent lines of a field of said first narrower-band television signal from respective alternate lines in a field of said wide-band television signal, characterized in that said method further comprises converting said wide-band television signal into a second narrower-band television signal representing the width of the standard picture format and having the same number of lines and the field and picture rates as said first narrower-band television signal, in which said conversion comprises deriving respective adjacent lines of a corresponding field of said second narrower-band television signal from the respective intervening lines of the field of said wide-band television signal, and transmitting said first and second narrower-band television signals by way of respective first and second transmission paths, wherein the transmissions from said first and second transmission paths may be received together and a wide-band television signal having n lines per picture reconstituted from said first and second narrower-band television signals for reproduction as a wide picture format television display or the transmission from the second transmission path may be received alone for reproduction as a television display of standard picture format and normal quality as herein defined.
Claim 2
Independent Claim
305 words
A method for simultaneously transmitting television signals depicting the same scene, for standard and wide picture formats of, respectively, a standard aspect ratio and a wider than standard aspect ratio, in which both picture formats have the same height, said method comprising the steps: converting a wide-band television signal, which represents the full width of the wide picture format and has n lines per picture, into a first narrower-band television signal, which also represents the full width of the wide picture format and has m lines per picture, where m is substantially 1/2n and both said wide-band and said first narrower-band television signals have the same field and picture rates, in which said conversion comprises deriving respective adjacent lines of a field of said first narrower-band television signal from respective alternate lines in a field of said wide-band television signal, characterized in that said method further comprises converting said wide-band television signal into a second narrower-band television signal representing the width of the standard picture format and having the same number of lines and the field and picture rates as said first narrower-band television signal, in which said conversion comprises deriving respective adjacent lines of a corresponding field of said second narrower-band television signal from the respective intervening lines of the field of said wide-band television signal, and transmitting said first and second narrower-band television signals by way of respective first and second transmission paths, wherein the transmissions from said first and second transmission paths may be received together and a wide-band television signal having n lines per picture reconstituted from said first and second narrower-band television signals for reproduction as a wide picture format television display or the transmission from the second transmission path may be received alone for reproduction as a television display of standard picture format and normal quality as herein defined.
Claim 3
Dependent Claim
69 words
A method for transmitting television signals as claimed in claim 1, in which said first and second narrower-band television signals are color television signals and the transmissions by way of said first and second transmission paths contain periodic bursts at the frequency of a color subcarrier, characterized in that on reception, the color subcarrier bursts in the first transmission path are employed to synchronize said first narrower-band television signal.
Claim 4
Dependent Claim
47 words
A method of transmitting television signals as claimed in claim 1 or 2, characterized in that said first narrower-band television signal contains a steering signal during a blanking interval thereof for controlling the reconstruction of said wide-band television signal from said first and second narrower-band television signals.
Claim 5
Dependent Claim
35 words
A method of transmitting television signals as claimed in claim 1 or 2, characterized in that said first and second transmission paths comprise respective first and second radio frequency television channels having different carrier frequencies.
Claim 6
Dependent Claim
38 words
A method of transmitting television signals as claimed in claim 1 or 2, characterized in that said first and second transmission paths comprise the respective lower and upper or upper and lower sidebands of a radio frequency transmission.
Claim 7
Dependent Claim
30 words
A method of transmitting television signals as claimed in claim 1 or 2, characterized in that said first and second transmission paths are the record/reproduce channels of video recorder apparatus.
Claim 8
Dependent Claim
60 words
A method of transmitting television signals as claimed in claim 2, in which said first and second transmission paths are the record/reproduce channels of separate video tape recorders, characterized in that said recorders are controlled to ensure synchronization therebetween by the periodic bursts at the frequency of said color subcarrier in the transmission of said first and second transmission paths.
Claim 9
Dependent Claim
213 words
Television transmission equipment for simultaneously transmitting television signals depicting the same scene, for standard and wide picture formats of, respectively, a standard aspect ratio and a wider than standard aspect ratio, in which both picture formats have the same height, said transmission equipment comprising means for providing a wide-band television signal having n lines per picture representing the full width of the wide picture format, means for producing from said wide-band television signal, a first narrower-band converted television signal of m lines per picture, where m is substantially 1/2n, and having the same field and picture rates and representing the full width of the wide picture format as said wide-band television signal, said first converted television signal having respective adjacent lines of a field derived from respective alternate lines of a field of said wide-band television signal, characterized in that said equipment additionally comprises means for simultaneously producing from said wide-band television signal, a second narrower-band converted television signal having the same number of lines and the same field and picture rates as said first converted television signal, said second converted television signal representing the reduced width of the standard picture format and having respective adjacent lines of a field derived from respective intervening lines of a field of said wide-band television signal.
Claim 10
Dependent Claim
213 words
Television transmission equipment for simultaneously transmitting television signals depicting the same scene, for standard and wide picture formats of, respectively, a standard aspect ratio and a wider than standard aspect ratio, in which both picture formats have the same height, said transmission equipment comprising means for providing a wide-band television signal having n lines per picture representing the full width of the wide picture format, means for producing from said wide-band television signal, a first narrower-band converted television signal of m lines per picture, where m is substantially 1/2n, and having the same field and picture rates and representing the full width of the wide picture format as said wide-band television signal, said first converted television signal having respective adjacent lines of a field derived from respective alternate lines of a field of said wide-band television signal, characterized in that said equipment additionally comprises means for simultaneously producing from said wide-band television signal, a second narrower-band converted television signal having the same number of lines and the same field and picture rates as said first converted television signal, said second converted television signal representing the reduced width of the standard picture format and having respective adjacent lines of a field derived from respective intervening lines of a field of said wide-band television signal.
Claim 11
Dependent Claim
87 words
Television transmission equipment as claimed in claim 8, in which a raster conversion arrangement is provided for receiving said wide-band television signal and for producing therefrom said first converted television signal expanded in time to occupy substantially twice the period per line as that of said wide-band television signal, characterized in that said raster conversion arrangement also produces from said wide-band television signal said second converted television signal also expanded in time to occupy substantially twice the period per line as that of said wide-band television signal.
Claim 12
Dependent Claim
34 words
Television transmission equipment as claimed in claim 9, characterized in that the period per line occupied by picture information is greater in said first converted television signal than in said second converted television signal.
Claim 13
Dependent Claim
49 words
Television transmission equipment as claimed in claim 8, 9 or 10, which equipment is for the transmission of color television signals, characterized in that synchronizing bursts at the frequency of a color subcarrier are included in said first and second converted television signals and have a given phase relationship.
Claim 14
Dependent Claim
275 words
Television reception equipment for simultaneously receiving television signals depicting the same scene, for standard and wide picture formats of, respectively, a standard aspect ratio and a wider than standard aspect ratio, in which both picture formats have the same height, said reception equipment, comprising a first input for receiving a first of said television signals having m lines per picture, means for time compressing said first television signal for producing a first compressed television signal having m lines per picture and the same field and picture rates as said first television signal, said first compressed television signal containing picture information in alternate of its lines which information represents the full width of the wide picture format, characterized in that said reception equipment additionally comprises a second input for receiving a second of said television signals also having m lines per picture, means for time compressing said second television signal for producing a second compressed television signal having the same number of lines and the same field and picture rates as said first compressed television signal, said second compressed television signal containing picture information in alternate of its lines which information represents the reduced width of said standard picture format, means for adding to said second compressed television signal, picture information from said first compressed television signal which represents those portions which lie outside the width of said standard format to produce a modified second compressed television signal, and means for combining said first compressed television signal and said modified second compressed television signal to produce a wide-band television signal having picture information in each line which represents the full width of said wide picture format.
Claim 15
Dependent Claim
275 words
Television reception equipment for simultaneously receiving television signals depicting the same scene, for standard and wide picture formats of, respectively, a standard aspect ratio and a wider than standard aspect ratio, in which both picture formats have the same height, said reception equipment, comprising a first input for receiving a first of said television signals having m lines per picture, means for time compressing said first television signal for producing a first compressed television signal having m lines per picture and the same field and picture rates as said first television signal, said first compressed television signal containing picture information in alternate of its lines which information represents the full width of the wide picture format, characterized in that said reception equipment additionally comprises a second input for receiving a second of said television signals also having m lines per picture, means for time compressing said second television signal for producing a second compressed television signal having the same number of lines and the same field and picture rates as said first compressed television signal, said second compressed television signal containing picture information in alternate of its lines which information represents the reduced width of said standard picture format, means for adding to said second compressed television signal, picture information from said first compressed television signal which represents those portions which lie outside the width of said standard format to produce a modified second compressed television signal, and means for combining said first compressed television signal and said modified second compressed television signal to produce a wide-band television signal having picture information in each line which represents the full width of said wide picture format.
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) | 1989-01-27 | 1989-07-29 | 1990-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-27 | 1993-07-29 | 1994-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-27 | 1997-07-29 | 1998-01-28 | $7700.00 | Window Closed / Lapsed |