US3739090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and circuit arrangement for reproduction of a slowly transmitted picture in video telephony
Assignee: Siemens AG
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Filing: 1971-07-06
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Granted: 1973-06-12
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Expires: 1991-07-06
Abstract
Abstract A process and apparatus are described for flicker-free reproduction, e.g., over a narrow band channel, of a slowly transmitted video telephony picture in which received picture signals are stored and repeatedly made visible on a display screen. The picture storage takes place in a storage tube in which, at the reading out of a given picture signal, the memory at this location is erased. For picture reproduction on a display screen each line stored in a storage plate of the storage tube is read out at high speed, and the picture signals, so obtained, are simultaneously portrayed on the display screen of a picture tube and recorded in an intermediate memory. Subsequently, the signals delayed by the intermediate memory are re-recorded at the same location of the previously read-out line. Thereafter, the next and all further stored lines of each picture are successively read out, reproduced, intermediately stored and re-recorded back in the picture storage tube in the same manner.
Inventors
- 👤 W Heberle
- 👤 S Guntersdorfer
- 👤 P Klein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:34
CPC Classifications
H; H04; H04N; H04N3/00; H04N7/00; H04N7/12; H04N7/122; H04N7/14; H04N7/141
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
120 words
A process for flicker-free reproduction of a slowly transmitted video telephony picture in which received picture signals are stored and thereafter repeatedly made visible on a display screen wherein a storage tube is utilized for picture storage, comprising the steps of: reading out, at relatively high speed, for picture reproduction, each scanning line stored in a storage plate of said storage tube, simultaneously portraying on a display screen of a picture tube and recording in an intermediate memory the scanning line picture signal obtained by said reading out step, re-recording said picture signal, delayed by said inteRmediate memory, in the same location as said previously read-out picture signal and successively reading out, reproducing, intermediately storing and re-recording further scanning lines.
Claim 2
Dependent Claim
120 words
A process for flicker-free reproduction of a slowly transmitted video telephony picture in which received picture signals are stored and thereafter repeatedly made visible on a display screen wherein a storage tube is utilized for picture storage, comprising the steps of: reading out, at relatively high speed, for picture reproduction, each scanning line stored in a storage plate of said storage tube, simultaneously portraying on a display screen of a picture tube and recording in an intermediate memory the scanning line picture signal obtained by said reading out step, re-recording said picture signal, delayed by said inteRmediate memory, in the same location as said previously read-out picture signal and successively reading out, reproducing, intermediately storing and re-recording further scanning lines.
Claim 3
Dependent Claim
38 words
The process defined in claim 1 comprising the additional step of: reproducing the picture signals of each scanning line on said display screen in one of the same line and a neighboring intermediate line during said re-recording step.
Claim 4
Dependent Claim
28 words
The process defined in claim 1 wherein only a portion of a given scanning line is stored in said intermediate memory, said intermediate memory being a point memory.
Claim 5
Dependent Claim
130 words
Video reproduction apparatus, comprising: storage tube means having at least one storage plate in which the stored picture signals are erased upon being sampled, a first voltage source of relatively high potential, means connecting said first voltage source to said storage plate during the recording of a picture signal therein, a second voltage source of relatively lower potential, means connecting said second voltage source to said storage plate during the reading of a picture signal therefrom, intermediate memory means to which said storage plate is connected during the reading out of a picture signal, a display screen, mixing means for preparing scanned picture signals for reproduction on said display screen and means connecting said storage plate to said mixing means during reading out of picture signals from said storage plate.
Claim 6
Dependent Claim
130 words
Video reproduction apparatus, comprising: storage tube means having at least one storage plate in which the stored picture signals are erased upon being sampled, a first voltage source of relatively high potential, means connecting said first voltage source to said storage plate during the recording of a picture signal therein, a second voltage source of relatively lower potential, means connecting said second voltage source to said storage plate during the reading of a picture signal therefrom, intermediate memory means to which said storage plate is connected during the reading out of a picture signal, a display screen, mixing means for preparing scanned picture signals for reproduction on said display screen and means connecting said storage plate to said mixing means during reading out of picture signals from said storage plate.
Claim 7
Dependent Claim
24 words
The apparatus defined in claim 4 wherein the output of said intermediate memory is connected to said mixing device and to said storage tube.
Claim 8
Dependent Claim
27 words
The apparatus defined in claim 4 wherein said storage tube is a two beam tube having an input for recording received picture signals on said storage plate.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |