US4025950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sampling video compression system
Assignee: National Aeronautics and Space Administration
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Filing: 1976-05-27
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Granted: 1977-05-24
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Expires: 1996-05-27
Abstract
Abstract A picture transmission system for transmitting a video signal of compressed bandwidth in which the transmitting station is provided with circuitry for dividing a picture to be transmitted into a plurality of blocks containing a checkerboard pattern of picture elements and regularly sampling video signals along corresponding diagonal rows of picture elements in the respective blocks, and a transmitter responsive to the output of the sampling circuitry for transmitting the sampled video signals of one frame at a reduced bandwidth over a communication channel; and in which the receiving station is provided with a frame memory for temporarily storing transmitted video signals of one frame, and circuitry for playing back the video signals of one frame at the original high bandwidth frequency.
Inventors
- 👤 Yutaka Matsumoto
- 👤 Henry Lum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:03
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/12; H04N7/122; H04N7/125
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
140 words
A picture transmission system for transmitting a video signal of compressed bandwidth over a communications channel and for receiving and processing the transmitted video signal, said picture transmission system comprising: a transmitting station including: sampling means for dividing a picture frame into a plurality of blocks containing a checkerboard pattern of picture elements and regularly sampling video signals along corresponding diagonal rows of picture elements in the respective blocks; means responsive to the output of said sampling means for transmitting the sampled video signals of one picture frame at a reduced bandwidth over a communications channel; a receiving station including: a frame memory for temporarily storing transmitted video signals of one picture frame; and play-back means responsive to the output of said frame memory for playing back the video signals of one picture frame at the original high bandwidth frequency.
Claim 2
Dependent Claim
140 words
A picture transmission system for transmitting a video signal of compressed bandwidth over a communications channel and for receiving and processing the transmitted video signal, said picture transmission system comprising: a transmitting station including: sampling means for dividing a picture frame into a plurality of blocks containing a checkerboard pattern of picture elements and regularly sampling video signals along corresponding diagonal rows of picture elements in the respective blocks; means responsive to the output of said sampling means for transmitting the sampled video signals of one picture frame at a reduced bandwidth over a communications channel; a receiving station including: a frame memory for temporarily storing transmitted video signals of one picture frame; and play-back means responsive to the output of said frame memory for playing back the video signals of one picture frame at the original high bandwidth frequency.
Claim 3
Dependent Claim
24 words
The picture transmission system recited in claim 1 wherein said sampling means includes an analog-to-digital converter, and said playback means includes a digital-to-analog converter.
Claim 4
Dependent Claim
15 words
The picture transmission system recited in claim 1 wherein said transmitting means includes a modem.
Claim 5
Dependent Claim
23 words
The picture transmission system recited in claim 1 wherein said frame memory includes a plurality of groups of simultaneously controllable re-circulating shift registers.
Claim 6
Dependent Claim
160 words
A picture transmission system for transmitting a video signal of compressed bandwidth over a communications channel and for receiving and processing the transmitted video signal, said picture transmission system comprising: a transmitting station including: sampling means for dividing a picture frame into a plurality of blocks containing a checkerboard pattern of N times N picture elements where N is an integer determined in accordance with the temporal compression ratio N:1 to be achieved, and regularly sampling video signals along corresponding diagonal rows of picture elements in the respective blocks; means responsive to the output of said sampling means for transmitting the sampled video signals of one picture frame at a reduced bandwidth over a communications channel; a receiving station including: a frame memory for temporarily storing transmitted video signals of one picture frame; and play-back means responsive to the output of said frame memory for playing back the video signals of one picture frame at the original high bandwidth frequency.
Claim 7
Dependent Claim
160 words
A picture transmission system for transmitting a video signal of compressed bandwidth over a communications channel and for receiving and processing the transmitted video signal, said picture transmission system comprising: a transmitting station including: sampling means for dividing a picture frame into a plurality of blocks containing a checkerboard pattern of N times N picture elements where N is an integer determined in accordance with the temporal compression ratio N:1 to be achieved, and regularly sampling video signals along corresponding diagonal rows of picture elements in the respective blocks; means responsive to the output of said sampling means for transmitting the sampled video signals of one picture frame at a reduced bandwidth over a communications channel; a receiving station including: a frame memory for temporarily storing transmitted video signals of one picture frame; and play-back means responsive to the output of said frame memory for playing back the video signals of one picture frame at the original high bandwidth frequency.
Claim 8
Dependent Claim
12 words
The picture transmission system recited in claim 5 wherein N is 16.
Claim 9
Dependent Claim
12 words
The picture transmission system recited in claim 5 wherein N is 8.
Claim 10
Dependent Claim
12 words
The picture transmission system recited in claim 5 wherein N is 4.
Claim 11
Independent Claim
108 words
The method of transmitting a video signal of compressed bandwidth over a communications channel and receiving and processing the transmitted signal, comprising: dividing a picture frame into a plurality of blocks containing a checkerboard pattern of picture elements; sampling video signals along corresponding diagonal rows of picture elements in the respective blocks; transmitting the sampled video signals of one picture frame at a reduced bandwidth over a communications channel; receiving the transmitted video signals of one picture frame from the communications channel; storing temporarily the transmitted video signals of one picture frame; and playing back the video signals of one picture frame at the original high bandwidth frequency.
Claim 12
Independent Claim
108 words
The method of transmitting a video signal of compressed bandwidth over a communications channel and receiving and processing the transmitted signal, comprising: dividing a picture frame into a plurality of blocks containing a checkerboard pattern of picture elements; sampling video signals along corresponding diagonal rows of picture elements in the respective blocks; transmitting the sampled video signals of one picture frame at a reduced bandwidth over a communications channel; receiving the transmitted video signals of one picture frame from the communications channel; storing temporarily the transmitted video signals of one picture frame; and playing back the video signals of one picture frame at the original high bandwidth frequency.
References Cited (Backward Citations)
US3769452A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-23 | 1980-11-22 | 1981-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-23 | 1984-11-22 | 1985-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-23 | 1988-11-22 | 1989-05-24 | $7700.00 | Window Closed / Lapsed |