US4323916A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Data rate reduction for digital video signals by subsampling and adaptive reconstruction
Assignee: RCA Corp
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Filing: 1980-07-14
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Granted: 1982-04-06
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Expires: 2000-07-14
Abstract
Abstract A digital TV system reduces the data rate by transmitting or recording only bytes representing half of the sampled pixels. Steering bits are also transmitted that tell which of the transmitted bytes are the closest match to the untransmitted bytes so the pixels represented by the later can be reconstructed.
Inventors
- 👤 Robert A. Dischert
- 👤 Glenn A. Reitmeier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:39
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/50; H04N19/587; H04N19/59
Claims Analysis
Total Claims: 37
Claim 1
Independent Claim
82 words
A method of transmitting data divided into first and second portions, each portion comprising a plurality of bytes, said method comprising transmitting said first portion, comparing at least one byte of the remaining untransmitted second portion to a plurality of selected combinations of bytes of said first portion, determining which of said selected combinations of bytes of said first portion is the closest match to said one byte of said second portion, and transmitting a control byte indicative of said closest match.
Claim 2
Independent Claim
82 words
A method of transmitting data divided into first and second portions, each portion comprising a plurality of bytes, said method comprising transmitting said first portion, comparing at least one byte of the remaining untransmitted second portion to a plurality of selected combinations of bytes of said first portion, determining which of said selected combinations of bytes of said first portion is the closest match to said one byte of said second portion, and transmitting a control byte indicative of said closest match.
Claim 3
Dependent Claim
64 words
A method as claimed in claim 1 wherein said bytes represent samples of a video signal, said first portion represents alternately occurring samples of scanning lines, said first portion samples of adjacent lines being horizontally staggered with respect to each other, and said comparing step comprises comparing second portion samples to first portion samples that are immediately adjacent to the respective second portion sample.
Claim 4
Dependent Claim
41 words
A method as claimed in claim 2 wherein said combinations comprise the average of samples representing points immediately above and below said one byte and the average of samples representing points immediately to the left and right of said one byte.
Claim 5
Dependent Claim
23 words
A method as claimed in claim 1 wherein each of said data bytes comprises eight bits and said control byte comprises two bits.
Claim 6
Independent Claim
86 words
A method for receiving transmitted data, said transmitted data comprising a first transmitted portion of control bytes indicative of which of selected combinations of bytes of said first portion is a closest match to respective bytes of an untransmitted second portion, said method comprising extracting said control bytes from said transmitted data, extracting said selected combinations from said transmitted data, applying to an output said bytes that are the closest match in accordance with said control bytes, and alternately applying to said output said first portion.
Claim 7
Independent Claim
86 words
A method for receiving transmitted data, said transmitted data comprising a first transmitted portion of control bytes indicative of which of selected combinations of bytes of said first portion is a closest match to respective bytes of an untransmitted second portion, said method comprising extracting said control bytes from said transmitted data, extracting said selected combinations from said transmitted data, applying to an output said bytes that are the closest match in accordance with said control bytes, and alternately applying to said output said first portion.
Claim 8
Independent Claim
89 words
A device for transmitting data divided into first and second portions, each portion comprising a plurality of bytes, said device comprising means for transmitting said first portion, means for providing selected combinations of bytes of said first portion, means for comparing at least one byte of the second portion to said selected combinations, means for determining which of said selected combinations is the closest match to said one byte and for generating a control byte indicative of said closest match, said control byte being applied to said transmitting means.
Claim 9
Independent Claim
89 words
A device for transmitting data divided into first and second portions, each portion comprising a plurality of bytes, said device comprising means for transmitting said first portion, means for providing selected combinations of bytes of said first portion, means for comparing at least one byte of the second portion to said selected combinations, means for determining which of said selected combinations is the closest match to said one byte and for generating a control byte indicative of said closest match, said control byte being applied to said transmitting means.
Claim 10
Dependent Claim
64 words
A device as claimed in claim 6 wherein said bytes represent samples of a video signal, said first portion represents alternately occurring samples of scanning lines, said first portion samples of adjacent lines being horizontally staggered with respect to each other, and said comparing step comprises comparing second portion samples to first portion samples that are immediately adjacent to the respective second portion sample.
Claim 11
Dependent Claim
41 words
A device as claimed in claim 7 wherein said combinations comprise the average of samples representing points immediately above and below said one byte and the average of samples representing points immediately to the left and right of said one byte.
Claim 12
Dependent Claim
15 words
A device as claimed in claim 6 wherein said providing means comprises a filter bank.
Claim 13
Dependent Claim
16 words
A device as claimed in claim 6 wherein said comparing means comprises a plurality of comparators.
Claim 14
Dependent Claim
17 words
A device as claimed in claim 6 wherein said determining means comprises a minimum error logic circuit.
Claim 15
Independent Claim
94 words
A device for receiving transmitted data, said transmitted data comprising a first transmitted portion and control bytes indicative of which of selected combinations of bytes of said first portion is a closest match to respective bytes of an untransmitted second portion, said device comprising means for decoding said control bytes from said transmitted data, means for extracting said selected combinations from said transmitted data, an output, means for applying to said output said bytes that are the closest match in accordance with said control bytes, and alternately applying to said output said first portion.
Claim 16
Independent Claim
94 words
A device for receiving transmitted data, said transmitted data comprising a first transmitted portion and control bytes indicative of which of selected combinations of bytes of said first portion is a closest match to respective bytes of an untransmitted second portion, said device comprising means for decoding said control bytes from said transmitted data, means for extracting said selected combinations from said transmitted data, an output, means for applying to said output said bytes that are the closest match in accordance with said control bytes, and alternately applying to said output said first portion.
Claim 17
Dependent Claim
15 words
A device as claimed in claim 12 wherein said extracting means comprises a filter bank.
Claim 18
Independent Claim
39 words
A method of transmitting signals comprising first and predetermined second time portions, said method comprising transmitting said first portion, and transmitting a distinct control signal adapted to control the reconstruction of said second portion from the transmitted first portion.
Claim 19
Independent Claim
39 words
A method of transmitting signals comprising first and predetermined second time portions, said method comprising transmitting said first portion, and transmitting a distinct control signal adapted to control the reconstruction of said second portion from the transmitted first portion.
Claim 20
Dependent Claim
16 words
A method as claimed in claim 14, wherein said first and second portions comprise video signals.
Claim 21
Dependent Claim
15 words
A method as claimed in claim 14 wherein all of said signals comprise digital signals.
Claim 22
Dependent Claim
33 words
A method as claimed in claim 14 wherein said first portion comprises a plurality of samples and said control signal indicates which of said samples is the closest match to said second portion.
Claim 23
Independent Claim
48 words
A method for receiving a signal having a transmitted first predetermined time portion, an untransmitted second predetermined time portion, and a distinct transmitted control portion, said method comprising receiving said first and control portions, and reconstructing said second portion from said first portion by using said control portion.
Claim 24
Independent Claim
48 words
A method for receiving a signal having a transmitted first predetermined time portion, an untransmitted second predetermined time portion, and a distinct transmitted control portion, said method comprising receiving said first and control portions, and reconstructing said second portion from said first portion by using said control portion.
Claim 25
Dependent Claim
16 words
A method as claimed in claim 18 wherein said first and second portions comprise video signals.
Claim 26
Dependent Claim
14 words
A method as claimed in claim 18 wherein said signal comprises a digital signal.
Claim 27
Dependent Claim
33 words
A method as claimed in claim 18 wherein said first portion comprises a plurality of samples, and said control portion indicates which of said samples is the closest match to said second portion.
Claim 28
Independent Claim
43 words
An apparatus for transmitting signals comprising first and second predetermined time portions, said apparatus comprising means for transmitting said first portion, and means for transmitting a distinct control signal adapted to control the reconstruction of said second portion from the transmitted first portion.
Claim 29
Independent Claim
43 words
An apparatus for transmitting signals comprising first and second predetermined time portions, said apparatus comprising means for transmitting said first portion, and means for transmitting a distinct control signal adapted to control the reconstruction of said second portion from the transmitted first portion.
Claim 30
Dependent Claim
16 words
An apparatus as claimed in claim 22 wherein said first and second portions comprise video signals.
Claim 31
Dependent Claim
15 words
An apparatus as claimed in claim 22 wherein all of said signals comprise digital signals.
Claim 32
Dependent Claim
33 words
An apparatus as claimed in claim 22 wherein said first portion comprises a plurality of samples and said control signal indicates which of said samples is the closest match to said second portion.
Claim 33
Independent Claim
49 words
An apparatus for receiving a signal having a transmitted first predetermined portion, an untransmitted second predetermined portion and a distinct transmitted control portion, said apparatus comprising means for receiving said first and control portions, and means for reconstructing said second portion from said first portion using said control portion.
Claim 34
Independent Claim
49 words
An apparatus for receiving a signal having a transmitted first predetermined portion, an untransmitted second predetermined portion and a distinct transmitted control portion, said apparatus comprising means for receiving said first and control portions, and means for reconstructing said second portion from said first portion using said control portion.
Claim 35
Dependent Claim
16 words
An apparatus as claimed in claim 26 wherein said first and second portions comprise video signals.
Claim 36
Dependent Claim
14 words
An apparatus as claimed in claim 26 wherein said signal comprises a digital signal.
Claim 37
Dependent Claim
33 words
An apparatus as claimed in claim 26 wherein said first portion comprises a plurality of samples, and said control portion indicates which of said samples is the closest match to said second portion.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-04-05 | 1985-10-05 | 1986-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-05 | 1989-10-05 | 1990-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-05 | 1993-10-05 | 1994-04-06 | $7700.00 | Window Closed / Lapsed |