US3605090A
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Decoder for convolutional self-orthogonal error-correcting codes
Assignee: AT&T Inc
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Filing: 1969-04-16
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Granted: 1971-09-14
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Expires: 1989-04-16
Abstract
Abstract An error-correcting decoder for convolutional self-orthogonal codes includes a multistage syndrome register. A majority logic circuit is connected to selected stages of the register. If, during the decoding process, the logic circuit senses that a majority of the selected stages contain ''''1'''' signals, the circuit generates a correction signal that is utilized to invert the information digit currently being processed. Circuitry is provided responsive to such a correction signal for resetting to ''''0'''' all the selected stages of the syndrome register. In this way the undesirable error propagation characteristic of a conventional feedback decoder is significantly improved.
Inventors
- 👤 Herbert O Burton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:31
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/004; H04L1/0056; H04L1/0059
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
4 words
What is claimed is:
Claim 2
Dependent Claim
46 words
A combination as in claim 1 wherein said majority logic circuit includes an output terminal, wherein each of said syndrome register stages includes a reset terminal, and wherein said resetting means comprises a delay unit connected between said output terminal and each of said reset terminals.
Claim 3
Dependent Claim
110 words
In combination in a decoder for convolutional self-orthogonal codes, a multistage syndrome register for storing a pattern of digits representative of the error status of received information digits, means for shifting said pattern through said register in a digit-by-digit manner, logic means connected to a selected plurality of the stages of said register for generating a ''''1'''' correction signal if a majority of said selected stages store ''''1'''' representations therein, and resetting means responsive to said ''''1'''' correction signal for clearing to ''''0'''' each of said selected stages that stores a ''''1'''' representation and for maintaining in its ''''0'''' state each of said selected stages that stores a ''''0'''' representation.
Claim 4
Dependent Claim
110 words
In combination in a decoder for convolutional self-orthogonal codes, a multistage syndrome register for storing a pattern of digits representative of the error status of received information digits, means for shifting said pattern through said register in a digit-by-digit manner, logic means connected to a selected plurality of the stages of said register for generating a ''''1'''' correction signal if a majority of said selected stages store ''''1'''' representations therein, and resetting means responsive to said ''''1'''' correction signal for clearing to ''''0'''' each of said selected stages that stores a ''''1'''' representation and for maintaining in its ''''0'''' state each of said selected stages that stores a ''''0'''' representation.
Claim 5
Dependent Claim
40 words
A combination as in claim 3 wherein said resetting means includes means for preventing a race condition in said decoder while at the same time ensuring that resetting of said selected stages takes place before said register is next shifted.
Claim 6
Dependent Claim
48 words
A combination as in claim 4 wherein said register comprises seven stages, the selected stages of which are the first, third, sixth and seventh stages thereof, wherein said resetting means is connected to the third, sixth and seventh stages, and wherein said preventing means comprises a delay unit.
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) | 1974-09-13 | 1975-03-15 | 1975-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-13 | 1979-03-15 | 1979-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-13 | 1983-03-15 | 1983-09-14 | $7700.00 | Window Closed / Lapsed |