US3576952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Forward error correcting code telecommunicating system
Assignee: Government of Netherlands
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Filing: 1969-01-06
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Granted: 1971-05-04
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Expires: 1989-01-06
Abstract
Abstract A multielement code telecommunication system comprising first converting each code signal into a constant ratio 1-bit/0-bit signal, storing a predetermined successive number of such converted code signals in shift registers to form a group, and forming a test signal by modulo 2 adding the bits in said group of signals which test signal is transmitted with and after each said group to form a block of signals; receiving and storing in shift registers each signal in said group, testing each signal as it is received and if one and only one signal in said group is found mutilated or erroneous, clearing the shift register in which that erroneous signal is stored and reconstructing therein the correct signal from said test signal and the other correctly received signals in that group; and lastly reconverting said correct group of signals and transferring them from printing registers successively to a printer.
Inventors
- 👤 Hendrik Cornelis Anthon Duuren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:10
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/004; H04L1/0041; H04L1/0045; H04L1/0056; H04L1/0061; H04L1/0063; H04L1/12; H04L1/16; H04L1/18; H04L1/1829
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
217 words
A telecommunication system for blocks of multielement code signals having a transmitter and a receiver for said signals, said transmitter comprising: A. means to convert said signals into constant/ratio code signals, B. means connected to said converter means for storing a group of successive converted code signals in a first shift register, C. a modulo 2 adder means connected to said storing means for forming a test signal by successively adding the last elements of said plurality of successively stored code signals in said group, and D. means connected to said storing means for transmitting said group of code signals followed by said test signal to form a block; and said receiver comprising: E. means connected to said receiving means for successively testing each code signal in said group for errors, F. means connected to said receiving means for storing said code signals in a second shift register, and G. separate modulo 2 adder means for each code signal in said group and connected to said receiving means and to the latter storing means for each said code signal for reconstructing one erroneously detected signal in said second shift register from the other and correctly received code signals and said test signal in said block by successively adding the elements of said other code and test signals.
Claim 2
Dependent Claim
217 words
A telecommunication system for blocks of multielement code signals having a transmitter and a receiver for said signals, said transmitter comprising: A. means to convert said signals into constant/ratio code signals, B. means connected to said converter means for storing a group of successive converted code signals in a first shift register, C. a modulo 2 adder means connected to said storing means for forming a test signal by successively adding the last elements of said plurality of successively stored code signals in said group, and D. means connected to said storing means for transmitting said group of code signals followed by said test signal to form a block; and said receiver comprising: E. means connected to said receiving means for successively testing each code signal in said group for errors, F. means connected to said receiving means for storing said code signals in a second shift register, and G. separate modulo 2 adder means for each code signal in said group and connected to said receiving means and to the latter storing means for each said code signal for reconstructing one erroneously detected signal in said second shift register from the other and correctly received code signals and said test signal in said block by successively adding the elements of said other code and test signals.
Claim 3
Dependent Claim
23 words
A system according to claim 1 including a tape reader at said transmitter for introducing said multielement code signals to said converter means.
Claim 4
Dependent Claim
34 words
A system according to claim 1 wherein said modUlo 2 adder means are connected to the outputs of said shift registers corresponding to each code signal of said group of code signals stored therein.
Claim 5
Dependent Claim
33 words
A system according to claim 1 wherein said test signal forming means in said transmitter comprises means for cancelling each added signal from said first shift register except that for said test signal.
Claim 6
Dependent Claim
13 words
A system according to claim 1 wherein said transmitting means includes a keyer.
Claim 7
Dependent Claim
28 words
A system according to claim 1 wherein said transmitter includes means for applying a plurality of timed pulses for controlling said means A through D of said transmitter.
Claim 8
Dependent Claim
53 words
A system according to claim 1 wherein said elements of said signals comprise b 1-bits and 0-bits and said means for reconstructing one erroneously detected code signal in said receiver comprises means for converting the elements of that erroneously detected code signal to 0-bits in its corresponding portion of said second shift register.
Claim 9
Dependent Claim
25 words
A system according to claim 1 wherein said receiver includes a distributor for producing pulses for controlling said means E through H in said receiver.
Claim 10
Dependent Claim
23 words
A system according to claim 1 including a code converter connected to said storing means in said receiver for converting said code signals.
Claim 11
Dependent Claim
21 words
A system according to claim 9 including another register means in said receiver for said converted code signals in said group.
Claim 12
Dependent Claim
24 words
A system according to claim 10 including a printer means connected to said other register means for the correct code signals in said group.
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) | 1974-05-03 | 1974-11-02 | 1975-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-03 | 1978-11-02 | 1979-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-03 | 1982-11-02 | 1983-05-04 | $7700.00 | Window Closed / Lapsed |