US4181816A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Devices for combining random sequences, using one or more switching operations
Assignee: Thales SA
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Filing: 1969-04-03
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Granted: 1980-01-01
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Expires: 1989-04-03
Abstract
Abstract In a circuit for producing pseudo-random sequences of digits, using at least one switch to the inputs of which sequences of digits are applied, the control signals determining the connections established by the switch between its inputs and its outputs, are made a function of signals previously supplied by at least one of the outputs of the switch.
Inventors
- 👤 Jean-Pierre Vasseur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:30
CPC Classifications
H; H04; H04L; H04L9/00; H04L9/06; H04L9/065; H04L9/0656; H04L9/0662
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
136 words
A device comprising: at least one switch having N signal inputs, C control inputs, and N' outputs for respectively delivering thereto N' pseudo-random sequences of digits, N, C and N' being positive integers and N being greater than 1; means for respectively applying to said N signal inputs the successive digits of N sequences respectively associated with said N signal inputs; and a control system, having C outputs respectively connected to said C control inputs, for respectively delivering thereto C control signals for each group of N digits simultaneously applied to said N signal inputs, said control system having at least one input connected to one of said N' outputs for receiving therefrom successive input digits, and including delaying means for delaying the action of said input digits of said control system on said control signals.
Claim 2
Independent Claim
136 words
A device comprising: at least one switch having N signal inputs, C control inputs, and N' outputs for respectively delivering thereto N' pseudo-random sequences of digits, N, C and N' being positive integers and N being greater than 1; means for respectively applying to said N signal inputs the successive digits of N sequences respectively associated with said N signal inputs; and a control system, having C outputs respectively connected to said C control inputs, for respectively delivering thereto C control signals for each group of N digits simultaneously applied to said N signal inputs, said control system having at least one input connected to one of said N' outputs for receiving therefrom successive input digits, and including delaying means for delaying the action of said input digits of said control system on said control signals.
Claim 3
Dependent Claim
196 words
A device as claimed in claim 1, for operation with binary digits, said device comprising p switches S i , p being an integer, and i=1,2, . . . p, each switch S i having N i inputs, N' i outputs for respectively delivering thereto N' i pseudo-random sequences of digits and C i control inputs, the N i , C i and N' i being integers and each integer N i being greater than 1; said control system comprising a complex converter comprising modulo 2 adders, each of said adders having inputs, the number of said modulo 2 adders being at least equal to the total number q of said outputs of said p switches, and respective inputs of q of said adders being respectively connected to said outputs of said switches, said complex converter comprising at least one main output for delivering thereto a further pseudo-random sequence of digits, and auxiliary outputs; said control system further comprising a plurality of decoders, each decoder having a plurality of inputs respectively fed by a plurality of said auxiliary outputs, and a plurality of outputs respectively coupled to a plurality of said control inputs of said switches.
Claim 4
Dependent Claim
13 words
A device as claimed in claim 1, wherein N' is greater than 2.
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) | 1982-12-31 | 1983-07-02 | 1984-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-31 | 1987-07-02 | 1988-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-31 | 1991-07-02 | 1992-01-01 | $7700.00 | Window Closed / Lapsed |