Patent US3852534A successfully refreshed from Google Patents.
US3852534A
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Method and apparatus for synchronizing pseudorandom coded data sequences
Assignee: United States Department of the Army
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Filing: 1973-06-07
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Granted: 1974-12-03
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Expires: 1993-06-07
Abstract
Abstract A simple means is provided for maintaining synchronization between pseudorandom generators at separate locations when a communication channel therebetween is being used on a timeshared, non-continuous basis. The pseudorandom coding device changes its coding state once per data bit. A timing system provides timing pulses to a transmitter-receiver circuit and to a pseudorandom coding unit. The coding unit encodes data to be transmitted and decodes data that has been received. Time correlation is maintained between the coding unit and the timing system by utilizing a common time generating source for timing and for clock pulses to the pseudorandom device.
Inventors
- 👤 T Tilk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:31
CPC Classifications
H; H04; H04J; H04J13/00; H04J3/00; H04J3/02; H04J3/06; H04J3/0602; H04J3/0605; H04J3/0611
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
130 words
A method of maintaining synchronization between pseudorandom generators at separate locations when a communication channel is being used on a time shared, non-continuous basis, comprising the steps of: generating, by individual stations, a periodic time period for transmission or reception of a communications signal during the time period; transmitting message bits a fixed number of bit durations after the leading edge of the time period; coding said message bits with the output from a pseudorandom bit generator; time correlating said coding and said time period with a common time generating source; receiving transmitted messages by a receiver station; delaying the received message until the instant of the trailing edge of the time period; and deciphering the delayed message by combining the message with coding bits from a pseudorandom bit generator.
Claim 2
Independent Claim
130 words
A method of maintaining synchronization between pseudorandom generators at separate locations when a communication channel is being used on a time shared, non-continuous basis, comprising the steps of: generating, by individual stations, a periodic time period for transmission or reception of a communications signal during the time period; transmitting message bits a fixed number of bit durations after the leading edge of the time period; coding said message bits with the output from a pseudorandom bit generator; time correlating said coding and said time period with a common time generating source; receiving transmitted messages by a receiver station; delaying the received message until the instant of the trailing edge of the time period; and deciphering the delayed message by combining the message with coding bits from a pseudorandom bit generator.
Claim 3
Dependent Claim
105 words
a pseudorandom generator for providing an undelayed output to said transmitting combining circuit and a delayed output to said receiving combining circuit; d. a buffer circuit for providing data to and receiving data from said combining circuits; and e. a timing circuit for defining a multibit local time slot, for providing control signals to said buffer to initiate application of data from said buffer to said transmitting combining circuit a predetermined number of bits after the start of said local time slot, for activating said pseudorandom generator, and for providing said control signals to said storage apparatus at the end of said local time slot.
Claim 4
Dependent Claim
105 words
a pseudorandom generator for providing an undelayed output to said transmitting combining circuit and a delayed output to said receiving combining circuit; d. a buffer circuit for providing data to and receiving data from said combining circuits; and e. a timing circuit for defining a multibit local time slot, for providing control signals to said buffer to initiate application of data from said buffer to said transmitting combining circuit a predetermined number of bits after the start of said local time slot, for activating said pseudorandom generator, and for providing said control signals to said storage apparatus at the end of said local time slot.
Claim 5
Dependent Claim
77 words
Asystem for synchronizing communication signals transmitted over a common transmission medium, the system having a plurality of stations each comprising: a. a transmitter and receiver for coupling signals to and from the common transmission medium; b. storage apparatus coupled to said receiver for storing signals from the receiver as received and for providing those signals to an output upon receipt of control signals; c. pseudorandom means for coding data prior to transmission and decoding received data comprising
Claim 6
Dependent Claim
77 words
Asystem for synchronizing communication signals transmitted over a common transmission medium, the system having a plurality of stations each comprising: a. a transmitter and receiver for coupling signals to and from the common transmission medium; b. storage apparatus coupled to said receiver for storing signals from the receiver as received and for providing those signals to an output upon receipt of control signals; c. pseudorandom means for coding data prior to transmission and decoding received data comprising
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) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |