US3976972A
Expired / Lapsed
US
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Prevention of non-allowed character combinations
Assignee: Telefonaktiebolaget LM Ericsson AB
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Filing: 1975-02-24
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Granted: 1976-08-24
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Expires: 1995-02-24
Abstract
Abstract A method is disclosed to prevent the transmission of non-allowed character combinations of signal elements which have for example, a route administrating or a control function. In the sender a sequence of the information carrying signal elements is formed. The sequence is divided into parts each including N-n signal elements. New character signals are formed by completing each of such parts with n signal elements, selected in such manner that only characters which are allowed are formed and the formed characters are transmitted to the receiver. In the receiver such parts including N-n signal elements are restored by removing the n signal elements for each character signal. Then a sequence of the original information carrying signal elements is formed and the last mentioned sequence of signal elements is divided in the original character signals consisting of N information elements.
Inventors
- 👤 Kurt Arvid Aman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:44
CPC Classifications
H; H03; H03M; H03M5/00; H04; H04L; H04L13/00; H04L13/02; H04L13/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
183 words
In an information system for serially transferring characters, wherein each character is represented by a coded combination of N signal elements which are transmitted serially in a single channel, a method of encoding characters to be transmitted so that non-allowable groups of N sequential signal elements are not transmitted comprising the steps of serially generating characters represented by groups of N signal elements, serially arraying the generated characters into a stream of the signal elements, sequentially selecting each N-n of the signal elements of the stream without exception to form partial character groups of signal elements so that every signal element is in one of the partial character groups and some of the signal elements of a generated character are in one of the partial character groups and the remainder of the signal elements of the generated character are in an adjacent partial character group, and inserting into each partial character group n signal elements to form transmittable character groups, said n signal elements being selected so that the combination of signal elements of each transmittable character group represents only an allowable character.
Claim 2
Dependent Claim
183 words
In an information system for serially transferring characters, wherein each character is represented by a coded combination of N signal elements which are transmitted serially in a single channel, a method of encoding characters to be transmitted so that non-allowable groups of N sequential signal elements are not transmitted comprising the steps of serially generating characters represented by groups of N signal elements, serially arraying the generated characters into a stream of the signal elements, sequentially selecting each N-n of the signal elements of the stream without exception to form partial character groups of signal elements so that every signal element is in one of the partial character groups and some of the signal elements of a generated character are in one of the partial character groups and the remainder of the signal elements of the generated character are in an adjacent partial character group, and inserting into each partial character group n signal elements to form transmittable character groups, said n signal elements being selected so that the combination of signal elements of each transmittable character group represents only an allowable character.
Claim 3
Dependent Claim
216 words
Apparatus for encoding and transmitting characters so that only allowable character combinations represented by coded combinations of N signal elements which represent binary information will be transmitted comprising: a source of serially generated groups of N-n signal elements, said source comprising means for generating characters represented by sets of N signal elements, means for serially arraying said sets of N signal elements, and means for separating the signal elements in the serial array into groups of N-n signal elements wherein every signal element is in one of said groups and some of the signal elements of each set is one of said groups and the remainder of the signal elements of the set are in another of said groups; storing means for sequentially storing each group of N-n signal elements; logic means connected to said storing means for generating n signal elements for each stored group of N-n signal elements, the n signal elements being chosen so that said n signal elements and the N-n signal elements of the associated group form a group of N signal elements representing only an allowable character; and means connected to said storing means and said logic means for sequentially transmitting each group of N-n signal elements in sequence with its associated n signal elements generated by said logic means.
Claim 4
Dependent Claim
216 words
Apparatus for encoding and transmitting characters so that only allowable character combinations represented by coded combinations of N signal elements which represent binary information will be transmitted comprising: a source of serially generated groups of N-n signal elements, said source comprising means for generating characters represented by sets of N signal elements, means for serially arraying said sets of N signal elements, and means for separating the signal elements in the serial array into groups of N-n signal elements wherein every signal element is in one of said groups and some of the signal elements of each set is one of said groups and the remainder of the signal elements of the set are in another of said groups; storing means for sequentially storing each group of N-n signal elements; logic means connected to said storing means for generating n signal elements for each stored group of N-n signal elements, the n signal elements being chosen so that said n signal elements and the N-n signal elements of the associated group form a group of N signal elements representing only an allowable character; and means connected to said storing means and said logic means for sequentially transmitting each group of N-n signal elements in sequence with its associated n signal elements generated by said logic means.
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) | 1979-08-24 | 1980-02-23 | 1980-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-24 | 1984-02-23 | 1984-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-24 | 1988-02-23 | 1988-08-24 | $7700.00 | Window Closed / Lapsed |