US3597757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Visualization device with sets of variable characters
Assignee: MERLIN JEAN CLAUDE
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Filing: 1970-01-20
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Granted: 1971-08-03
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Expires: 1990-01-20
Abstract
Abstract System for displaying characters or patterns on the screen of a cathode-ray tube, with each character or pattern formed by a group of vectors and with each vector represented by a binary vector word of which one bit controls illumination and extinction of the spot tracing the vector on the screen and the other bits selectively define predetermined directions of incremental tracks of the spot. The system allows characters stored in a character store in the form of character words including a plurality of vector words to be selectively displayed. The character store is associated with a character address register and upon reception of a character address in said register, the character stored at that address in the character store is displayed. The system permits also the change of the stored characters. For this, a character address word called in the following ''''fictitious address word'''' is sent from a remote station; it contains, as a part thereof a vector word contained in the character word of the character to be changed. A selection or chopper circuit chops off suitable bits of the fictitious address word to convert it into the vector word included therein. A function combination detector channels the true character address words towards the address register and the fictitious character address words towards the chopper circuit.
Inventors
- 👤 Jacques J Vincent-Carrefour
- 👤 Jean-Claude Merlin
- 👤 Philippe Pitard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:53
CPC Classifications
G; G09; G09G; G09G1/00; G09G1/06; G09G1/08; G09G1/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
222 words
A system for displaying characters on the screen of a cathode-ray tube, with each character formed of a group of vectors and with each vector represented by a binary vector word of which one bit controls illumination and extinction of the spot tracing the vector on the screen and the other bits selectively define predetermined directions of the tracks of the spot, the system comprising a character store for storing groups of vector words defining the groups of character-forming vectors to form each character, a binary address register associated with said character store, the address of each character in said character store having a larger number of bits than the number of bits in the vector word defining each vector, and means for changing the character corresponding to a given address, said character changing means comprising means adapted to transmit the digital addresses of a plurality of particular characters, each of said addresses including a respective vector word of the new character, means arranged to store temporarily only the bits of preselected weights of the address of each said particular character, each said particular character being selected so that the stored bits form a vector word representing a respective vector of the new character, and means for transferring each vector word representing a vector of the new character into the character store.
Claim 2
Independent Claim
222 words
A system for displaying characters on the screen of a cathode-ray tube, with each character formed of a group of vectors and with each vector represented by a binary vector word of which one bit controls illumination and extinction of the spot tracing the vector on the screen and the other bits selectively define predetermined directions of the tracks of the spot, the system comprising a character store for storing groups of vector words defining the groups of character-forming vectors to form each character, a binary address register associated with said character store, the address of each character in said character store having a larger number of bits than the number of bits in the vector word defining each vector, and means for changing the character corresponding to a given address, said character changing means comprising means adapted to transmit the digital addresses of a plurality of particular characters, each of said addresses including a respective vector word of the new character, means arranged to store temporarily only the bits of preselected weights of the address of each said particular character, each said particular character being selected so that the stored bits form a vector word representing a respective vector of the new character, and means for transferring each vector word representing a vector of the new character into the character store.
Claim 3
Independent Claim
273 words
A system for displaying characters on the screen of a cathode-ray tube, with each character formed of a group of vectors and with each vector represented by a binary vector word of which one bit controls illumination and extinction of the spot tracing the vector on the screen and the other bits selectively define predetermined directions of the tracks of the spot, the system comprising a character store for storiNg groups of vector words defining the groups of character-forming vectors to form each character, a binary address register associated with said character store, the address of each character in said character store having a larger number of bits than the number of bits in the vector word defining each vector, means for receiving the character addresses of the characters to be displayed and for displaying on the screen a character stored in the character store at a received character address, and means for changing the character corresponding to a given address, said character-changing means comprising means for receiving a predetermined number of fictitious addresses of a plurality of particular characters, each of said fictitious addresses including a respective vector word of the character to be changed, and the address of the character to be changed, means for selecting in said fictitious addresses only the bits of preselected weights which form the vector word included therein, means for counting the number of fictitious addresses and for directing to the address register the address of the character to be changed, and means for transferring each vector word derived from the fictitious addresses into the character store at the address of the character to be changed.
Claim 4
Independent Claim
273 words
A system for displaying characters on the screen of a cathode-ray tube, with each character formed of a group of vectors and with each vector represented by a binary vector word of which one bit controls illumination and extinction of the spot tracing the vector on the screen and the other bits selectively define predetermined directions of the tracks of the spot, the system comprising a character store for storiNg groups of vector words defining the groups of character-forming vectors to form each character, a binary address register associated with said character store, the address of each character in said character store having a larger number of bits than the number of bits in the vector word defining each vector, means for receiving the character addresses of the characters to be displayed and for displaying on the screen a character stored in the character store at a received character address, and means for changing the character corresponding to a given address, said character-changing means comprising means for receiving a predetermined number of fictitious addresses of a plurality of particular characters, each of said fictitious addresses including a respective vector word of the character to be changed, and the address of the character to be changed, means for selecting in said fictitious addresses only the bits of preselected weights which form the vector word included therein, means for counting the number of fictitious addresses and for directing to the address register the address of the character to be changed, and means for transferring each vector word derived from the fictitious addresses into the character store at the address of the character to be changed.
Claim 5
Dependent Claim
58 words
A system for displaying characters according to claim 2 which comprises in addition a detector of a function combination signal and means under the control of this detector for channelling the character addresses towards the address register and the fictitious character addresses serving for elaborating the vector words of the character to be changed towards the selecting means.
Claim 6
Dependent Claim
109 words
A system for displaying characters according to claim 2, in which certain fictitious character addresses include a significant vector word and other fictitious character addresses include a zero vector word, of which only the fictitious character addresses including a significant vector word are transmitted and received in the fictitious character address-receiving means and the vector words derived therefrom transferred into the character store, the system comprising a first inverter for the binary digit of the highest weight in each vector word derived from a fictitious character address, and a second inverter for the binary digit of the highest weight of all the vector words extracted from the character store.
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) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |