[go: up one dir, main page]

EP0025748B1 - Dispositif de transmission numérique et affichage de graphismes et/ou de caractères sur un écran - Google Patents

Dispositif de transmission numérique et affichage de graphismes et/ou de caractères sur un écran Download PDF

Info

Publication number
EP0025748B1
EP0025748B1 EP80401266A EP80401266A EP0025748B1 EP 0025748 B1 EP0025748 B1 EP 0025748B1 EP 80401266 A EP80401266 A EP 80401266A EP 80401266 A EP80401266 A EP 80401266A EP 0025748 B1 EP0025748 B1 EP 0025748B1
Authority
EP
European Patent Office
Prior art keywords
memory
storage
data
circuit
input
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP80401266A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0025748A1 (fr
Inventor
Bernard Lorig
Jean-Claude Rahuel
Catherine Roux
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telediffusion de France ets Public de Diffusion
Original Assignee
Telediffusion de France ets Public de Diffusion
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Telediffusion de France ets Public de Diffusion filed Critical Telediffusion de France ets Public de Diffusion
Publication of EP0025748A1 publication Critical patent/EP0025748A1/fr
Application granted granted Critical
Publication of EP0025748B1 publication Critical patent/EP0025748B1/fr
Expired legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C21/00—Systems for transmitting the position of an object with respect to a predetermined reference system, e.g. tele-autographic system
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/36—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the display of a graphic pattern, e.g. using an all-points-addressable [APA] memory
    • G09G5/39—Control of the bit-mapped memory
    • G09G5/393—Arrangements for updating the contents of the bit-mapped memory

Definitions

  • the present invention relates to a device for digital transmission and display of graphics and / or characters on a screen according to the preamble of claim 1. It finds an application in the transmission and display on devices of visualization, such as television receivers, of writings, drawings, characters, etc., for any purpose of assistance with discussion, information, information, identification, authentication, teaching or distraction. It is a system for exchanging or receiving information through any transmission network, whether interactive or broadcast.
  • Telewriting devices are growing in importance and interest from day to day. It will be recalled that these devices comprise, at the end of a line or of a transmission channel, means for acquiring graphics, which may have various shapes (graphic tablets, photostyles, rolling balls, etc.) capable of periodically deliver the coordinates of the points constituting the plotted graphics, these coordinates then being coded, then transmitted over the transmission line or channel, and, at the other end, means for decoding the received signals and signal display devices decoded, such as cathode ray tubes, plasma panels, plotters, special printing machines, etc., these bodies reproducing the graphics plotted on the acquisition means.
  • graphics which may have various shapes (graphic tablets, photostyles, rolling balls, etc.) capable of periodically deliver the coordinates of the points constituting the plotted graphics, these coordinates then being coded, then transmitted over the transmission line or channel, and, at the other end, means for decoding the received signals and signal display devices decoded, such as cathode ray tubes, plasma panels, plotters, special printing machines, etc
  • Fig. 1 very schematically recalls the elements of a telewriting system.
  • a system includes telewriting sets 2, 2 ′, 2 ", etc., which exchange information through a transmission network 3.
  • Each set includes a graphics acquisition system 4 (such as, for example, that a graphics tablet for writing, erasing, erasing, etc.), a terminal 5 which acquires the information coming from the tablet, which gives them a format suitable for transmission over the network 3 and stores them, and finally, a display member 6.
  • the terminal 5 also processes the information sent to it from the assemblies 2 ′ and 2 "through the network 3, stores it and ensures its display on the member 6, at the same time as those from device 4.
  • the transmission network 3 of FIG. 1 contains the appropriate modulation and demodulation equipment.
  • This network can be point-to-point: two-wire telephone line (leased or switched), four-wire telephone line, telegraph line, Transpac network, Caduceus network, Transmic network, etc., or broadcast type: television (with or without using the Didon system), radio with frequency or amplitude modulation, etc.
  • This list of networks or transmission channels is given for information only and is in no way limiting.
  • a network with a bit rate of at least 200 bits / s is currently required to transmit a write without delay.
  • more sophisticated coding of information transmitted online can be used to reduce this rate.
  • the writing is transmitted with a delay which depends on the quantity of data to be transmitted and on the transmission capacity of the channel or of the network.
  • Such an assembly comprises a terminal 5 associated with a graphics acquisition device 4 and with a display member 6 on a screen.
  • the terminal 5 is organized around a circuit 7 for processing digital data connected to the graphics acquisition device 4 via a junction 9 and to the network 3 via a junction 10.
  • Lecircuit7 receives of one or the other of these junctions of the digital data notably comprising the X and Y coordinates of the points making up the graphics and display codes (color, eraser, inlay, etc.) or information making it possible to reconstruct them.
  • Each terminal also comprises a member 11 for storing this digital data inserted between the data processing system 7 and a display control module 12, the latter controlling the display of the corresponding points by the display member 6.
  • the circuit 7 decodes the information it receives, in order to reconstitute all the points of the curve of graphics or writing. These points are then stored in the image memory 11 in which each point to be displayed is represented by a memory element in black and white display systems and by two memory elements in two-color display systems.
  • the processing circuit 7 reconstructs the points of the graph or writing curve, and stores them in the memory 11 as indicated above.
  • the processing circuit 7 develops the codes to be sent to the correspondent through the junction 10 and the transmission network 3.
  • the image memory supplies the display control module 12 with information from which the latter generates baseband video signals intended for the display unit 6, of the mainstream color television type for example.
  • a clock signal generator 8 paces the various organs of the terminal and in particular the processing system 7 and the display control module 12. In particular, the access time to the image memory 11 are shared, thanks to the signals clock, between the processing system 7 and the module 12 in order to avoid access conflicts.
  • the present invention proposes to remedy these drawbacks and therefore to increase the information capacity offered to users and achieves this aim by the characteristics a to c of claim 1.
  • the terminal of the invention therefore comprises, according to a plurality of memory planes constituted by direct access memories of sufficient capacity to be able to each contain all the information corresponding to a complete image covering the screen, these memory plans being all validated in parallel, simultaneous access to several memory plans is possible.
  • Three planes can be used for example to memorize the images, each point to be displayed on the screen being associated with a point of each of the three planes, each plan being assigned to the memorization of one of the fundamental colors, red, blue or green . Each point can be lit or not in each of the three basic colors, and therefore in all their combinations.
  • a fourth memory plan can be used to memorize the different drawings or graphics as they are developed. The memory of these drawings is retained after the screen is completely erased and this recording remains available for the rest of the conversation.
  • a fifth plane can be used to obtain a blinking of the points, etc.
  • each memory is associated with a generator of logic functions controlled by appropriate codes and able to combine the words to be written with words already written in the memory. This combination takes place during the writing cycle of the memory plans.
  • any logical combination of writing between two words is possible for performing complex functions, and this in only two cycle times, and a single request for access to the memory, which considerably improves the overall performance of the system.
  • the temporal information between the two plots will be preserved by resorting to the incrustation of one or more points of a color between other points of different color.
  • This operation requires the combination of the word already written in the memory plans and containing the point written with the word to be written containing this same point, which is achieved by the circuit of the invention.
  • the operation of such a device is broadly in line with that of the prior devices.
  • the information to be viewed by the member 6 comes from the telewriting terminal 5 which holds it either from another terminal connected to the previous one by the transmission network 3, or from the graphics acquisition device 4. In the latter case, the information is also sent to the other terminals of the system.
  • the information acquired by the terminal 5 is transformed by the circuit 7 and supplied, with the appropriate control codes, to the write and read control circuit 15. If necessary, the circuit 7 processes the information in order to send it through the transmission network 3.
  • the write / read assembly 15 directs the information in memory, according to the commands provided by the circuit 7, in the various memory planes 18, 19, 20, 21, ...
  • the module display control command 12 reads the information in memory and routes a red, green, blue composite video television signal in baseband to the display device by the conductors 23.
  • the clock generator 8 supplies the various clock signals necessary for the circuit 7 and for the display control module 12. Sequencing information carried by a wire 17 intervenes in the circuit 7 and in the display module 12 to manage the access to the memory plans 18, 19, 20, 21, ..., so as to avoid the conflicts which could occur and the switching parasites on the display device 6.
  • the addressing circuit 14, first of all, is shown in FIG. 4. It includes an address calculation unit 50 which receives the X and Y coordinates of the point to be displayed, or, if the standards of the organ display 6 are different from those of the acquisition device 4, the coordinates X 'and Y' of said point counted according to the standards of the display member.
  • the circuit 14 includes programmable read only memories (PROM) 56 and 56 'receiving the coordinates X and Y respectively and delivering the transformed coordinates X' and Y '.
  • PROM programmable read only memories
  • the figure corresponds to the particular case where the display device is a 525-line television set to North American standards. In this case, only the Y coordinate, corresponding to the line number, is to be transformed.
  • the Y coordinate is supplied to the programmable memory 56 'which delivers the modified Y' coordinate via the connection 57.
  • the memory 56 ' is filled so as to match the coordinates Y and Y'.
  • the X coordinate for its part, remains unchanged and is supplied directly by the connection 55 to the address calculation unit 50, the memory 56 which is shown in dashes then being absent.
  • the address calculation unit 50 it comprises two memories 59 and 60 respectively receiving the coordinates X 'and Y' and an address calculator 61.
  • the display member is a television receiver of which 512 lines are used on each of which 768 points are sampled, each line being broken down into 96 groups of 8 points. It therefore takes three bits or bits to locate a point in a group and 7 bits to locate the group in the line, or a total of 10 bits to define the address X '.
  • the address Y specifies the rank of the line among 512 and therefore includes 9 bits.
  • the memory 59 is therefore 10 bits and the memory 60 is 9 bits. All of the 19 bits are sent to the address calculator 61.
  • the circuit 50 delivers, on an output connection 53, a byte P ; comprising a binary element at 1 at a determined location, and an address for this byte, consisting of two other bytes.
  • the assembly 15 may also include a programmable read-only memory 69 (PROM) for code conversion, to an input connected to the third output 62 ′ "of the selector circuit 62, from which it receives a logic function code, and to a output 72 delivering a code suitable for the generator of logic functions, but this memory can also be accommodated in this generator.
  • PROM programmable read-only memory
  • FIG. 6 The organization of a memory plan is illustrated in FIG. 6.
  • This memory is made up of memory blocks 78 associated with buffer memories 80. Each block has a write input 77 ′, a read output 79 ′, a validation input 65 ′ and finally an address input 73 '.
  • the input 65 ' is connected to the connection 65 coming from the validation memory 64, the input 77' to a connection 77, the output 79 'to a connection 79 connected to the buffer memory 80, and the input d 'addressing 73' to connection 73 from address memory 70.
  • Each memory plane further comprises a logic function generator 75 having a control input 72 'connected to the connection 72 from the memory 69, a first signal input 71' connected to the connection 71 from the memory d 'byte 63, a second signal input _76' connected to a connection 76 connected to the buffer memory 80 and a signal output connected by a connection 77 to the input 77 'for writing from the memory.
  • a logic function generator 75 having a control input 72 'connected to the connection 72 from the memory 69, a first signal input 71' connected to the connection 71 from the memory d 'byte 63, a second signal input _76' connected to a connection 76 connected to the buffer memory 80 and a signal output connected by a connection 77 to the input 77 'for writing from the memory.
  • the input byte O is conveyed from memory 63 to the logic function generator 75 by connection 71 while the address of this byte reaches memory by connection 73 from memory 70.
  • M the byte that is already in memory at this address.
  • This byte is transmitted to generator 75 by connection 76, which then has two bytes to combine O ; and M ; .
  • the combination it performs is determined by a function code developed in the data processing circuit 7 from the indications provided by the operator. This code, after having possibly been converted into a circuit 69, is supplied to the generator by connection 72.
  • the byte resulting from the combination of O ; and M is then conveyed by connection 77 to input 77 'of the memories, and it is this byte which is written.
  • the writing will be effective in the memory plans which will have been validated by application of a validation signal on the connections 65, 66, 67, etc.
  • the memory is completed by a buffer register 81 and by buffer registers 82 which are connected to the outputs of blocks 78 and form a shift register.
  • the output connection 83 is directed to the display control module 12.
  • the process of logical combination between the bytes O i and M i will now be specified.
  • the function to be performed is defined by a 5-bit binary code: the most significant element determines the two cycle times which are necessary for carrying out the various erasing, writing by overwriting, writing by overlay functions. , cursor, etc. The first time corresponds to bit 0 and the second to bit 1. The remaining bits define the logic function to be performed.
  • this point is deleted in the three planes assigned to the three colors.
  • O i complementary to O i and we combine 0, with M ; by a logical AND operation, which provides a new byte of which all the elements are zero.
  • O i ⁇ M i ⁇ M i where the point represents the logical AND operation.
  • the code for this AND function can be noted, for example, 0001 and, since this is the first time in the cycle, a binary element of high significance 0 is associated with it, which finally gives the code 00001.
  • the selector 62 delivers then this function code 00001 in memory 69 by connection 74, and the validation codes of the three color planes in memory 64.
  • the point in question must be written in the blue memory map.
  • the memory 64 validates only this plan; the function code goes to 10001, the most significant bit at 1 indicating that it is the second time of the cycle; for this second step, the code 0001 corresponds to a logical OR operation between the bytes O i and M i , operation noted O i + M i ⁇ M i , the sign + indicating, depending on usage, the OR operation. This results in writing in point overlay in the blue memory plane.
  • the table is divided into two parts: the upper part corresponding to the first time of the cycle (binary element of greatest weight at 0) and the lower part corresponding to the second time of the cycle (binary element to 1).
  • the four previous operations a, b, c and d are represented with the logical operations carried out.
  • the conventions on logical operations have already been indicated, the sign ⁇ corresponding to the OR-exclusive operation.
  • Antiope Digital Acquisition and Image Television Organized in Writing Pages
  • Titan Interactive Teletext Terminal with Call by Dialing
  • a broadcast Videotex system (therefore unidirectional) making it possible to insert on television channels alphanumeric information organized in pages and magazines.
  • an interactive Videotex system (therefore bidirectional) compatible with the Antiope system and allowing access to databases (general information, directories, etc.) and to interactive services (transactions , messages, teaching) via the telephone network.
  • Videotex systems are essentially limited to the transmission and display of characters and semi-graphics.
  • the telewriting terminal which has been described above, can, at the cost of a few additions, also fulfill the functions of the Videotex terminal.
  • the invention makes it possible to offer a user provided with a single terminal, the two types of communications, Videotex and telewriting, whereas, previously, the user had to have two types of terminals.
  • the invention allows a third type of communication by the combination of the two systems which complement each other: Videotex offers possibilities for total graphics (and no longer only semi-graphics) and telewriting. opens for the transmission of Videotex type characters and graphics.
  • Videotex mode the information coming from the transmission network 3 is coded to the Videotex standards defined in the documents cited in reference.
  • the alphanumeric keyboard 104 selects the information transmitted by the network. For this, the characters typed on this keyboard reach circuit 7 in Ascii code on 7 bits of one byte (the eighth is a parity bit).
  • the circuit 7 transmits these characters directly to the transmission junction 10 which sends them to the network 3.
  • the latter contains the modulation and demodulation organs, selection of the pages and adaptation of the information transmission speed.
  • Videotex in the broadcast version all the adaptations concerning the reception of information according to the Didon and Antiope systems are known.
  • Videotex in interactive version only a modulator-demodulator is necessary.
  • the PLC On power-up, the PLC is in one of these states, for example always in state 1. It remains in this state as long as it does not find, in the transmitted codes, the continuation of the three bytes 9B / 25/61. When these three bytes occur, it goes into state 2 corresponding to telewriting, from the telewriting code output code; this code is an OF coded byte sent in the byte synchronization state of the telewriting transmission.
  • the mode management and storage circuit 100 therefore controls the junction 10 by indicating to it in which mode it must work.
  • the circuits 100 dialog with the data processing circuit 7 to indicate what type of data are transmitted to it.
  • a link 101 indicates, by its electrical state, what type of data are passing between 10 and 7. This link 101 controls the circuit 7 and specifies the mode to be used on reception.
  • Control of the operating mode of circuit 7 on transmission is obtained by discrimination in the peripheral supplying the data knowing that the tablet corresponds to telewriting and the alphanumeric keyboard to Videotex.
  • the member 100 controls the operating mode. In addition, the member 100 eliminates the mode change codes included in the information passing between the junction 10 and the circuit 7.
  • the member 100 In the transmission direction, each time the operating mode 7 of the circuit 7 is detected, the member 100 causes the necessary mode change codes to be transmitted by the junction 10.
  • the system has a memory for display attributes: character color, background color, character size, continuous or separate graphic, normal, inverted background, etc.
  • This memory is addressed by the decoding of the commands of the display attributes. It supplies to circuit 7 the information for filling the display memory.
  • Circuit 7 also has a memory for moving the cursor in coordinates (X, Y). This memory is updated as a function of the writing in the character display memory or of the cursor movement commands.
  • the circuit 7 will draw, from the character form memory 106, the bytes to be written in the various plans of the memory. These bytes are possibly modified according to the display attributes.
  • Circuit 7 restarts this procedure as many times as necessary to write a character.
  • a character is coded on 20 lines with 16 points per line, it is necessary to make forty writes of bytes in the display memory plans.
  • the device which has just been described allows the transmission of information intended to reveal a colored surface of any shape on a screen.
  • the present invention overcomes these drawbacks and therefore increases the information capacity offered to users, improves the image quality and limits user fatigue.
  • one of the memory plans of the terminal is used for temporary storage of information relating to this application.
  • the acquisition device such as for example the graphic tablet, has additional facilities for the user to indicate his desire to fill the interior, the exterior or both, with a surface that he has delimited.
  • the additional memory plan is organized so as to be able to easily fill the memory plans containing the data constituting the displayed synthetic image.
  • the surface to be colored can be described by the curve constituting its border.
  • the data representing this curve is transmitted by the network or the transmission channel; the coding can be of the telewriting type, equation of the curve, following the coordinates of the points constituting the curve.
  • the data relating to the surface boundary, after shaping by the processing circuit, are stored in the memory plane assigned to this task and according to a particular procedure.
  • the data processing unit searches for this information once the transmission is finished, in order to store the necessary data in the planes constituting the memory of the image to be displayed. As soon as this phase is completed, the filling memory plan becomes available again for any other use.
  • a user of the system wishes to transmit a surface whose interior (for example) is of a chosen color.
  • he uses the graphics tablet to indicate the color and the filling function using any means such as a button, button, switch, etc.
  • this tablet it only traces the border of the surface. This border is a continuous and closed curve.
  • Its terminal transmits it in the form of a digital code established by the processing circuit 7; transmission is via the network or channel 3.
  • the transmission code can be that of telewriting.
  • the terminal On reception, the terminal receives the data coming from the network 3, on the junction 10.
  • the processing device 7 receives the data.
  • a binary element positioned indicates that the following curve corresponds to a colored surface.
  • circuit 7 no longer writes the points of the curve in the display memories, for example the planes 18, 19 and 20, but in a special memory plane, for example the plane 21.
  • This plane -memory is organized in the same way as the others, that is to say that the same binary element corresponds to the same point to be displayed on the display device 6. This is not compulsory, but greatly facilitates the work of the circuit 7.
  • the circuit 7 decodes the data coming from the line and sets to 1 the binary elements of the plane 21 corresponding to the points of the border.
  • this rule There are several exceptions to this rule. First of all, if the corresponding point has been written previously (this is for example the case of a double point), this point must be reset to 0. I must then favor a direction, the vertical or the horizontal. We can choose the horizontal, the reasoning remaining valid if it is the vertical which is chosen. In the case where the border has a horizontal part (case of a curve having a maximum, a minimum or an inflection point), only the first point of the horizontal is set to 1, the other points being unchanged.
  • circuit 7 must memorize the last point before the horizontal and compare to the point following the horizontal to know whether or not there has been a change of side of the curve with respect to the horizontal.
  • the circuit 7 passes to the phase of construction and display of the surface.
  • the plane 21 is scanned along the horizontal lines to be displayed.
  • a binary element at 1 means that, from this point, we cross the border.
  • the first binary element at 1 corresponds to the passage inside and the second outside.
  • a third binary element at 1 passes inside, a fourth outside, etc.
  • the circuit 7 can reconstruct the surface and fill the display memories 18, 19 and 20 with the necessary elements according to the procedure already described.
  • the colored surface is displayed, and the plane 21 can be reset to zero for later use.
  • the sequence of data received from network 3 may not correspond to a closed curve.
  • the processing circuit 7 detects this anomaly because the first and the last point of the curve do not coincide. This can happen with telewriting codes.
  • the processing circuit 7 then automatically closes the curve by joining the last point received to the first point received by a line segment.
  • the information contained in the plane 21 will always relate to a closed curve, and therefore to the border of a surface.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Controls And Circuits For Display Device (AREA)
  • Television Systems (AREA)
EP80401266A 1979-09-12 1980-09-05 Dispositif de transmission numérique et affichage de graphismes et/ou de caractères sur un écran Expired EP0025748B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7922780A FR2465281A1 (fr) 1979-09-12 1979-09-12 Dispositif de transmission numerique et d'affichage de graphismes et/ou de caracteres sur un ecran
FR7922780 1979-09-12

Publications (2)

Publication Number Publication Date
EP0025748A1 EP0025748A1 (fr) 1981-03-25
EP0025748B1 true EP0025748B1 (fr) 1983-07-20

Family

ID=9229584

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80401266A Expired EP0025748B1 (fr) 1979-09-12 1980-09-05 Dispositif de transmission numérique et affichage de graphismes et/ou de caractères sur un écran

Country Status (6)

Country Link
US (1) US4424572A (ja)
EP (1) EP0025748B1 (ja)
JP (1) JPS56110989A (ja)
BR (1) BR8005823A (ja)
DE (1) DE3064284D1 (ja)
FR (1) FR2465281A1 (ja)

Families Citing this family (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58209784A (ja) * 1982-05-31 1983-12-06 株式会社東芝 メモリシステム
JPS59266A (ja) * 1982-06-26 1984-01-05 Fujitsu Ltd 電子黒板装置の色情報入力方式
DE3380465D1 (en) * 1982-09-20 1989-09-28 Toshiba Kk Video ram write control apparatus
US5129061A (en) * 1982-11-10 1992-07-07 Wang Laboratories, Inc. Composite document accessing and processing terminal with graphic and text data buffers
US4587633A (en) * 1982-11-10 1986-05-06 Wang Laboratories, Inc. Management communication terminal system
IT1159408B (it) * 1983-05-13 1987-02-25 Olivetti & Co Spa Apparecchiatura di stampa per terminali di comunicazione tipo videotex
JPS6066291A (ja) * 1983-09-21 1985-04-16 富士通株式会社 メモリ・プレ−ン書込み制御方式
US4601010A (en) * 1983-12-19 1986-07-15 Briscoe Robert J Converter device for a computer terminal
FR2560412B1 (fr) * 1984-02-24 1993-12-31 Canon Kk Appareil de traitement de donnees
US4648045A (en) * 1984-05-23 1987-03-03 The Board Of Trustees Of The Leland Standford Jr. University High speed memory and processor system for raster display
DE3588173T2 (de) * 1984-07-23 1998-06-10 Texas Instruments Inc Videosystem
FR2570524B1 (fr) * 1984-09-19 1987-01-02 Matra Communication Terminal de tele-informatique a extensions externes
US4941088A (en) * 1985-02-05 1990-07-10 Digital Equipment Corporation Split bus multiprocessing system with data transfer between main memory and caches using interleaving of sub-operations on sub-busses
US4742474A (en) * 1985-04-05 1988-05-03 Tektronix, Inc. Variable access frame buffer memory
US4755810A (en) * 1985-04-05 1988-07-05 Tektronix, Inc. Frame buffer memory
EP0202014B1 (en) * 1985-04-13 1996-02-28 Quantel Limited Improvements in video image creation systems
US4710758A (en) * 1985-04-26 1987-12-01 Westinghouse Electric Corp. Automatic touch screen calibration method
US4882687A (en) * 1986-03-31 1989-11-21 Schlumberger Technology Corporation Pixel processor
FR2611942B1 (fr) * 1987-02-25 1991-11-29 France Etat Serveur a large bande, en particulier pour la transmission de musique ou d'images
CA1288516C (en) * 1987-07-31 1991-09-03 Leendert M. Bijnagte Apparatus and method for communicating textual and image information between a host computer and a remote display terminal
US5091849A (en) * 1988-10-24 1992-02-25 The Walt Disney Company Computer image production system utilizing first and second networks for separately transferring control information and digital image data
US5262965A (en) * 1988-10-31 1993-11-16 Bts-Broadcast Television Systems, Inc. System and method for high speed computer graphics image computation using a parallel connected, asynchronous multiprocessor ring coupled to a synchronous special purpose video processing ring
JPH06501802A (ja) * 1990-10-01 1994-02-24 ブッシュ，トーマス，エイ． トランザクション処理システム
US5250940A (en) * 1991-01-18 1993-10-05 National Semiconductor Corporation Multi-mode home terminal system that utilizes a single embedded general purpose/DSP processor and a single random access memory
JP3215137B2 (ja) * 1992-01-24 2001-10-02 株式会社リコー 遠隔会議用通信端末装置
US5495284A (en) * 1993-03-12 1996-02-27 Katz; Ronald A. Scheduling and processing system for telephone video communication
US20030185356A1 (en) * 1993-03-12 2003-10-02 Telebuyer, Llc Commercial product telephonic routing system with mobile wireless and video vending capability
US6323894B1 (en) 1993-03-12 2001-11-27 Telebuyer, Llc Commercial product routing system with video vending capability
US7019770B1 (en) * 1993-03-12 2006-03-28 Telebuyer, Llc Videophone system for scrutiny monitoring with computer control
US7830587B2 (en) * 1993-03-17 2010-11-09 Qualcomm Mems Technologies, Inc. Method and device for modulating light with semiconductor substrate
US20020120545A1 (en) * 1994-01-27 2002-08-29 Ronald A. Katz Commercial product routing system with video vending capability
US6057929A (en) * 1997-07-21 2000-05-02 Aecx Corporation System and method for producing substantially identical drawing prints using dissimilar printing systems

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3534338A (en) 1967-11-13 1970-10-13 Bell Telephone Labor Inc Computer graphics system
US3925776A (en) 1974-04-18 1975-12-09 Research Corp Display terminal system
JPS559742B2 (ja) * 1974-06-20 1980-03-12
JPS52126A (en) * 1975-06-23 1977-01-05 Nippon Telegr & Teleph Corp <Ntt> Multi-purpose picture display unit using multi-layer memory
US4070710A (en) 1976-01-19 1978-01-24 Nugraphics, Inc. Raster scan display apparatus for dynamically viewing image elements stored in a random access memory array
US4103331A (en) 1976-10-18 1978-07-25 Xerox Corporation Data processing display system
US4094000A (en) 1976-12-16 1978-06-06 Atex, Incorporated Graphics display unit
JPS5831591B2 (ja) * 1976-12-29 1983-07-07 富士通株式会社 任意位置へのパタ−ン表示方式
JPS53136439A (en) * 1977-05-04 1978-11-29 Hitachi Ltd Handwritten information processing system
US4303986A (en) 1979-01-09 1981-12-01 Hakan Lans Data processing system and apparatus for color graphics display

Also Published As

Publication number Publication date
FR2465281B1 (ja) 1983-03-11
FR2465281A1 (fr) 1981-03-20
EP0025748A1 (fr) 1981-03-25
DE3064284D1 (en) 1983-08-25
BR8005823A (pt) 1981-03-24
JPS56110989A (en) 1981-09-02
US4424572A (en) 1984-01-03

Similar Documents

Publication Publication Date Title
EP0025748B1 (fr) Dispositif de transmission numérique et affichage de graphismes et/ou de caractères sur un écran
EP0243312B1 (fr) Décodeur pour un système de télévision à péage
FR2590099A1 (fr) Procede pour transmettre une image de haute definition par un canal de communication a bande etroite
EP0309355A1 (fr) Système de communication vidéo interactif
EP0019545A1 (fr) Système de vidéographie muni de moyens de protection contre les erreurs de transmission
FR2780804A1 (fr) Dispositif de controle de l&#39;affichage de caracteres dans un systeme video
FR2543721A1 (fr) Dispositif de generation d&#39;images sur un ecran dans un systeme de visualisation commande par ordinateur
FR2511826A1 (fr) Procede et appareil pour transmettre des informations numeriques par canal de television
FR2519456A1 (fr) Generateur d&#39;effets graphiques
EP0055167B1 (fr) Procédé et dispositif pour la visualisation de messages sur un dispositif d&#39;affichage à trame balayée tel qu&#39;un écran d&#39;un tube à rayons cathodiques par utilisation d&#39;un ensemble mémoire composite
FR2641658A1 (fr) Generateur de signaux de commande pour un melangeur de signaux video
EP0055168B1 (fr) Procédé et dispositif pour la visualisation de messages composés de pages sur un dispositif d&#39;affichage à trame balayée tel qu&#39;un écran d&#39;un tube à rayons cathodiques
FR2458863A1 (fr) Terminal d&#39;affichage video et procede d&#39;affichage mixte graphique et alphanumerique
EP0161175A1 (fr) Dispositif pour modifier l&#39;aspect des points d&#39;une image sur un écran d&#39;une console de visualisation d&#39;images graphiques
FR2477745A1 (fr) Dispositif d&#39;affichage graphique en couleurs
FR2723797A1 (fr) Procede de codage de memoire image
EP0056207A1 (fr) Procédé et dispositif pour la visualisation de messages transmis par un signal du type télévision, sur un dispositif d&#39;affichage à trame balayée tel qu&#39;écran d&#39;un tube à rayons cathodiques, ledit message comportant des éléments répétitifs
FR2503901A1 (fr) Reseau telematique de consultation d&#39;informations a distance
EP0792071A1 (fr) Dispositif de décodage de signaux de type MPEG2
EP1217834B1 (fr) Procédé et circuit de mémorisation de données numériques, et téléviseur mettant en oeuvre ledit procédé de mémorisation
EP0209441B1 (fr) Procédé de transcodage d&#39;une image vidéotex pour la rendre compatible avec plusieurs systèmes vidéotex
EP0201428B1 (fr) Circuit de commande pour machine graphique et utilisation d&#39;un tel circuit dans une machine graphique interactive
EP0191656A1 (fr) Générateur de caractères et utilisation d&#39;un tel générateur dans un système de visualisation
FR2817695A1 (fr) Procede et dispositif associe d&#39;affichage de texte sur un ecran d&#39;un recepteur de television
JP2825927B2 (ja) 画像処理装置

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): BE CH DE FR GB IT SE

17P Request for examination filed

Effective date: 19810828

ITF It: translation for a ep patent filed
GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Designated state(s): BE CH DE FR GB IT LI SE

REF Corresponds to:

Ref document number: 3064284

Country of ref document: DE

Date of ref document: 19830825

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 19900822

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19900823

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19900924

Year of fee payment: 11

ITTA It: last paid annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19910906

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19910930

Ref country code: CH

Effective date: 19910930

Ref country code: BE

Effective date: 19910930

REG Reference to a national code

Ref country code: FR

Ref legal event code: TP

BERE Be: lapsed

Owner name: LORIG BERNARD

Effective date: 19910930

Owner name: ETABLISSEMENT PUBLIC DE DIFFUSION TELEDIFFUSION D

Effective date: 19910930

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

EUG Se: european patent has lapsed

Ref document number: 80401266.4

Effective date: 19920408

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19950905

Year of fee payment: 16

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19950914

Year of fee payment: 16

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19950928

Year of fee payment: 16

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19960905

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19960930

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19960905

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19970603

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST