EP0021928A1 - Schreibvorrichtung für Fernsehschirm und Fernschreibsystem mit einer solchen Vorrichtung - Google Patents

Schreibvorrichtung für Fernsehschirm und Fernschreibsystem mit einer solchen Vorrichtung Download PDF

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Publication number
EP0021928A1
EP0021928A1 EP80400812A EP80400812A EP0021928A1 EP 0021928 A1 EP0021928 A1 EP 0021928A1 EP 80400812 A EP80400812 A EP 80400812A EP 80400812 A EP80400812 A EP 80400812A EP 0021928 A1 EP0021928 A1 EP 0021928A1
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EP
European Patent Office
Prior art keywords
signal
photostyle
line
point
screen
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.)
Withdrawn
Application number
EP80400812A
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English (en)
French (fr)
Inventor
Pierre Deman
Henri Butin
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.)
Thales SA
Original Assignee
Thomson CSF SA
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 Thomson CSF SA filed Critical Thomson CSF SA
Publication of EP0021928A1 publication Critical patent/EP0021928A1/de
Withdrawn legal-status Critical Current

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    • 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

Definitions

  • the present invention relates to writing devices on a television screen which make it possible to translate graphic signs into electrical signals as and when these signs are drawn on a screen using a photostyle. It also relates to remote writing systems which make it possible to transmit via a transmission line of any type, in particular telephone, these electrical signals to a distant station on which the graphic signs reproduce at the same time as we trace them to the local post.
  • the writing is jerky since the movement is controlled only by the passage of the pencil over a line of the graphic different from its center.
  • Telewriting devices comprising digitizing tablets and a separate television have also been used, but are unpleasant to use because the tablet on which the pencil moves is not superimposed on the screen.
  • FIG. 1 The general structure of a remote writing device according to the invention is represented in FIG. 1.
  • the graphic signs to be represented will be displayed on a television set 1 of a standard type and using for example a scan at 25 images per second and 625 lines per image.
  • This television receives a video signal from a picture memory 6, and transmits signals from frame and line synchronization to a digitizer 8 and the memory 6.
  • a photosensitive stylus 3 makes it possible to designate a point on the television screen 1 and is connected to the digitizer 8.
  • the digitizer 8 makes it possible to locate the position of the designated point on the screen by photostyle 3 as a function of the synchronization signals received from the television. It transmits to a interpolation and transfer device 7 the digital data designating this point.
  • the transfer and interpolation device proceeds on the one hand to the calculations making it possible to interpolate the drawing between two successive positions of the photostyle 3, and on the other hand to the formation of blocks of characters which are then transmitted to a modem 9, which is connected to a telephone line L.
  • the results of the interpolation are transmitted to the image memory which is loaded with the coordinates of all the points to be displayed on the television. This image memory works out from these coordinates a video signal retransmitted itself to the television set.
  • the digitizer 8 receives, on the one hand from the television, line synchronization signals SL and frame ST respectively on the connections 802 and 801. It also receives photostyle 3, a detection signal DL light on connection 816, a CI registration control signal on connection 828, and an erase control signal CE on connection 831.
  • the signal ST is applied to a line counter 803 from which the first stage has been distinguished in the figure and which it resets to zero. It is also applied to a flip-flop 808 which it positions in a state such that its output connected to an AND gate 811 opens the latter. II ⁇ is finally applied to a register 805, and via an OR gate 806 to a register 807. Both registers are three states respectively rated O, 1 and 2, and are positioned by the signal ST in the state O.
  • the signal SL at each end of line resets to zero a point counter 809 from which the first stage has been distinguished in the figure, by means of the gate 811 opened by the flip-flop 808
  • An AND gate 812 is also applied which is open by the state O of the register 805 and which applies this signal SL to stage 2 of the line counter 803 which thus counts the line synchronization signals.
  • connection 828 When the CI registration command signal arrives, it is applied by connection 828 to the AND gates 814 and 815 which it opens. This signal CI is also applied by the connection 828 to the transfer and interpolation member 7 which, under the control of this signal, sends to the modem 9 a signal for online transmission of the line seizure tone.
  • the signal DL is received on the connection 816.
  • This is applied to a branch circuit 817 symbolized in the figure by a capacitor, and which makes it possible to obtain a first signal corresponding to the leading edge of the signal DL and a second signal corresponding to the trailing edge.
  • These first and second signals are separated by two diodes 818 and 820 connected in opposite directions.
  • the first signal is applied at the output of the diode 818 simultaneously to the AND gates 814 and 819.
  • the gate 814 being opened by the signal CI lets pass the first signal which is then applied to the registers 805 and 807 which advance one step and are positioned in state 1.
  • the door 812 connected to the first stage of the register 805 therefore closes, which prevents the signal SL from being applied to the second stage of the counter 803.
  • the AND gate 821 connected to the second stage of the register 807 via '' a door OR 822 lets through the signal SL which is applied to the first stage of the counter 803. The latter therefore starts counting the lines at a speed half of the previous speed.
  • An AND gate with 3 inputs 823 is opened on the one hand by the flip-flop 808 at the same time as the gate 811, and on the other hand by the second stage of the register 805.
  • This gate 823 lets the pulses of a signal d clock H applied by a connection 68.
  • the frequency of this clock signal is such that the scanning precision along the line is substantially equal to the vertical definition given by the number of lines in a frame.
  • This clock H at the output of gate 823 is applied to the second stage of the point counter 809 which therefore starts to count these clock pulses at a determined speed.
  • this counter 809 is reset to O by the signal SL since the door 811 is always open.
  • the signal from gate 814 advances the two registers 805 and 807 by one step, which go back into state 3.
  • Gate 823 connected to the second stage of register 805 therefore closes, but an AND gate 825 with 3 inputs connected on the one hand to the third stage of register 805 and on the other hand to flip-flop 808 by the same connection which leads to doors 811 and 823 opens his turn.
  • This gate 825 receives the clock H and then applies it to the first stage of the counter 809 which thus begins to count these clock pulses at a speed half the previous speed.
  • the signal SL is applied to an AND gate 824 which is opened by the third stage of the register 805.
  • the signal SL is applied to the register 807. This it can operate as an up-down counter and the output of door 824 is connected to the down-counting input.
  • the register 807 returns from position 2 to position 1.
  • the signal leaving door 814 and indicating the start of the light spot will do so. go back from position 1 to position 2. So all the time that the DL signal produced by the light spot is present, register 807 will go from position 2 to position 1 at the start of the line and from position 1 to position 2 at the start of spot detection.
  • the register 807 At the start of the first line where the DL signal disappears because the light spot is no longer detected, the register 807 returns to position 1 and since it does not return to position 2 during this line, it returns to position O at the end of it, which corresponds to the start of the next.
  • the door 821 then closes but the door 812 does not reopen, and the counter 803 stops.
  • An AND gate 826 connected on the one hand to the third stage of the register 805 and on the other hand to the first stage of the register 807 opens and applies to a connection 827 an LC signal for reading the coordinates of the point of the light spot.
  • the countdown does not start until the line following that on which the DL signal was detected for the first time. This improves the precision of definition of the abscissa.
  • connection 831 When the erase photostyle contact closes, a CE signal appears on a connection 831, while the CI signal disappears from connection 828.
  • the operation of the digitizing device is the same until the DL signal arrives.
  • the first signal from the front edge of the DL signal is delivered by the diode 818 to gates 814 and 819; it is blocked by door 814 which is no longer open since the signal CI no longer exists, but passes through door 819 opened by the signal CE.
  • this first signal causes the flip-flop 808 to toggle through the door 826 so that the doors 823 and 825 to which it is connected close; this same signal positions register 805 in state 2, and register 807 in state O via the OR gate 806.
  • the gate 826 connected to the second stage of the register 805 and to the first stage of the register 807 then transmits on the connection 827 the signal LC which indicates in combination with the signal CE present on the connection 831 that one has in the counters 803 and 809 the coordinates of the point to be deleted.
  • These counters stopped counting as soon as the first signal from the front of signal DL which closed door 812 via the first stage of counter 805, and doors 823 and 825 via flip-flop 808.
  • these coordinates most often indicate a point closer to the start of the line and the top of the frame as that actually displayed since the photostyle detection zone is widened by means which will be seen later in the event of erasure. This is not important since the image memory only contains the coordinates of a single point and it is this which will be deleted. If, however, several light points side by side are lit, they will be erased one after the other as the scans are carried out.
  • This transfer takes place via the transfer and interpolation device 7 which carries out the necessary processing.
  • the frame synchronization signal ST applied to a connection 601 gives O a line counter 602. This rotates under the control of the line synchronization signal SL applied by a connection 603.
  • the signal SL is also applied to the input of reset to O of a point counter 604 which is therefore reset to O at each start of line.
  • This point counter 604 rotates under the action of the clock signal H applied to a connection 68.
  • a point memory 605 consists for example of a shift register containing as many stages as there are points used on the surface of an image. To take into account the different tolerances, for example on the image and line return times, as well as to be able to use this device with different standards, this number of written points is deliberately smaller than the maximum number of points usable in an image. For example, a shift register with a capacity limited to 512 x 512 will be used.
  • This register 605 rotates under the control of the clock H which is delivered to it via an AND gate 606. This gate is not open only during the time when the spot on the screen describes the useful portion of a useful line.
  • the shift register 605 is coupled in circulating memory between its output connection 609 and its input connection 610 by an OR gate 608.
  • the output of gate 608 is also applied to a digital-analog converter 611 which delivers on its output a VI video signal directly applied to the TV. 1.
  • a digital-analog converter 611 which delivers on its output a VI video signal directly applied to the TV. 1.
  • the register 605 delivers a signal 1
  • the latter via the converter 611 is converted into a voltage which is reflected on the screen of the television by the appearance of a light point.
  • the line 602 and point 604 counters are provided with decoding devices which deliver respectively on the connections 631 and 632 opening signals to the door 606 for the time corresponding on the one hand for the counter 602 to the useful lines and d on the other hand for the counter 604 with useful segments on each useful line.
  • door 606 When door 606 is thus open during this period, which corresponds to the moment when the spot on the screen crosses the useful surface, it delivers the clock H to the register 605.
  • the signal TU present on connection 631 is also sent to the transfer and interpolation member. It also receives an IT interrupt signal from the combination in an AND gate 640 of the signal on connection 631 and of the signal SL.
  • the line numbers are transmitted in parallel on a multiple connection 614 in the form of an NL signal from the counter 602.
  • the transfer and interpolation member 7 receives these signals TU, IT, and NL and in return transmits on the multiple connections 615 and 616 respectively the digital signals DS and FS indicating the start and the end of the segment to be recorded. These abscissas are entered in registers 617 and 618.
  • registers 617 and 618 The content of these registers 617 and 618 is permanently applied to the AND gates 619 and 622. These gates are also connected to the counter 604 which continuously transmits its state to them, which changes as the spot moves along d 'a line.
  • the value contained in the register 617 is equal to the state of the counter 604 and the door 619 opens by positioning a flip-flop 620 in a first state.
  • the output of this flip-flop is connected to an AND gate 621 in such a way that this first state corresponds to an opening signal applied to this gate 621.
  • This gate 621 also receives the clock signal H and a signal OI ordering the registration and transmitted from the transfer and interpolation device 7. Under the action of this signal OI and the flip-flop 620, the gate 621 therefore allows the clock H to pass.
  • This clock H transmitted by the door 608 is applied by the connection 610 on the register 605 which then positions the memory points intended to represent light points on the screen on a value 1.
  • the content of the register 618 is equal to the state of the counter 604 and the door 622 opens.
  • the output of this door 622 is applied to the other input of the flip-flop 620 and the latter is positioned in its second state which closes the door 621, thus stopping the positioning of the memory points of the register 605.
  • the transfer and interpolation member 7 sends on the one hand the segment start and end addresses corresponding to two successive points, and on the other hand on a connection 613 an OE signal ordering the erasure on the screen.
  • a NAND gate 624 is connected on the one hand to that of the outputs of the flip-flop 620 which is connected to gate 621, and on the other hand to connection 613.
  • the signal at the output of this gate 624 is always equal to 1 except when there is simultaneously a 1 on the output of the flip-flop 620 and a 1 in input on the connection 613. Outside erasing periods, the gate 623 to which the output of the gate 624 is connected therefore leaves pass the refresh signal from register 605 through connection 609. When on the other hand door 624 closes, its output therefore passing to O, door 623 also closes for the duration of a point and it is therefore no longer refreshed; its indication disappears in register 605 and it goes off on the television screen.
  • connections 612 and 613 are moreover connected to the digital analog converter 611 in order on the one hand to improve the functioning of the photostyle and on the other hand to give the operator information on the action which he sets in motion.
  • the gain and the quiescent point of the output amplifier of the converter 611 are controlled for example using the signals QE and 01.
  • FIG. 4 shows a partial view in section of the photostyle 3.
  • This photostyle comprises a body 3O1 in the end of which slides a transparent cylindrical part 302, made of plastic for example.
  • a photodetector cell 303 for example a photoresistor, is fixed to the end of the cylinder 302 situated inside a cavity dug in the body 301.
  • This cell is supplied from a voltage source + and it outputs the DL signal.
  • the cylinder 302 When the operator presses more strongly on the photostyle, the cylinder 302 is reduced more deeply into the body 301 and the rear of the part 304 comes to press on a part 306 forming a second contact.
  • This part 306 is therefore supplied from the voltage + and delivers on an external connection the erasure control signal CE.
  • An additional spring 307 allows the operator to feel an appreciable difference in resistance when he presses on the photostyle and thus to tactually detect the transition from writing to erasing.
  • a relay 308 which, under the control of the CE signal, cuts the output of the CI signal.
  • Other embodiments using for example logic gates combined in they are usable; for this same purpose, it is also possible to modify the diagram of the digitizing member so that the appearance of the signal CE inhibits the action of the signal CI inside the digitizing member.
  • the modem 9 shown in FIG. 5 comprises a modulator-demodulator proper 91; and an input and output member 92.
  • the input and output device 92 essentially consists of a parallel / serial register, which receives, possibly via a buffer register, the messages ME sent or received in parallel from the transfer device and interpolation 7.
  • This member receives from the modulator-demodulator 91 a clock specific to it via a connection 94.
  • This clock makes it possible to transfer the content of the member 92 to the modulator-demodulator 91 in series. by means of an output connection 93, during transmission, and conversely of filling the member 92 from the modulator-demodulator 91 by an input connection 95.
  • the modulator-demodulator 91 receives from the transfer and interpolation member a transmission control signal TRON, and it then transmits its modulation on the line L.
  • the content of the member 92 is continuously transmitted over the connection 93 and the transfer and interpolation member transmits the message ME at intervals such that there is no loss of information.
  • a decoder internal to organ 92 makes it possible to detect the moment when a complete word constituting a message ME has arrived in this organ 92. It then sends a signal MP to the transfer and interpolation member which allows the latter to take into account the message ME on the output of member 92.
  • the transfer and interpolation member 7, the diagram of which is shown in FIG. 6, is advantageously composed of a microprocessor 71, of the 6800 type for example, of a working memory 72 comprising for example 64 bytes, and a read-only memory 73 comprising for example 1000 program bytes.
  • This microprocessor is connected via a bus type link 74 to a set of peripheral couplers 75 of the PIA type for example.
  • PIA couplers allow all links with the other organs of the remote writing device, with the exception of the interrupt command which is received directly on an IT input of the microprocessor.
  • This 24 eb message will be transmitted or received with each frame and since there are 50 frames per second, there is therefore an online speed of 1200 Bauds. This speed corresponds to a very common modem.
  • FIG. 7 The general organization of the system software is represented in FIG. 7. It can be seen that this software essentially consists of two main programs.
  • An EMI program for entering the registrations memory introduces the information necessary for the drawing of each line and then prepares the information necessary for the next line. This program is triggered on an IT interrupt supplied at each start of useful line from the line synchronization signal SL.
  • a and B the highest and lowest points of the line, and whose coordinates will be m, n and p, q respectively.
  • a logic variable ⁇ internal to the program is assigned a value O or 1.
  • the interpolation routine which takes place between points 5 and 6 makes it possible to calculate the abscissas ⁇ and ⁇ of the start and end of a segment to be written or erased on a line of ordinate ⁇ .
  • This EMI program takes place for the duration of a line due to the speed of the microprocessor used, and begins with the acquisition of the line number NL.
  • NL is greater than n, then we test its value with respect to the ordinate of B. If NL is greater than q, that is to say if the line is below the point ending the segment, we mask the interruption and exit the program via point 1 which leads directly to the PP program; the interruption being thus masked, the following lines of the useful zone will not stop the microprocessor to restart it on the EMI program.
  • the DS, FS, and CE or CI signals are then sent depending on whether you want to delete or write.
  • ⁇ and ⁇ are those calculated beforehand by the PP program.
  • the device according to the invention can comprise several screens and photostyles located in the vicinity, the common operation of which is obtained by sending on all of the same video signal and by the parallel connection of the contacts and output signals of the photodiodes, thus allowing the realization of a conference with telewriting.
  • Two identical groups located remotely comprising the device which can thus be connected by the telephone line as devices with a single screen and a single photostyle.
  • such a group can be connected remotely to any device capable of interpreting the messages transmitted, or of emitting similar ones, for example a computer allowing the storage of graphic information.

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  • General Physics & Mathematics (AREA)
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EP80400812A 1979-06-12 1980-06-06 Schreibvorrichtung für Fernsehschirm und Fernschreibsystem mit einer solchen Vorrichtung Withdrawn EP0021928A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7914995A FR2458969A1 (fr) 1979-06-12 1979-06-12 Dispositif d'ecriture sur ecran de television et systeme d'ecriture a distance comprenant un tel dispositif
FR7914995 1979-06-12

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EP0021928A1 true EP0021928A1 (de) 1981-01-07

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EP80400812A Withdrawn EP0021928A1 (de) 1979-06-12 1980-06-06 Schreibvorrichtung für Fernsehschirm und Fernschreibsystem mit einer solchen Vorrichtung

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0069196A1 (de) * 1981-07-08 1983-01-12 AEG Olympia Office GmbH Einrichtung zur Veränderung und Korrektur eines Textes
EP0114093A2 (de) * 1983-01-08 1984-07-25 Fujitsu Limited Radierer für eine elektronische Tafel
EP0116082A1 (de) * 1982-07-29 1984-08-22 Telease Inc Sicheres kodier- und dekodiersystem und verfahren für fernsehprogrammsignale.
EP0139941A1 (de) * 1983-08-24 1985-05-08 Siemens Aktiengesellschaft Röntgendiagnostikanlage mit einer Patientenlagerstatt und einer Primärstrahlenblende
US4591841A (en) * 1983-11-01 1986-05-27 Wisconsin Alumni Research Foundation Long range optical pointing for video screens

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3569617A (en) * 1968-04-05 1971-03-09 Univ New South Wales Graphic display facility for computing
US3758717A (en) * 1970-05-28 1973-09-11 Ibm Se information free hand drawing display system utilizing light pen to write and era

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3569617A (en) * 1968-04-05 1971-03-09 Univ New South Wales Graphic display facility for computing
US3758717A (en) * 1970-05-28 1973-09-11 Ibm Se information free hand drawing display system utilizing light pen to write and era

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IBM TECHNICAL DISCLOSURE BULLETIN, vol. 18, no. 8, janvier 1976, pages 2654-2655, New York, U.S.A., J.SIMMONS: "Determining the Center of an Analog Pulse". *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0069196A1 (de) * 1981-07-08 1983-01-12 AEG Olympia Office GmbH Einrichtung zur Veränderung und Korrektur eines Textes
EP0116082A1 (de) * 1982-07-29 1984-08-22 Telease Inc Sicheres kodier- und dekodiersystem und verfahren für fernsehprogrammsignale.
EP0116082A4 (de) * 1982-07-29 1987-03-12 Telease Inc Sicheres kodier- und dekodiersystem und verfahren für fernsehprogrammsignale.
EP0114093A2 (de) * 1983-01-08 1984-07-25 Fujitsu Limited Radierer für eine elektronische Tafel
EP0114093A3 (en) * 1983-01-08 1984-08-15 Fujitsu Limited An eraser for an electronic blackboard
EP0139941A1 (de) * 1983-08-24 1985-05-08 Siemens Aktiengesellschaft Röntgendiagnostikanlage mit einer Patientenlagerstatt und einer Primärstrahlenblende
US4591841A (en) * 1983-11-01 1986-05-27 Wisconsin Alumni Research Foundation Long range optical pointing for video screens

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