EP0020242A2 - Verfahren zum Alignieren von Teletextzeichen und Vorrichtung zur Durchführung des Verfahrens - Google Patents

Verfahren zum Alignieren von Teletextzeichen und Vorrichtung zur Durchführung des Verfahrens Download PDF

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Publication number
EP0020242A2
EP0020242A2 EP80400709A EP80400709A EP0020242A2 EP 0020242 A2 EP0020242 A2 EP 0020242A2 EP 80400709 A EP80400709 A EP 80400709A EP 80400709 A EP80400709 A EP 80400709A EP 0020242 A2 EP0020242 A2 EP 0020242A2
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EP
European Patent Office
Prior art keywords
characters
row
alignment
line
character
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.)
Granted
Application number
EP80400709A
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English (en)
French (fr)
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EP0020242B1 (de
EP0020242A3 (en
Inventor
Jean-François Marquet
Charles Hernandez
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
CONTINENTALE DE SIGNALISATION Cie
Original Assignee
Telediffusion de France ets Public de Diffusion
CONTINENTALE DE SIGNALISATION Cie
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Publication of EP0020242A2 publication Critical patent/EP0020242A2/de
Publication of EP0020242A3 publication Critical patent/EP0020242A3/fr
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    • 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
    • G09G5/22—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the display of characters or indicia using display control signals derived from coded signals representing the characters or indicia, e.g. with a character-code memory
    • G09G5/24—Generation of individual character patterns

Definitions

  • the present invention relates to a method for aligning teletext characters on the screen of a television receiver.
  • the invention also relates to a device for implementing such a method.
  • a teletext system is described in French patent application 2 363 949.
  • the display of characters on the screen of the television receiver is controlled by a character generator supplied with data by an image memory.
  • the characters are grouped in horizontal rows, each of which is formed by a number of television scan lines, equal to 10 according to the ANTIOPE specification.
  • the ANTIOPE system also provides for the possibility of doubling the height of the characters, by repeating the display element from one line to the next line. If the row - which then has a double number of lines - contains single height characters (1H) and double height characters (2H), the application of the above principle will lead to a pronounced misalignment since the letters 2H legs will have a jamb of 4 lines in height and we will end up with a shift of 2 lines between the letters 1H and the letters 2H, sufficient to destroy the alignment in the eyes of the spectator.
  • the invention provides for analyzing the data of a row during the scanning of the first non-displayed line of this row and for adjusting the alignment of the characters as a function of the data obtained.
  • the method according to the invention by taking into account the parameters 1) and 2) above when scanning the first line, allows satisfactory alignment of the characters in all cases.
  • case c) the difference between the alignment of the characters 2H and that of the characters 1H is 1 line, and is not perceptible to the spectator.
  • Figures la to lc represent a part of the teletext display screen, on which the word LYON appears.
  • a row of characters usually occupies 10 scanning lines, but we only consider here the cases where the row comprises one or more double height characters (2H) and consequently presents a doubled height, namely 20 lines sweep.
  • the lines are therefore numbered from 1 to 20 in each of the figures la to lc.
  • the alignment mode illustrated in FIG. 1 a is identical to that of the rows comprising only 1H characters, namely that the body of the characters is arranged with a deviation of 2 lines from the bottom of the row which corresponds to the height a leg of character lH.
  • This mode of alignment corresponds to the case where the characters 1H (Y, O, N) and 2H (L) coexist in the same row, and where no character 2H contains a jamb.
  • the characters 2H are obtained simply by repeating the display element of one line on the next line.
  • the alignment mode in Figure 1b is used when the row consists exclusively of 2H characters. In this case, whether or not the row has legged characters, the alignment is offset by 2 lines compared to the previous case. In other words, the body of the characters is spaced 4 lines from the bottom of the row, this space being occupied by the legs whose height represents 4 lines (2 x 2).
  • the alignment mode illustrated in FIG. 1c is applied in the case where a row comprises both 1H characters and 2H characters and where at least one of the 2H characters is strung.
  • This alignment mode consists in shifting the body of the 2H characters by 3 lines from the bottom of the row, by eliminating the repetition of the 2nd display element of the legs. It can thus be seen in FIG. 1c that the horizontal leg of the Y leg is not doubled, contrary to what is observed in FIG. 1b.
  • the 1H characters present in the row have their normal arrangement, that is to say that the body of the 1H characters is separated by 2 lines from the bottom of the row.
  • the resulting difference between the characters 1H and 2H is not disturbing for the spectator, because it is limited to one line.
  • the selection of the alignment mode therefore requires the knowledge of two elements characterizing the row considered.
  • the first element AL1 concerns the coexistence of characters 1H and 2H, and the second element AL2 the presence of characters 2H legs.
  • FIG. 2 shows a device allowing the elements AL1 and AL2 to be taken into account with a view to selecting the alignment mode.
  • the device shown comprises a PROM memory 1 which supplies the character generator 2 with a four-wire exploration sequence AGCl to AGC4 which controls the mode of alignment of the characters.
  • the memory 1 receives on four wires ADL1 to ADL4 the line address of the row considered, between 0 and 9, which is supplied by a line counter incremented by each line synchronization signal.
  • Memory 1 receives a signal 2H indicating that the character analyzed is double height, a signal S / I indicating that one is in the upper half row or in the lower half row of a double height row.
  • the memory also receives the signals AL1 and AL2 supplied respectively by flip-flops 3 and 4.
  • the flip-flops 3 and 4 are flip-flops of the JK type.
  • Its input K receives the signal 2H indicating that the character analyzed is double height.
  • Its P input (Preset) is connected to an AND-NO gate 5 which receives the output signal from an AND gate 6 to which the TLG line tops are applied and the LGNIO signal which appears when the 10th line in each row is scanned.
  • Gate 5 also receives the inverted S / I signal, which is in the "1" state when exploring the lower half-row of a double-height row.
  • the signal applied to the input P therefore passes to the state "0" at the arrival of the top line of the last line of the row which precedes the row to be explored.
  • the taking into account of the signal S / I avoids an untimely change of state of the flip-flop 3 during the passage from the upper half-row to the lower half-row of a double height row.
  • a clock signal H is applied to flip-flop 3 at each character time interval.
  • the output of flip-flop 3 is set to state "1" during the top line TLG of the last line LGN10 of the previous row, and it remains in this state if all the characters in the row are double height. But it is enough that a single character is single height for the level of the 2H signal to go to "O". The output Q then goes to state "O".
  • the flip-flop 4 has its input P also connected to the output of the AND-NO gate 5.
  • Inputs J and H are connected in the same way as on flip-flop 3.
  • the input K is connected to an AND-NO gate 7 receiving on one input the aforementioned 2H signal and having its other input connected to an AND gate 8 which receives a BIT ⁇ signal supplied by the character generator indicating that the analyzed character is strung , and a signal LGN ⁇ indicating that we are exploring the first row in the row.
  • the Q output of flip-flop 4 is set to the "0" state by the signal from the gate 5. It goes to the "1" state when a 2H character is explored during the 1st row of the row.
  • the alignment mode is that of FIG. 1b.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Television Systems (AREA)
  • Controls And Circuits For Display Device (AREA)
  • Character Input (AREA)
EP80400709A 1979-05-23 1980-05-21 Verfahren zum Alignieren von Teletextzeichen und Vorrichtung zur Durchführung des Verfahrens Expired EP0020242B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7913238A FR2458849A1 (fr) 1979-05-23 1979-05-23 Procede d'alignement de caracteres de teletexte et dispositif pour la mise en oeuvre de ce procede
FR7913238 1979-05-23

Publications (3)

Publication Number Publication Date
EP0020242A2 true EP0020242A2 (de) 1980-12-10
EP0020242A3 EP0020242A3 (en) 1981-02-04
EP0020242B1 EP0020242B1 (de) 1983-06-08

Family

ID=9225828

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80400709A Expired EP0020242B1 (de) 1979-05-23 1980-05-21 Verfahren zum Alignieren von Teletextzeichen und Vorrichtung zur Durchführung des Verfahrens

Country Status (8)

Country Link
US (1) US4321596A (de)
EP (1) EP0020242B1 (de)
JP (1) JPS55161483A (de)
CA (1) CA1162292A (de)
DE (1) DE3063666D1 (de)
ES (1) ES491633A0 (de)
FR (1) FR2458849A1 (de)
SU (1) SU961571A3 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9674560B1 (en) 1981-11-03 2017-06-06 Personalized Media Communications LLC Signal processing apparatus and methods
USRE47642E1 (en) 1981-11-03 2019-10-08 Personalized Media Communications LLC Signal processing apparatus and methods

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2496376B1 (fr) * 1980-12-11 1985-06-28 Signalisation Continental Procede et systeme de teletexte pour l'affichage de donnees sur l'ecran d'un recepteur de television
JPS5818699A (ja) * 1981-07-27 1983-02-03 リコーエレメックス株式会社 音声符号化装置
US7831204B1 (en) 1981-11-03 2010-11-09 Personalized Media Communications, Llc Signal processing apparatus and methods
GB2145909B (en) * 1983-09-01 1987-05-13 Philips Electronic Associated A double height algorithm for crt character display
IT1162945B (it) * 1983-09-30 1987-04-01 Olivetti & Co Spa Apparecchiatura di visualizzazione di immagini definite da una pluralita di righe di dati
US4660028A (en) * 1984-11-01 1987-04-21 Microtel Limited Stroke-vector character generator
US4672370A (en) * 1984-11-01 1987-06-09 Microtel Limited Technique for scaling characters in a stroke-vector display system
US4658248A (en) * 1984-11-01 1987-04-14 Microtel Limited Method for generating stroke-vector characters for use in a display system
US4841435A (en) * 1986-10-29 1989-06-20 Saxpy Computer Corporation Data alignment system for random and block transfers of embedded subarrays of an array onto a system bus
JPH02110497A (ja) * 1988-10-19 1990-04-23 Mitsubishi Electric Corp 画像表示装置
JP3016515B2 (ja) * 1989-01-31 2000-03-06 キヤノン株式会社 文字処理装置および方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1518149A (en) * 1975-09-24 1978-07-19 Yokogawa Electric Works Ltd Graphic display device
US4163229A (en) * 1978-01-18 1979-07-31 Burroughs Corporation Composite symbol display apparatus

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4987246A (de) * 1972-12-22 1974-08-21
US4233628A (en) * 1979-01-11 1980-11-11 Zenith Radio Corporation NTSC receiver useable with Teletext/Viewdata information

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1518149A (en) * 1975-09-24 1978-07-19 Yokogawa Electric Works Ltd Graphic display device
US4163229A (en) * 1978-01-18 1979-07-31 Burroughs Corporation Composite symbol display apparatus

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
TOUTE L'ELECTRONIQUE, No. 439, Janvier 1979 Paris FR "Le Systeme Antiope", pages IV-IX * Page VI, colonne du milieu, paragraphe "Tailles variables" * *

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9674560B1 (en) 1981-11-03 2017-06-06 Personalized Media Communications LLC Signal processing apparatus and methods
US10334292B1 (en) 1981-11-03 2019-06-25 Personalized Media Communications LLC Signal processing apparatus and methods
USRE47642E1 (en) 1981-11-03 2019-10-08 Personalized Media Communications LLC Signal processing apparatus and methods
US10523350B1 (en) 1981-11-03 2019-12-31 Personalized Media Communications LLC Signal processing apparatus and methods
USRE47867E1 (en) 1981-11-03 2020-02-18 Personalized Media Communications LLC Signal processing apparatus and methods
US10609425B1 (en) 1981-11-03 2020-03-31 Personalized Media Communications, L.L.C. Signal processing apparatus and methods
US10616638B1 (en) 1981-11-03 2020-04-07 Personalized Media Communications LLC Signal processing apparatus and methods
USRE47968E1 (en) 1981-11-03 2020-04-28 Personalized Media Communications LLC Signal processing apparatus and methods
US10715835B1 (en) 1981-11-03 2020-07-14 John Christopher Harvey Signal processing apparatus and methods
USRE48484E1 (en) 1981-11-03 2021-03-23 Personalized Media Communications, Llc Signal processing apparatus and methods
USRE48565E1 (en) 1981-11-03 2021-05-18 Personalized Media Communications LLC Providing a subscriber specific solution in a computer network
USRE48633E1 (en) 1981-11-03 2021-07-06 Personalized Media Communications LLC Reprogramming of a programmable device of a specific version

Also Published As

Publication number Publication date
ES8103607A1 (es) 1981-03-16
EP0020242B1 (de) 1983-06-08
FR2458849A1 (fr) 1981-01-02
JPS55161483A (en) 1980-12-16
FR2458849B1 (de) 1985-01-18
SU961571A3 (ru) 1982-09-23
JPS647675B2 (de) 1989-02-09
DE3063666D1 (en) 1983-07-14
EP0020242A3 (en) 1981-02-04
ES491633A0 (es) 1981-03-16
CA1162292A (en) 1984-02-14
US4321596A (en) 1982-03-23

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