WO2002051145A1 - Procede et dispositif associe de memorisation de sous pages teletexte - Google Patents
Procede et dispositif associe de memorisation de sous pages teletexte Download PDFInfo
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- WO2002051145A1 WO2002051145A1 PCT/FR2001/003972 FR0103972W WO0251145A1 WO 2002051145 A1 WO2002051145 A1 WO 2002051145A1 FR 0103972 W FR0103972 W FR 0103972W WO 0251145 A1 WO0251145 A1 WO 0251145A1
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- WIPO (PCT)
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/08—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division
- H04N7/087—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical blanking interval only
- H04N7/088—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical blanking interval only the inserted signal being digital
- H04N7/0882—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical blanking interval only the inserted signal being digital for the transmission of character code signals, e.g. for teletext
Definitions
- the subject of the invention is a method and an associated device for storing teletext sub-pages, and a television receiver implementing said storing method.
- the present invention relates to the field of teletext as defined in particular in the standard ETS 300 706, updated in May 1997 (ETS: in English, "Enhanced Teletex Standard”).
- Teletext is an ancillary service for television channels intended to transmit, in addition to video information, information written in the form of digital data.
- a complete teletext service for a television channel breaks down into a variable number of pages (between 100 and 899 according to the ETS standard).
- Each page breaks down itself into one or more sub-pages (between 0 and 79 according to the ETS standard). All the sub-pages of the same page form a coherent whole in terms of informative content, which it is preferable to consult in chronological order, starting from the first sub-page.
- a complete service of a television channel can thus include up to approximately 71,000 sub-pages and the whole is broadcast continuously in a cyclic manner, but not necessarily in chronological order. Each sub-page is thus distributed approximately every 40s.
- the digital data relating to a sub-page is grouped in the form of data packets.
- One of the packages often called a header package, includes references to the subpage to which it is attached. These references are for example of the form "sub-page 5 of page 54", thus indicating the number or the rank of the sub-page (5), the number of the page to which it belongs (54).
- Navigation systems exist, which help a user of the teletext service to more or less easily locate the page which interests him.
- the choice of a page is made for example by indicating the number of the requested page.
- the movement in the different sub-pages of the same page is then done by commands of type "previous sub-page” / "next sub-page", or directly by specifying the number of the sub-page.
- a device dedicated to the teletext service comprises, in accordance with FIG. 1, a decoder 11, a data memory 12, a display memory 13 and a display means 14.
- the decoder 11 receives the digital data relating to the sub-pages of a service and stores some of them in the data memory 12.
- the decoder 11 copies the sub-page requested from the data memory 12 in the display memory 13.
- a display means 14 finally comes to continuously read the content of the display memory 14 and copy it onto a screen 15 of the television receiver. If the requested sub-page is already stored in the data memory 12, then its display is immediate.
- the number of stored sub-pages essentially depends on the size of the data memory 12, which is very variable from one device to another.
- the number of stored sub-pages also depends on the volume of digital data relating to each sub-page, which can vary from one sub-page to another.
- the number of sub-pages that can be memorized is for example of the order of 10 to 15; it is a compromise between on the one hand the average display time of a requested page, which decreases when the number of stored pages increases, and on the other hand the cost of the device, which increases sharply with the size of the data memory 12.
- the number of stored sub-pages is therefore limited compared to the total number of sub-pages or pages of a teletext service.
- the decoder 11 manages the content of the memory 12 as a function of the sub-pages broadcast continuously by the transmitting chain and the requests of the user, real or estimated requests in particular from the sub-page being displayed, if a sub-page is displayed.
- the decoder 11 stores the sub-pages as they are received. If the memory 12 is full, then the decoder 11 continues to memorize the sub-pages as and when they are received, by erasing the previously memorized sub-pages. Since only a dozen sub-pages are stored in our example, the probability is low for a sub-page to be present in memory when the user requests its display. Consequently, the average display time of a sub-page of the teletext service is important.
- the order of dissemination of the sub-pages of a service as well as the total number of sub-pages distributed vary according to the day of broadcast, the broadcasting station, etc.
- the device is activated during the broadcast of a teletext service, the pages of the start of the service are not received immediately, but only during the next broadcast cycle. It is ultimately difficult to predict which sub-page is contained in the memory 12 at a given time.
- sub-page 1 corresponds to the start of the information contained in a page.
- An objective of the invention is to decrease the average display time of a sub-page, by increasing the probability that a sub-page is already present in memory when the user requests it.
- Another object of the invention is to allow the user to directly access the start of the information relating to a teletext page.
- the invention relates to a method for memorizing sub-pages of a teletext service comprising at least one page to be memorized, said page to be memorized comprising at least one sub-page, the method being characterized in that :
- a desired sub-page is stored, and possibly sub-pages adjacent to the desired sub-page are stored until a maximum number of stored sub-pages is reached or until a limited number of sub-pages of the page to be stored is achieved.
- the maximum number of stored sub-pages is defined by the user or the manufacturer of a television receiver using the method of the invention. In practice, this number is directly linked to the size of the data memory used to store the pages or sub-pages. This number is for example of the order of 2 to 3 if the data memory is of sufficient size to store 10 to 15 pages or sub-pages. ]
- the limit number of sub-pages for a page is the total number of sub-pages of the same page, it is variable and is fixed by the television channel which broadcasts the program.
- neighbored sub-page and more generally the expressions “neighboring page”, “close page”, etc., should be understood here in the following sense.
- a page A is said to be close (or close) to a page B if, when page B is displayed, the probability is high that the user will request the display of page A after having looked at page B.
- the sub-pages of rank A + l and Al are close to the sub-page of rank A because the sub-pages of the same page are most often browsed in chronological order, by their very nature of sub-pages .
- the rank 1 subpages of all pages in the service are close to a higher rank subpage and any of the pages in the service.
- the desired sub-page is a sub-page of rank 1 of the page to be stored, and the sub-pages adjacent to the desired sub-page are the sub-pages of rank closest to 1.
- the rank 1 sub-page is immediately displayed, the rank 1 sub-page corresponding to the start of the information contained in the page, the page possibly containing several sub-pages.
- the method is advantageously implemented by carrying out the following steps:
- ⁇ El initialization of a counter, to count the number of stored sub-pages
- E2 storage of the row 1 sub-page of the page to be stored, and update of the counter
- E5 storage of sub-pages close to the desired sub-page and update of the counter, step E5 being repeated until the counter reaches a maximum number of stored sub-pages.
- Step E5 includes par. example of the following substeps:
- This embodiment is for example used if the user has not (yet) requested the display of a page.
- the sub-page of rank 1 (the desired sub-page), and the sub-pages of rank 2, 3, etc. close to the sub-page of rank 1, are memorized.
- the user thus has very easy and immediate access to the information contained in the page to be stored.
- This embodiment can for example be chosen as the default embodiment and be used in particular when no specific sub-page is requested by the user when requesting the display of a page.
- the desired sub-page is a sub-page of rank X0 requested by a user
- the sub-pages adjacent to the desired sub-page are sub-pages immediately preceding the desired sub-page and / or sub-pages immediately following the desired sub-page.
- step E4 is carried out, executed before or after step E2:
- E4 memorization of a desired subpage of rank 1X0 of the page to memorize, and update of the counter.
- Step E5 is also completed by sub-step E55, carried out after or before sub-step E52:
- E55 if the negative loop variable is greater than 0, then storage of the subpage of rank equal to the negative loop variable, then updating the counter and the negative loop variable.
- This embodiment is for example used when the sub-page of rank X0 (the desired sub-page) a page Y0 (the page to memorize) is being displayed at the request of the user. In this case, the sub-pages of rank X0, 1, X0 + 1, X0-1, etc. are stored.
- the teletext service comprises several pages to be stored, each page comprising at least one sub-page.
- a desired sub-page is memorized, which is either a sub-page of rank 1 or a sub-page of rank X0 requested by the user.
- sub-pages adjacent to the desired sub-page are stored until a maximum number of stored sub-pages of the page to be stored is reached or until a limit is reached on the number of sub-pages of the page to be stored.
- the maximum number of stored sub-pages is defined by the user or . the manufacturer of a television receiver using the method of the invention. In practice, this number is directly linked to the size of the data memory used to store the pages or sub-pages. This number is for example of the order of 2 to 3 if the data memory is of sufficient size to store 10 to 15 pages or sub-pages.
- the limit number of sub-pages for a page is the total number of sub-pages of the same page, it is variable.
- the invention also relates to a storage device comprising a data memory for storing a teletext page comprising at least one sub-page, the circuit being characterized in that it comprises a decoder arranged to implement a method as described here -above.
- the invention also relates to a television receiver comprising a storage device such as the one above.
- FIG. 1 already described, is a functional diagram of a device dedicated to the teletext service, according to the prior art, and FIGS. 2 and 3 are diagrams of setting algorithms implementing a storage method according to the invention.
- the storage method according to the invention is implemented in a device dedicated to a teletext service similar to a known device such as that shown in FIG. 1; it notably comprises a data memory 12, a display memory 13 and a display means 14 identical to those of the known prior art and connected in a similar manner.
- the device also includes a new decoder arranged to implement the method for storing teletext sub-pages of the invention.
- a new decoder arranged to implement the method for storing teletext sub-pages of the invention.
- the sub-page XO of the page YO of a teletext service broadcast is requested by a user and must therefore be stored. It is also assumed that it is planned to store at best a MAXYO number of sub-pages of the page YO, including the sub-page of rank 1, the sub-page of rank XO and sub-pages neighboring the XO subpage.
- XO, YO are set by the user.
- the steps of the method are presented in FIG. 2.
- a variable NB_SS_PGES is initialized to 0; this variable is used to count the number of stored sub-pages and to check that this number does not exceed the MAXYO number.
- NB_SS_PGES NB_SS_PGES + 1.
- a test is carried out to check whether the number of sub-pages already stored has not reached its maximum value MAXYO. If the value
- step E5 is then carried out, in order to memorize the sub-pages neighboring the sub-page XO.
- Step E5 breaks down as follows.
- two loop variables are initialized:
- variable SS_PAGE1 is used to access the sub-pages following the current sub-page: X0 + 1, X0 + 2, etc.
- the variable ss-page2 is used in the same way- way for the sub-pages preceding the current sub-page XO - 1, XO - 2, etc.
- a new test is carried out to check whether the number of sub-pages already stored has not reached its limit value MAXYO.
- step E5 ends, if not, a step E52 is carried out.
- step E52 the sub-page of rank -_] S_PAGE1 is stored, and the variables SS_PAGE1 and NB_SS_PGES are updated:
- NB_SS_PGES NB_SS_PGES + 1.
- step E53 identical to step E51, a test is carried out. If the maximum number MAXYO of sub-pages to be memorized is reached (negative test) then step E5 ends, otherwise a step E54 is carried out.
- test E54 it is checked if the loop variable SS_PAGE2 is positive. If the test is negative, then a new step E51 is carried out, otherwise a step E55 is carried out.
- NB_SS_PGES NB_SS_PGES + 1.
- step E55 a new step E51 is carried out.
- the process of FIG. 2 ends when the number of stored sub-pages has reached its maximum value MAXYO (when one of the tests E3, E51 or E53 is negative).
- the process of FIG. 2 is interrupted and then carried out again if the user requests the display of a new page or sub-page.
- the subpages of rank 1, XO, XO + l, X0-1, XO + 2, XO-2, etc. are memorized, until the maximum number MAXYO of sub-pages to memorize is reached.
- the order in which the sub-pages are stored depends in particular on the order in which the sub-pages are received by the decoder.
- the order in which the sub-pages are stored is also indifferent when carrying out the method of the invention. It can be modified, by exchanging steps E2 and E4, or alternatively by performing step E52 twice and then step E55 twice, for example.
- the main thing is to memorize the XO sub-page, sub-page 1 and neighboring sub-pages of the XO sub-page.
- the XO rank sub-page of the YO page is displayed in parallel, since it is requested by the user. If the latter then wishes to have the continuation of the page YO which he consults, the display of the next sub-page XO + 1 will be immediate since it is already memorized. If, on the contrary, the user wishes to access the beginning of the information contained in the page YO, he will very easily have access to sub-page 1 of the page YO since sub-page 1 has been previously stored.
- sub-pages of the page YO of a teletext service must be stored although the user has not requested the display of the page YO or one of its sub-pages (the user has for example requested the display of a page close to the YO page or no page is displayed). It is also assumed that it is planned to store at best a MAXYO number of sub-pages of the page YO. In this case, it is chosen to store the sub-page 1 of the page YO and the neighboring sub-pages of the sub-page 1. In this example, the user has immediate access to the sub-page 1 of the page. YO if he asks for it the display and sub-pages 2, 3, 4, etc. are available. The user thus has direct access to the start of the information contained in the YO page and can consult the sub-pages of the YO page in chronological order.
- step E5 is in this case carried out after step E2. This deletion is justified because the sub-step 1 is already memorized during the step E2.
- the XO sub-page of the YO page is requested by the user, so it must be memorized in order to be displayed.
- Pages Y0 + 1, Y0-1, adjacent to YO must also be memorized. For this, for each page adjacent to the YO page, the subpages 1, 2, 3, etc. must be memorized. The user has access very quickly to pages or closest subpages of subpage he asked on the screen.
- the steps E10, E20 are repeated until all the pages and all their desired subpages are memorized and / or until the data memory is full.
- the page YO is stored, in particular its subpages of rank 1, XO and the subpages adjacent to the subpage of rank XO.
- a page close to the YO page is stored, and in particular the sub-pages 1, 2, 3, etc. of the page next to the YO page.
- the process is interrupted and then executed again if the user requests the display of a new page or of a new sub-page.
- the page YO and its neighboring pages Y0 + 1, Y0-1, YO + 2, YO-2 are stored, with their respective sub-pages.
- the choice of pages to be stored can be made according to the priority number.
- the mode of choice of the pages Y to memorize does not modify the mode of memorization of the sub-pages of the same page.
- the MAXY number of sub-pages is considered to be constant. It is however possible to envisage memorizing a variable number of sub-pages according to the memorized page. For this, it suffices to modify the step El to add an initialization of the number MAXY as a function of the value of Y.
- the same page comprises a number of sub-pages NB_LIMY greater than the number MAXY chosen.
- this is not necessarily the case.
- some pages of the service can include a reduced number NB_LIMY of sub-pages, or even a single sub-page.
- the method is advantageously improved by adding a complementary step E51 ', between steps E51 and E52, to test whether the variable )
- SS_PAGE1 is less than the NB_LIMY number of page Y being stored. If SS_PAGE1 is less than NB_LIMY, then step E52 is carried out, if not, step E54 is carried out.
- NB__LIMY corresponds to the number of existing sub-pages for a given Y page.
- the NB_LIMY number can be variable from one Y page to another. In this case, it is preferably initialized during step E1.
- NB_SS_PGES MAX (YO) of sub-pages memorized for the page YO and / or within the limit of the number of sub-pages NB_LIM of the page YO.
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Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01271751A EP1350390A1 (fr) | 2000-12-21 | 2001-12-13 | Procede et dispositif associe de memorisation de sous pages teletexte |
US10/451,181 US20040046892A1 (en) | 2000-12-21 | 2001-12-13 | Method and associated device for storing teletext sub-pages |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0016854A FR2818857A1 (fr) | 2000-12-21 | 2000-12-21 | Procede et dispositif associe de memorisation de sous pages teletexte |
FR00/16854 | 2000-12-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002051145A1 true WO2002051145A1 (fr) | 2002-06-27 |
Family
ID=8858065
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2001/003972 WO2002051145A1 (fr) | 2000-12-21 | 2001-12-13 | Procede et dispositif associe de memorisation de sous pages teletexte |
Country Status (4)
Country | Link |
---|---|
US (1) | US20040046892A1 (fr) |
EP (1) | EP1350390A1 (fr) |
FR (1) | FR2818857A1 (fr) |
WO (1) | WO2002051145A1 (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2402289A (en) * | 2003-05-30 | 2004-12-01 | Samsung Electronics Co Ltd | Teletext television with category establishing function to limit displayed pages |
WO2005029856A1 (fr) * | 2003-09-23 | 2005-03-31 | Koninklijke Philips Electronics, N.V. | Systeme et procede de mise en antememoire de teletexte |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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EP0789490A2 (fr) * | 1991-03-15 | 1997-08-13 | EDICO S.r.l. | Récepteur de télétexte amélioré |
WO2000035197A1 (fr) * | 1998-12-05 | 2000-06-15 | Koninklijke Philips Electronics N.V. | Recepteur de television a decodeur de teletexte multipage utilisant un mecanisme de priorite |
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GB2121656B (en) * | 1982-05-14 | 1986-08-20 | Communications Patents Ltd | Communications system |
ES530106A0 (es) * | 1983-03-02 | 1984-11-01 | Philips Nv | Una disposicion para visualizacion simultanea de datos durante un intervalo de tiempo |
GB2197167A (en) * | 1986-10-03 | 1988-05-11 | Philips Electronic Associated | Teletext decoders |
US4931870A (en) * | 1988-03-18 | 1990-06-05 | Rca Licensing Corporation | Rapid access teletext decoder arrangement |
GB2250404A (en) * | 1990-11-30 | 1992-06-03 | Philips Electronic Associated | Teletext decoder scans background memory in reverse order |
DE69211926T2 (de) * | 1991-07-24 | 1997-01-16 | Philips Electronics Nv | Fernsehempfänger mit einem Videotext Decoder |
DE69218902T2 (de) * | 1991-12-18 | 1997-10-16 | Philips Electronics Nv | Mehrseiten-Videotext-Decoder |
GB9200426D0 (en) * | 1992-01-09 | 1992-02-26 | Philips Electronic Associated | Television receiver |
ES2134822T3 (es) * | 1992-04-21 | 1999-10-16 | Koninkl Philips Electronics Nv | Decodificador de teletexto y receptor de television provisto de un decodificador de teletexto. |
EP0578300B2 (fr) * | 1992-06-29 | 2001-05-23 | Koninklijke Philips Electronics N.V. | Récepteur de télévision muni d'un décodeur de télétexte |
US5635987A (en) * | 1993-12-21 | 1997-06-03 | Goldstar Co., Ltd. | Method of an apparatus for displaying teletext information for a wide-screen television receiver |
DE4423232A1 (de) * | 1994-07-02 | 1996-01-04 | Thomson Brandt Gmbh | Verfahren zur Minimierung des Speicheraufwandes für Teletextdaten |
JP2957488B2 (ja) * | 1996-09-09 | 1999-10-04 | 日本電気アイシーマイコンシステム株式会社 | Fm文字多重放送受信機 |
EP0843476A1 (fr) * | 1996-11-19 | 1998-05-20 | Deutsche Thomson-Brandt Gmbh | Méthode de décodeur pour le traitement de données au sein de pages télétexte |
JP4500443B2 (ja) * | 1998-05-22 | 2010-07-14 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | 使用者に興味のあるテレビジョン番組の始まりを自動的に選択し表示するテレビジョン信号処理装置 |
GB9826697D0 (en) * | 1998-12-05 | 1999-01-27 | Philips Electronics Nv | Television receiver |
FR2808956B1 (fr) * | 2000-05-12 | 2002-08-16 | St Microelectronics Sa | Procede et dispositif d'affichage d'un sommaire de pages teletexte |
US20030059200A1 (en) * | 2001-09-25 | 2003-03-27 | Koninklijke Philips Electronics N.V. | Recording and re-insertion of teletext data |
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2000
- 2000-12-21 FR FR0016854A patent/FR2818857A1/fr active Pending
-
2001
- 2001-12-13 WO PCT/FR2001/003972 patent/WO2002051145A1/fr not_active Application Discontinuation
- 2001-12-13 US US10/451,181 patent/US20040046892A1/en not_active Abandoned
- 2001-12-13 EP EP01271751A patent/EP1350390A1/fr not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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EP0789490A2 (fr) * | 1991-03-15 | 1997-08-13 | EDICO S.r.l. | Récepteur de télétexte amélioré |
WO2000035197A1 (fr) * | 1998-12-05 | 2000-06-15 | Koninklijke Philips Electronics N.V. | Recepteur de television a decodeur de teletexte multipage utilisant un mecanisme de priorite |
Non-Patent Citations (1)
Title |
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KINGHORN J R: "NEW MULTIPAGE TELETEXT DECODERS", IEEE TRANSACTIONS ON CONSUMER ELECTRONICS, IEEE INC. NEW YORK, US, vol. 37, no. 3, 1 August 1991 (1991-08-01), pages 441 - 448, XP000263221, ISSN: 0098-3063 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2402289A (en) * | 2003-05-30 | 2004-12-01 | Samsung Electronics Co Ltd | Teletext television with category establishing function to limit displayed pages |
GB2402289B (en) * | 2003-05-30 | 2006-02-15 | Samsung Electronics Co Ltd | Television apparatus with teletext preferred page set establishing function |
WO2005029856A1 (fr) * | 2003-09-23 | 2005-03-31 | Koninklijke Philips Electronics, N.V. | Systeme et procede de mise en antememoire de teletexte |
Also Published As
Publication number | Publication date |
---|---|
US20040046892A1 (en) | 2004-03-11 |
EP1350390A1 (fr) | 2003-10-08 |
FR2818857A1 (fr) | 2002-06-28 |
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