FI107679B - A method for receiving repetitive teletext data in one or more cycles - Google Patents

Abstract

In order to receive cyclically repeated teletext data, the latter are separated from the television signal, the data belonging to a teletext page are collected and the teletext pages which are combined to form 100-page magazines are placed in a buffer store. Here a base TOP table transmitted as a separate teletext page indicates which teletext pages have actually been transmitted. Depending on the evaluation of the base TOP table, a desired teletext page is sought only if its existence is indicated by the base TOP table. If two or more magazines are transmitted in parallel as separate cycles in the same television signal, an additional list is evaluated which is contained in the base TOP table of a magazine having such a table. This additional list gives in coded form the number and serial numbering of the maximum possible magazines and their mutual association, with any shared base TOP table. The list is evaluated by establishing how many magazines can be received at a given time and whether, and which, magazines are included in a shared base TOP table.

Description

107679

The invention relates to a method according to the preamble of claim 1. The invention relates to a method according to the preamble of claim 1. The invention relates to a method of receiving teletext data repeated in one or more cycles. Such a method is known from EP 0 264 565 B1.

In the so-called TOP of the Table method, as is known from EP 0 264 565 B1, a teletext section transmits a so-called "basic TOP table" as a special page containing information about the 10 teletext pages currently contained in the section. Based on this basic TOP list, the receiver has reliable information as to whether the episode contains the teletext page desired by the user, so that unnecessary waiting can be avoided.

In order for the teletext pages of different teletext subscribers or teletext sources, or magazines with 100 teletext pages in each case, to be transmitted as a combined television signal, there is a possibility of either serial or parallel use. In the mixed mode applicable in the Federal Republic of Germany, the teletext pages of various teletext sources are compiled before being broadcast by the combiner and attached to the television signal in question. The connector makes a new basic; TOP table as it forms a new teletext episode.

• · · • ·: 20 In parallel use, for example in the United Kingdom, magazines of different teletext sources are transmitted during the vertical shutdown period of the various lines corresponding to the television signal in question. In order to be able to use the TOP method also, each magazine must have a special basic TOP table for each magazine. To form an overall view of the pages of the received magazines or teletext episodes, a teletext decoder. you should look at the basic TOP table in each magazine, which would take a lot of time.

It is therefore an object of the invention to enable a decoder to produce a fast * · * ·. an overview of all teletext pages transmitted, including for simultaneous use by different teletext providers • · - 30.

* · · • · · • · ·. ···. This object is solved by the features of claim 1 according to the invention.

2 107679

Advantageous embodiments and variations of the method of the invention are apparent from the dependent claims.

The invention will be explained in more detail with reference to the drawing, in which: Figure 1 shows an example of a basic TOP table for eight magazines, each having 100 teletext pages; Fig. 2 is an enlarged view of a portion of row 23 of the peras TOP table of Fig. 1, in which a list of basic TOP tables of various magazines is written; Figure 3 shows a code table for encoding the list of Figure 2; and Fig. 4 shows an example according to the coding table of Fig. 3, Fig. 10 is a list according to Fig. 2.

Figure 1 shows a standard basic TOP table, broadcast as a special page at a convenient point in a teletext episode, containing information on all teletext pages currently broadcast by one or more magazines containing 100 teletext pages. The table has a fixed position for each page using 15 coordinate systems (row address, column address). In addition, rows 21 and 22 of the basic TOP table have ten fields, Nos. 1 to 10, that include a list of page numbers that contain information about multiple pages and more. T: Information regarding the pages of that magazine or magazines.

The invention proceeds from the basic TOP table of Fig. 1 modified by the above-mentioned parallel operation in which two or more teletext sources of different teletext sources are transmitted on the same television signal, as shown in line 23 of Figure 2.

• · · • · ♦ «· ·«

According to the invention, a list of all the basic TOP tables of magazines moved during the period is moved in line 23, columns 32-39 (which are free in Figure 1). These "basic TOP tables list", hereinafter briefly referred to as the Y * "list", indicates which magazines Nos. 1 to 8 contain teletext pages, «.. * · * and which basic TOP tables or tables of those basic magazines TOP-: ***: data is being sent. Each teletext casino is then assigned a fixed · · · column of "list". The contents of the "list" may be encoded according to the code table of Fig. 3. Accordingly, up to eight teletext broadcasts are coded in sequential numbers from 1 to 8. Special codes "C" and "D" are reserved for TOP 3 107679 list or free magazines. Six other codes are reserved for future variations.

Fig. 4 shows, by way of example, information written in a "list". In this example, it is assumed that the teletext service provider transmits magazines # 1, 2, and 3 in parallel operation 5 to combine the basic TOP information of the magazines # 1, 2, and 3 into the same basic TOP table that is broadcast in magazine # 1. To this end, columns 32, 33 and 34 reserved for magazines # 1, 2 and 3 indicate with the code "1" that the relevant basic TOP table is being sent in magazine # 1.

10 The example further assumes that magazines Nos. 4 and 5 are reserved by another teletext service provider. Also, a single basic TOP table is provided for these magazines, which is moved to Magazine No. 4. , which indicates that the relevant basic TOP table will be sent in magazine # 4.

15 In addition, it is to be assumed that the sixth and seventh teletext casinos are free. As a result, in columns 37 and 38, the code "D" (= magazine is free) is sent.

Finally, it is assumed that Magazine # 8 is booked by a teletext service provider that does not provide any basic TOP information. Therefore, column "C" (= magazine without TOP) is inserted in column 39.

• · · • ·: A television receiver equipped with a teletext decoder retrieves an automatic page # 100 during formatting, displays the contents of the page (usually in the overview -: * ·]), and receives the basic TOP-

·· ♦ table with page # 1F0 in the hexadecimal system. This peras-TOP

• After receiving the M * table, it examines the "list" of Figure 25 4 in line 23 of this table. From here, it sees that the received TV signal has. three teletext providers, the first offering three teletext magazines, the second offering two teletext magazines, and the third one a teletext casino. In addition, it sees that the first provider's mains // 1, casinos # 1, 2 and 3 are combined to share a common basic TOP table in mains # 1. It also sees that the two teletext casinos of the second teletext provider common basic TOP table and that they are moved on page 4F0. In addition, the receiver sees that teletext magazines # 6 and 7 do not broadcast any teletext pages, so that it can respond immediately and without waiting time with a corresponding error message 4 107679 in response to a corresponding page request from the user. Finally, the receiver sees that the third provider sends only the single magazine # 8 without any other TOP information.

Based on the above information, the teletext decoder can, in the shortest possible time, form a complete picture of the teletext information transmitted on the television signal in question. On the other hand, with a perfect image, it is able to load its page memory in the background on pages where the decoder assumes that the user prefers to make a choice. On the other hand, the decoder can react as quickly as possible to the user's wishes and, in particular, promptly provide the user with an error message when the desired pages do not exist.

· • 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 · · M M M M M M M M M M M 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

Claims (4)

1. menetelmä yhdessä tai useammassa jaksossa toistuvan, televisiosignaaliin sisältyvän tekstitelevisiodatan vastaanottamiseksi, jossa tekstitelevisiodata televisio-signaalista erotettuna, kulloinkin tekstitelevisiosivuun kuuluva data koottuna yes fun-5 loinkin 100 sivua sisältävinä yhdistettyinä makasiineina välivarastoidaan, yes jossa arvioidaan ainakin yhtä, jossakin makasiinissa erityisenä tekstitelevisiosivuna lähetettyä perus -TOP-taulukkoa, joka osoittaa mitkä textitelevisiosivut todella ovat läsnä, jolloin perus-TOP-taulukon arviointia vastaten haetaan toivottu textitelevisiosi-vu vain silloin, only perus-TOP-taulukko ilmaäettä siäettä makasiineja kulloisenakin erityis-jaksona samassa televisiosignaalissa secä läettettäessä yksi, kaksi tai useampia pe-rus-TOP-taulukoita, joissa kulloinkin osoitetaan makasiini tai makasiiniryhmä - arvioidaan lisäluettelo, joka sis OP-taulukkoon, ja joka koodatussa muodossa osoittaa 15 (a) käsillä olevien makasiinien lukumäärän ja numeroinnin makasiinien enimmäislu-kumäärän puitteissa; b. yes c) makasiinin tai makasiinien numero (t), jossa liittyvä perus-TOP-taulukko ... (-taulukot) lahetetään, • «· L: ': 20 jolloin lisäluettelon arviointi johtaa siihen, eenä meritetitetän kuinka monta ja mitkat: fastaanotettavissa, ja mikäli vastaanotettavissa olevat makasiinit on • · · · '· 1: yhdistetty muihin - yes mahdollisesti mihin - vastaanotettaviin makasiineihin yhtei- • ·.:. sexi perus-TOP taulukoxy. ♦ ··· ··· * · 1: 2. Patent Tivaatimuksen 1 mukainen menetelmä, tunnettu siitä, että luettelo lisäksi 25 osoittaa mihin makasiineihin ei kuulu perus-TOP-taulukkoa. • · .1 ··. 3. Patenttivaatimuksen 1 tai 2 mukainen menetelmä, tunnettu siitä, että luettelo. 2 'lisäksi osoittaa mitä makasiineja ei lahetetä makasiinien enimmäislukumäärän puitteissä. ··· · · · · · · · · · · · · · · · · · · · · 2 · 6 107679 1. A method for receiving teletext data contained in a television signal and repeated in one or more cycles, in which the teletext data is separated from the television signal, data related to each teletext page is collected, and the teletext pages collected into magazines on each 100 pages, intermediate storage and at which at least one base TOP table, which is transmitted in a magazine in the form of a particular teletext page, is scanned to determine which teletext pages actually exist, whereby, in accordance with the scan of the base TOP table, a selected teletext page only - if its presence is indicated by the base TOP table, characterized in that in parallel transmission of two or more magazines each in the form of a separate cycle in the same television signal as in the transmission of one, two or more base TOP table ( er) each correlated to a magazine or to a group of magazines a supplement list is searched, which is contained in a base TOP table and which is in coded form indicates (a) the number and numbering of the predicted maximum number of trays; (b) the relationship (s) between the base TOP table (s) and the various trays; and (c) the number (s) of the respective table. those magazines where the related base TOP table (s) are superimposed, M1: where the scan of the supplement list is performed to determine how many and which j, | · 20 magazines that can be received and whether the receivable magazines can be closed; Γ: together with other receivable magazines - and in any case possibly with which - into a: * · *: common base TOP table. A method according to claim 1, characterized in that the list further indicates to "4 in *" which magazines no base TOP table is related. 25 Method according to claim 1 or 2, characterized in that the list further. ·· ·. Specifies which magazines in the maximum predicted number of magazines are not sent. ··· 4 • M «• Ml • M • * • · • M • * * • · · Ml • * • ♦ • M