Classifications

• • 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 invention relates to a method according to the preamble of claim 1. Such a method is known from DE-OS 34 23 846.
• DE-OS 34 23 846 For the reception of teletext data, it is known from DE-OS 34 23 846 to separate the teletext data transmitted in the television signal and, after collecting teletext data, to buffer them in a page memory. With a buffer of low capacity, for example for four or eight pages, only certain pages previously selected by the user are buffered. Alternatively, based on the page currently selected by the user, the numbers of the following three or seven pages in the cycle are searched; the pages found are temporarily stored in the area provided for this to be used by the user without waiting. Pressing a "+" key can be called up.
• the object of the invention is to improve a method of the type mentioned in such a way that the user is not irritated when searching the "next" pages, without a much higher memory and processing effort being required on the decoder side.
• Fig. 2 shows a sequence of page numbers that can be selected from a currently selected page by pressing special selection buttons
• Fig. 3 is a block diagram of a teletext receiver working according to the inventive method.
• FIG. 4 shows a schematic illustration of an extension of the exemplary embodiment according to FIG. 1 with a plurality of separate teletext pages separated for page numbers, sub-pages (multiple pages) numbers and page titles
• FIG. 5 shows a schematic view of a television receiver on which the according to the exemplary embodiment according to FIG. 4 won titles are displayed for user guidance.
• Fig. 1 the content of a separate teletext page is illustrated, which is occasionally transmitted in the cycle and is automatically selected and read in the receiver-side teletext decoder.
• the numbers of the pages occurring in a teletext cycle or cycle section are listed continuously in a table consisting of 40 columns and 20 rows.
• the page numbers # 410, # 430, # 440, # 500 are marked with a jump identifier "/", these marked pages being the first page of a group of pages that belong together in terms of content, for example program information pages for one particular display the calendar day.
• page # 440 is a multiple page, consisting of pages # 440/1 and # 440/2, in contrast to the other pages of the example case considered, it is not marked with the jump identifier "/" but with the jump identifier "B".
• the following grouping order applies:
• the group-by-group assignment makes it possible either to "page through” within a group of program information pages by pressing a "Next page” key or to directly select the first page of the next group by pressing a "Jump” key.
• FIG. 3 shows a block diagram of a teletext receiver which works according to the method according to the invention.
• the teletext data are separated from the video signal in a separation stage 10 and put together into individual pages.
• Each page is fed via the output line 11 to a gate circuit 30, which feeds the supplied page to the page buffer 40 via a reading line 31 if a control circuit 50 to be explained in more detail supplies an enable signal to the gate circuit 30 on an output line 51.
• the control circuit 50 effects an addressing of the page buffer 40 for the read-in process via a further output line 52.
• the reading process of the page buffer 40 also takes place under the control of the control circuit 50 via a third output line 53.
• the control circuit 50 are connected via a line 21 from a page number extraction circuit 20 Page number of the teletext pages appearing on the line.
• the decoupling circuit 20 detects the number of each teletext page fed from line 11 via a branch line 12.
• the control circuit 50 is connected to the input 70 operated by the user, which has a keyboard 71 for entering the desired page number, a key 72 labeled "next page” and a further key 74 with "jump".
• the desired page number is supplied to the control device via a line 711, while the command “next page” or “jump” is sent to the control circuit 50 via line 721 or 741.
• the separate page arrives with the data for the page numbers which occur in the cycle or cycle section, it is automatically fed to the page buffer 40.
• the data on this page are transmitted to the controller 50 via the data reading device 54, the page numbers are determined and stored in a page number memory 60, which is connected to the control circuit 50 via a bidirectional bus 61.
• the control circuit 50 determines - starting from the currently selected page number - the next following page number in the page number memory 60, namely the page 4T0 (see also FIGS. 1 and 2). As soon as this side occurs in the cycle, which is communicated to the control circuit 50 by the decoupling circuit, an enable signal for the appears on the output line 51 Gate circuit 30, whereupon the page 410 is stored via the line 31 in the storage space number 1 of the page buffer 40. As already mentioned, addressing to memory location number 1 takes place under the control of control circuit 50 via output line 52.
• control circuit 50 After reading in, control circuit 50 generates a read command for memory location number 1 via output line 53, which is followed by page with number 410 is read out via the bus 41 from the page buffer 40 to a processor 73 which represents the page number 100 as a video signal with the components R, G, B and S, for example on the screen of a television receiver.
• the control circuit 50 furthermore, after user request for page number 410, automatically occupies the remaining memory locations number 2, number 3 and number 4 of the page buffer 40 with the following pages, corresponding to the page number memory.
• page number 411 is found in page number memory 60 and consequently, in the manner already described, it is buffered in memory location number 2 after its occurrence in the cycle. The same procedure is followed on the next pages.
• the control circuit 50 Each time the user "turns” by pressing the button 72, the control circuit 50 reads out the next memory location, which is occupied by the content of the "next" page due to the reading process described above. This ensures that the user can "turn the page” quickly. In the event that the user "turns” so quickly that the relevant next page in the cycle has not yet occurred in the cycle and is stored in the page buffer 40, the control circuit 50 can actuate a display 73 on the input 70 via a line 54 which prompts the user to wait.
• so-called multiple pages can also be more easily buffered and read out.
• the control circuit 50 knows from the page number memory 60 whether and if so how many multiple pages are present in the cycle and can accordingly influence the search and loading process for the page buffer 40 in such a way that all seldom of a multiple page set are temporarily buffered.
• the control circuit 50 determines - starting from the currently selected page number - the next page number in the page number memory 60, that is with a jump identifier is provided. If the page in question does not yet exist in the page buffer 40, this page is written into the rare buffer 40 as soon as it occurs in the cycle. After reading in, the page is displayed on the screen.
• the remaining pages of the page buffer 40 are automatically assigned the following pages, corresponding to the page number memory 60.
• the capacity of the soenzw i schenspe i chers 40 z. B. 4 or 8 pages opti ma l uses and the user gets the opportunity to "page through" in the pages of a teletext cycle or section, similar to a magazine, with the shortest waiting time.
• a press on the "jump” button can be used to select the first page of a group of related pages directly.
• the rarities of a group can be selected one after the other.
• FIG. 4 An extension of the exemplary embodiment according to FIG. 1 is illustrated with reference to FIG. 4.
• a separate teletext page is used to mark all pages in the teletext cycle or cycle section with identifiers.
• a further jump identifier is used for a subject area with several groups that are related in terms of content. Additional identifiers are provided for subtitles and program information pages.
• a second teletext page contains markings for all currently sent multiple pages with special identifiers for the number of subordinates.
• Another teletext page is used for additional information, e.g. for titles or special codes with which the corresponding pages can be selected directly without knowing the rare number.
• FIG. 5 shows an example of how titles from the additional information table for user guidance can be displayed on the screen by the decoder.
• the information line on the left shows the area "ARD", to which the currently selected page "ARD program - today” belongs. Besides the next group “Program - tomorrow" is displayed, which can be reached with the jump button.
• the next area "Program preview - ZDF" is specified, which can be accessed directly by pressing the corresponding "area button".

Landscapes

• Engineering & Computer Science (AREA)
• Multimedia (AREA)
• Signal Processing (AREA)
• Television Systems (AREA)
• Compounds Of Unknown Constitution (AREA)
• Bakery Products And Manufacturing Methods Therefor (AREA)
• Radiation-Therapy Devices (AREA)
• Circuits Of Receivers In General (AREA)

Priority Applications (4)

Applications Claiming Priority (4)

Publications (2)

Family

ID=25848396

Family Applications (1)

Country Status (5)

Cited By (2)

Citations (4)

• 1987
  • 1987-08-14 AT AT87111790T patent/ATE69531T1/de not_active IP Right Cessation
  • 1987-10-08 WO PCT/EP1987/000586 patent/WO1988002973A2/de active IP Right Grant
  • 1987-10-08 JP JP63500898A patent/JPH0767168B2/ja not_active Expired - Lifetime
• 1988
  • 1988-06-10 DK DK315588A patent/DK167725B1/da not_active IP Right Cessation
  • 1988-06-10 FI FI882775A patent/FI87293C/fi not_active IP Right Cessation

Patent Citations (4)

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