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
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N7/00—Television systems
  • H04N7/025—Systems for the transmission of digital non-picture data, e.g. of text during the active part of a television frame
• • 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
  • H04N7/0888—Subscription systems therefor

Definitions

• the invention relates to a transmission method according to the preamble of patent claim 1 and to a reception method according to the preamble of patent claim 3.
• Methods of this type are known from the British Broadcasting Corporation research report BBC RD 1988/1 from March 1988.
• the object of the invention is to specify a transmission of data signals compatible with the television text specification of ARD / ZDF / DBP in a television signal.
• the aim is to provide a particularly simple, automated possibility for receiving and evaluating the data signals in such a compatible data signal transmission.
• FIG. 2 shows a block diagram of an exemplary embodiment for the transmitter and receiver-side circuit design for carrying out the method according to the invention
• Fig. 3 is a block diagram for the receiver part indicated only in Fig. 2 as a circuit block.
• the teletext probe page shown schematically in FIG. 1 is transmitted non-cyclically in the teletext cycle and consists of a packet of data signals.
• the package length is variable to ensure that it can be adapted to the respective application.
• the length of the data packets is expediently matched to the number of lines available in each television field. This does not always have to be lines in the vertical blanking interval (picture return), although this form of application is the most common. If no part of the picture is encoded in the television signal, practically all lines of each field are available for the transmission of the data signals.
• each special teletext page consists of a packet header of, for example, 24x8 bits and a control and / or user data packet of 40x8 bits, for example.
• the package header is in the first row # 0 of the teletext special page, while the control and / or useful data are divided into rows # 1 to # 23 of the special teletext page.
• the useful data are generated in a data source 1 on the transmitting side and transferred as "data transmission" to an encoder 2, which encodes the useful data in the teletext code.
• the coded data transmission shown as a separate block 3 is formed in the packet formatter 6 into a useful data packet.
• the coding and the packet formation in blocks 2 and 6 are carried out under the control of a control circuit 5, which converts the stipulations regarding the data format of the data packets coming from a control input 4 into corresponding control information for blocks 2 and 6.
• the j i user data packets n generated by the packet formatter 6 are illustrated in FIG. 2 as blocks 8 to 8. 1, a control data packet is added to these useful data packets, which is illustrated as block 9 in FIG. 2 and is generated by a control packet generator 7 under the control of the control circuit 5.
• the user data packets 8 to 8 and the control data packet i are supplied by the packet transmitter 10 to a teletext computer 12 as a teletext special page according to FIG. 1.
• the packets 8 to 8 and 9 contain the packet header and control and user data in the desired format according to FIG. 1
• the non-cyclic data stream emanating from the packet transmitter 10 is mixed by the teletext computer 12 with the cyclic data stream of the "normal" videotext page, indicated as ring magazine 11, ie inserted as a special page between two "normal" teletext pages.
• the teletext computer 12 feeds the teletext data (which now contain the special page according to the invention) to an adding stage 13 in the usual way. which inserts the teletext data into a video signal in accordance with television standards, for example into the lines provided for this in the vertical blanking interval of each field.
• the video signal with the inserted teletext data reaches the receiver 15 via the transmission path 14 (broadband cable connection, optical waveguide connection, terrestrial radio link, satellite radio link), which is indicated as a line, and which is shown in FIG. 3 in FIG individual is shown.
• the transmission path 14 broadband cable connection, optical waveguide connection, terrestrial radio link, satellite radio link
• the TV tuner 159 of the receiver 15 shown in FIG. 3 converts the video / teletext signal, which is transmitted at high frequency, for example, into a baseband signal, from which the teletext part is separated in a teletext data separation stage 154.
• the received teletext data stream at the output of the data separating stage 154 is continuously searched by a teletext page acquisition stage 157 for the occurrence of the teletext special page number preprogrammed on the receiving side. This preprogramming is carried out via a page number input 155, which is connected to a control circuit 153, which in turn is the acquisition stage 157 controls. If the searched teletext special page number occurs in the received yideotext data stream, the special page is decoded and temporarily stored in the teletext page memory 158.
• the temporarily stored teletext special page is examined under the control of the control circuit 153 in an evaluation stage 152 to determine whether it contains a control data packet intended for control on the receiving side and, if so, whether its data transmission key does not match a code preprogrammed on the receiving side. This last-mentioned preprogramming takes place via an identifier input 156, which is connected to the control circuit 153.
• the temporarily stored teletext special page and possibly all the special teletext pages subsequently received under the same teletext special page number are processed in the evaluation stage and decoded in the downstream decoder 151.
• the resulting data signal corresponds to the
• Data transmission at the output of data source 1 (Fig. 1).
• This data signal can e.g. stored and processed on a personal computer.

Landscapes

• Engineering & Computer Science (AREA)
• Multimedia (AREA)
• Signal Processing (AREA)
• Television Systems (AREA)
• Radar Systems Or Details Thereof (AREA)
• Cosmetics (AREA)
• Compositions Of Macromolecular Compounds (AREA)
• Polymerisation Methods In General (AREA)
• Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
• Networks Using Active Elements (AREA)
• Color Television Systems (AREA)
• Alarm Systems (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6387010

Family Applications (1)

Country Status (12)

Cited By (4)

Citations (2)

Family Cites Families (1)

• 1989
  • 1989-08-12 DE DE3926685A patent/DE3926685A1/de active Granted
• 1990
  • 1990-08-10 JP JP51213190A patent/JP3370665B2/ja not_active Expired - Fee Related
  • 1990-08-10 WO PCT/EP1990/001323 patent/WO1991003127A1/de not_active Ceased
  • 1990-08-10 AU AU62978/90A patent/AU6297890A/en not_active Abandoned
  • 1990-08-10 AT AT90913136T patent/ATE116087T1/de not_active IP Right Cessation
  • 1990-08-10 KR KR1019920700310A patent/KR0166382B1/ko not_active Expired - Fee Related
  • 1990-08-10 CA CA002059552A patent/CA2059552A1/en not_active Abandoned
  • 1990-08-10 DE DE59008095T patent/DE59008095D1/de not_active Expired - Lifetime
  • 1990-08-10 HU HU92376A patent/HUT63286A/hu unknown
  • 1990-08-10 EP EP90913136A patent/EP0486607B1/de not_active Expired - Lifetime
  • 1990-08-10 DD DD90343375A patent/DD297291A5/de not_active IP Right Cessation
  • 1990-08-10 FI FI920572A patent/FI920572A7/fi unknown
• 1996
  • 1996-01-18 HK HK8096A patent/HK8096A/xx not_active IP Right Cessation

Patent Citations (2)

Non-Patent Citations (4)

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