Television – Diverse device controlled by information embedded in video...
Patent
1992-04-07
1996-09-03
Harvey, David E.
Television
Diverse device controlled by information embedded in video...
348467, 348478, 348906, 358335, H04N 708
Patent
active
055528333
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a transmission system and a receiver for, on the transmission side, transmitting television-program table information such as channel information, date information, time information, program code information, and title information using teletext of the coding transmission system and, meanwhile on the reception side, reserving a video recording on image recording/reproducing apparatus using the received television-program table information.
BACKGROUND OF THE INVENTION
In recent years, a teletext of coding transmission system has come into practical use that allows character and graphic information such as news, weather forecasts, and stock market, which are provided by combinations of characters and graphics, to be presented on a screen of a household television receiver. Also, there have been developed television receivers with a built-in receiver for receiving teletext in a coding transmission system. Hereinbelow, the teletext and its teletext receiver equipment in a coding transmission system as described above are explained with reference to the drawings.
FIG. 1 shows a construction of a conventional teletext receiver. In the figure, represented by reference character a is a television video signal; so by numeral 1 is a character signal extracting section for extracting character signals superimposed on the vertical blanking intervals from the video signal a; 2 is a data block linking section for linking the character signals in the units of data blocks extracted by the character signal extracting section 1 and classifying them into data groups; 3 is a data type deciding section for deciding whether the data groups classified by the data block linking section 2 are program data, page data, or index data; 4 is a character-program data decoder section for decoding character-program data according to the types of data decided by the data type deciding section 3 to develop the data into characters and graphics for display; 5 is a buffer memory section for accumulating the signals decided as character-program data by the data type deciding section 3; 6 is a display control section for actually displaying display data developed into characters and graphics at the character-program data decoder section 4 on a screen or the like; 7 is a video memory section for storing display data to be actually displayed on the screen or the like by the display control section 6; and 8 is a sound generator section for performing actual sound generation according to added sound data decoded by the character-program data decoder section 4.
FIG. 2 shows the hierarchy of a teletext signal of the coding transmission system. In the FIG. 2, hierarchy 1 is a physical layer, representing the item elements of a character signal as an electrophysical signal. This signal is also superimposed on 14H, 15H, 16H, and 21H of the vertical blanking interval of the television signal. At a link layer of a hierarchy 2, the character signal is treated as logical data of either 1 or 0. Data lines, each of which refers to a transmission unit of character signals transmitted during one horizontal scanning line interval of a television video signal, is composed of a synchronization part and a data packet. The data packet, which refers to a part of the data line in which the synchronization part is eliminated, is composed of a prefix, data blocks, and check codes. Primarily the function of prefix is exerted at hierarchy 3 of a network layer. The prefix refers to data for identification and control, added to the head of the data packet, while the data blocks refer to a part of the data packet in which the prefix and the check code are eliminated, for transmitting various types of information data. Hierarchy 4 is a transport layer, representing the functions of data groups. The data groups are composed of data groups, each being one group of information data transmitted by one data block or a plurality of data blocks. Hierarchy 5 is a session layer, representing the structure of program data and functio
REFERENCES:
patent: 4337485 (1982-06-01), Chambers
patent: 5038211 (1991-08-01), Hallenbeck
European Broadcasting Union, "Specification of the Domestic Video Programme Delivery Control System (PDC)", Tech. 3262-E, pp. 3-44, (Aug. 1990).
"TOP macht Fernsehtext benutzerfreundlich", NTZ Nachrichtentechnische Zeitschrift, vol. 42, No. 11, pp. 724-727 (Nov. 30, 1989).
R. Huschke et al., "Vom Ferneher zum Info-Terminal", Funkschau, vol. 61, No. 13, pp. 55-58 (Jun. 16, 1989).
E. G. Breeze, "Television Line 21 Encoded Information and its Impact on Receiver Design", IEEE Transactions on Broadcast and Television Receivers, vol. BTR-18, No. 4, pp. 234-237 (Nov. 1972).
Henmi Hidemi
Nakahigashi Hideto
Sakamoto Ken
Takano Shigeru
Harvey David E.
Matsushita Electric - Industrial Co., Ltd.
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