Television – Format – Including additional information
Patent
1998-07-02
2000-04-25
Lee, Michael H.
Television
Format
Including additional information
348476, 348477, H04N 708
Patent
active
060550201
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a method of transmitting additional data in television frames, as well as to a transmitting device, a receiving device, and a system for carrying out the method. Methods and equipment are known for audio data, for example, from Gassmann/Eckert: "Das COM-System" [The COM System],Funkschau 1970, no. 20, pages 689-692 and no. 21, pages 749-750, and for video data from Langenkamp/Lowy: "Megatext-IC fur Videotext und Grafik" [Megatext IC for video text and graphics], RFE1994, no. 7, pages 18-20.
The properties of the FBAS signal (color, video, sweep and synchronization signal) leave open the possibility of superpositioning other information-carrying signals (additional data) without interfering with reception of the television broadcast program. Although most publications are concerned with only one type of additional data, the transmission of several additional test signals and data signals is described, for example, by Rudolf Meusel: Fernsehtechnik [Television Technology], Huttig 1991, on pages 210-227 in chapter 9. The additional data are transmitted at the highest possible transmission rate and with a high transmission reliability.
Although radio satellite technology has permitted reception of an ever increasing number of television programs, local program providers offer no possibility of regional services because of the large coverage zones and high cost. However, broad-band communication networks are not suitable for portable equipment and reception sites at great distances. The terrestrial transmitter network infrastructure already contains test lines and video text, mainly in the video-free lines. Additional wireless services have often failed because of the shortage of frequencies and the high cost of television studios. German Published Application DE-OS 25 16 742 discloses a television system with which digitized audio signals are transmitted during the back porch period. To be able to transmit a higher data rate, the respective FBAS signal is modified so that the back porch is lengthened at the expense of the duration of the horizontal synchronizing pulse. The modified FBAS signal and the digitized audio signals are sent to an adder that inserts the digitized audio signal into the lengthened back porch.
German Published Application DE-OS 31 03 406 discloses a method of transmitting digitized audio signals in the horizontal blanking interval of a video signal. However, this prior art document does not address the problem of making the color and/or video signal-free intervals of an FBAS signal optimally available for the transmission of additional data.
German Published Application DE-OS 37 32 111 discloses a method of adjusting the propagation time of video and audio signals to a reference signal. According to the known method, before the video signal is entered into the memory of a video synchronizer, the audio signal is inserted into the blanking intervals of the video signal. The video and audio signals are processed simultaneously in the memory of the video synchronizer. After triggering the processed signal, the audio signal inserted is separated from the video signal again. This document also does not address the problem of being able to better utilize the color and/or video signal-free intervals of the FBAS signal for transmission of additional data.
German Published Application DE-OS 29 01 034 discloses a method and a circuit arrangement for compressing and decompressing analog signals in digital form. The compressed digital signals are, in fact, inserted into the free information intervals of video signals or transmitted instead of television signals. However, this document does not contain any references or suggestions indicating how the color and/or video signal-free intervals of an FBAS signal can be utilized better for the transmission of additional data.
The object of present invention is to utilize the unused channel capacity of the television channel even more optimally and thus ensure a high transmission reliability, high tran
REFERENCES:
patent: 3576391 (1971-04-01), Houghton
patent: 3927250 (1975-12-01), Rainger
patent: 3982064 (1976-09-01), Barnaby
Finger Adolf
Gotting Oliver
Hiller Hartmut
Lorenz Rudolf Werner
Poegel Frank
Deutsche Telekom AG
Lee Michael H.
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