Television – Special applications – Observation of or from a specific location
Patent
1996-10-23
1998-12-29
Kostak, Victor R.
Television
Special applications
Observation of or from a specific location
348221, 348722, H04N 718
Patent
active
058546545
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns a system for high frequency transmission of television shots and more particularly a high frequency (HF) wireless television image transmission system of a quality at least equal to that prescribed by prevailing standards in television networks and allowing several mobile cameras to be connected to one production station, such as a mobile production unit, in order to allow a television program to be made with a view to the live broadcasting and/or recording thereof. Moreover, the system may be completely mobile. Such a system is disclosed for example in American patent U.S. Pat. No. 4,091,422.
There is known from the article "Portable television shot equipment" by J. Cayzac, ACTA Electronica, vol. 11, no. 4, October 1968, pages 352-360 a wireless image transmission system comprising, on the one hand, several shooting units each including a camera and a module comprising a radio wave receiver and a high frequency transmitter able to transmit via radio waves a shot signal provided by said camera to a central production unit capable of communicating with a broadcasting network to broadcast live and/or to record at least one of said signals and, on the other hand, at least two hertzian video channels each allowing the transmission on a predetermined carrier frequency of a video signal representing a predetermined number of images per second, said channels connecting said shooting units to the central production unit.
In such systems known from the prior art, an operator controls the operation of a camera. The shot is transmitted via a hertzian video channel on a transmission frequency made available by the granting authority to a reception point, for example a mobile production unit where the producer of the television program to be broadcast live and/or recorded is situated. In his mobile unit, the producer receives several video signals corresponding to the shots from the various cameras on monitors. He may choose at any moment the video signal or signals to be broadcast live and/or recorded. Since his choice is based on the different images displayed on the monitors, it is desirable for the producer to have the greatest possible number of images available, and preferably those from all the cameras used, so as to have a global vision of events and so as to always be able to choose, from among the video signals corresponding to said shots from the various cameras, the most interesting video signal or signals to be broadcast live and/or recorded. Each camera then needs its own hertzian video channel which, in the event that the live broadcasting or recording quality has to conform with television network standards, must have a passband of 6 to 8 MHz.
It is known that the high frequency bands able to be used for this type of transmission are already very heavily loaded so that the granting authority can only reserve very few frequencies for each transmission system.
In the event that the desired number of cameras is higher than the allotted number of frequencies, it is obvious that numerous additional operations are necessary. Moreover, since each camera does not therefore have its own hertzian video channel available for transmitting its shots, this method of working of course does not allow simultaneous use and display of all the shots from the various cameras in the mobile production unit where the producer is situated. The producer thus loses any global vision of events, which constitutes an enormous handicap for him. These additional operations may thus lead to overworking, loss of data, etc . . .
There is also known from American patent U.S. Pat. No. 4,943,854 a video surveillance system which allows multiplexing of the various images provided by the shooting units. However, here the quality of the images is not very important, since it is sufficient to recognise the places monitored, and the image change speed is generally relatively low in comparison with a live broadcast. Furthermore, this patent makes no mention of the possibility of transmitting the images via radio wav
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Schaffer Rudolf
Zwahlen Laurent
Zwahlen Milva
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