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Meaning [words]: TV broadcast truck [phonetic]: dià n shì zhuǎn bŠchē [Interpretation]: Car with television broadcast equipment. Used for live broadcasts. With camera, editing and other functions. The equipment can also be moved to the site for filming. The signal will be sent to the TV station for broadcast using microwave equipment.
Introduction TV OB van is a small-sized "TV station" equipped with features such as flexibility and wide range of activities. It can carry out live video recording and live editing work away from the TV center, and can instantly transmit the recorded program to the TV center for live broadcast. In the late 1930s, France produced its first television OB van. After decades of development, it has been widely adopted by all countries in the world.
Equipment camera The camera on the car is equipped with different production requirements. According to the director's intentions, the cameras are placed in different locations on the scene. The TV signal output by the camera is sent to the OB van via cable. Video switcher With multi-channel TV signal input and one or more outputs, it is possible to perform multi-level picture stunt combinations on two or more video signals for selective switching by the director. Microwave emission equipment The signal output by the switcher is sent through the cable to a microwave transmitter set up on a high ground. After the microwave transmitter modulates the TV signal, the microwave is transmitted by the microwave transmitting antenna directly to the microwave receiving equipment on the roof of the TV center. The demodulated signal is sent to the television broadcasting center. VCR The switched output signal is also sent to the recorder, which can record the program continuously and perform various on-site editing tasks. The slow-motion control box equipped in the broadcast of sports programs can be used to remotely control the recorder for slow-motion playback. Synchronizer Various timing and reference signals are generated so that the scanning systems of the television devices work synchronously. Audio equipment Including microphones, mixers, tape recorders, audio jacks, audio distributors and so on. The sound of the live program is converted into an electric signal by a microphone, then sent to the OB Vehicle through the audio cable, and then sent to the VCR, microwave transmitter and monitor speaker through the audio jack board and audio distributor. monitoring system Each camera is equipped with a monitor on the car for the director's selection screen and technicians to monitor the technical quality. Call system During the production of the program, in order to ensure that the director of the command and the coordination of the work of various positions, must be equipped with a dedicated wired and wireless call system. Power supply air-conditioning system power supply system It is generally powered by an external mains and a generator built into the car. The air conditioning system must ensure the working conditions and equipment stability in the vehicle.
Development With the development of electronic technology and computer technology, the equipment of modern television OB vehicles is increasingly perfect and their functions are increasing. More and more cameras use microcomputer control and fully automated adjustments, and can adjust multiple cameras at once through a centralized control unit. The use of these technologies has greatly enhanced the ability of television broadcasters to produce programs.
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