The TV OB van, often referred to as the mobile studio of an event, plays a crucial role in high-end television production. It is essentially a self-contained broadcasting unit equipped with a wide range of professional tools that allow for seamless integration of recording, editing, and live broadcasting. This makes it possible to produce quality television programs from almost any location outside of a traditional studio. As a result, the TV OB van is also commonly known as a "TV carrier" in the industry. Just like an aircraft carrier serves as a mobile base for military operations, a TV OB van acts as a flexible and powerful platform for television production.
According to the broadcast television dictionary, live broadcasting refers to the process of producing and transmitting a program in real-time, as events unfold on-site. It can be further categorized into two types: live broadcasts and studio-based live broadcasts. A field live broadcast specifically involves capturing and transmitting content simultaneously as the event occurs, fully showcasing the strengths of broadcast media. In contrast, broadcasting typically involves the transmission of pre-recorded or live content from one station to another, either in real-time or delayed.
When designing a TV OB van system, security is a top priority. The system must be built to be foolproof, ensuring that even in the face of unexpected issues, the broadcast remains uninterrupted. To achieve this, the system’s safety and reliability are composed of three main elements: the reliability of the control system, the stability of the equipment, and the effectiveness of the emergency backup system. Therefore, not only should the most reliable equipment be selected, but the total number of devices should also be kept to a minimum to reduce potential failure points.
To address potential system bottlenecks, several strategies are employed. First, redundancy is introduced by configuring a matrix-based emergency switching system with multiple backup channels. Second, bypass mechanisms are used where applicable, ensuring compatibility during device selection. Third, jumpers are integrated into the system as a final line of defense for emergency situations. Additionally, every single point of failure must have a corresponding contingency plan. All primary channel devices are equipped with dual power supplies, and all emergency procedures can be initiated with a single click.
Traditional TV OB vans often use a backup switcher combined with a matrix for emergency switching. While this method is simple and logically clear, it has limitations. For example, when switching to the backup system, auxiliary systems such as TALLY need to be manually adjusted. Moreover, the main switcher may lack certain advanced features like special effects, and its cost can be quite high due to the need for extensive options and matrices.
However, when the switcher and matrix operate under the same control protocol, they can be jointly controlled, which significantly improves the system's flexibility and efficiency. When both components exist within the same system, the challenge lies in managing the TALLY relationship between them—ensuring that the source signal is accurately identified as it passes through multiple devices. This is where virtual matrix technology comes into play. By establishing a virtual matrix, each connection in the system becomes unique, allowing for precise control over signal routing. This simplifies complex configurations and enables functions like synchronized video and audio matrix operations and centralized TALLY management.
With virtual matrix technology, it's possible to apply the same matrix across different systems or assign different matrices to the same system, thereby increasing the availability of resources. This leads to an intelligent, networked, and diversified control system that integrates switches and matrices seamlessly. As a result, the system can support a unified naming convention for all sources, enhancing operational efficiency. Companies like Sony and Thomson have successfully implemented dynamic intelligent TALLY systems that follow the source name throughout the entire TV OB van system.
The implementation of a dual-switching station in a three-channel TV OB system is made possible by the successful application of virtual matrix theory. This allows for the logical connection of multiple cross-point devices, leading to a more efficient and scalable system configuration. Some domestic TV stations have already adopted this structure in their studio and OB van designs. In this setup, the main switcher is responsible for general signal switching, while the auxiliary switcher handles specialized effects and outputs. This division of roles reduces the need for expensive features on the main switcher and allows the auxiliary switcher to perform tasks like single-sided output while applying effects. During emergencies, the system's ability to continue production is significantly improved. The key advantage of this structure is the separation of handover guidance and special effects production, maximizing the system's utilization during normal operation.
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Water Pump is a machine that transports liquids or pressurizes liquids. It is mainly used to transport liquids including water, oil, acid alkali, emulsion, suspension emulsion and liquid metal, etc. It can also transport liquids, gas mixtures and liquids containing suspended solids. It transfers the mechanical energy or other external energy of the prime mover to the liquid, so that the liquid energy increases. According to different working principles, it can be divided into positive displacement pumps, vane pumps and other types. Positive displacement pump is the use of its studio volume changes to transfer energy; Vane pump is the use of rotary Blade and water interaction to transfer energy, there are centrifugal pump, axial flow pump and mixed flow pump and other types. The technical parameters of pump performance are flow, suction, head, shaft power, water power, efficiency, etc.
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