I want to know the design scheme of central control system.

With the continuous development of society, information exchange and communication become more and more frequent and important. Various audio-visual equipment, projection equipment, conference system, etc. Started to enter all walks of life. The current conference room and classroom are not a podium, a chair and a microphone, but all kinds of advanced multimedia conference teaching equipment. Such as projectors, DVD players, video recorders, video display stands, multimedia computers and electronic screens. Some large conference rooms are also equipped with simultaneous interpretation system, electronic voting system, large screen projection system and multi-screen switching system. The use of a variety of equipment will inevitably bring complicated equipment operation. Such as: turn on the power of various devices, turn off the lights, frequently switch various audio and video signals, and constantly switch projection images. In this case, a "central system" equipment that can centrally manage these devices and control various resources in conference rooms and classrooms has emerged.

Working principle of central control system: the central control system adopts multi-computer communication technology and system integration technology, combines the controlled devices according to the actual operation requirements of users, and then integrates the final operation process of each device into simple operation. In short, the central control system can centrally control video recorders, DVD players, video kiosks, projectors, electric screens, electric curtains and other equipment. The basic composition of the central control system: ★ Host: it plays the role of receiving the control signal of the touch screen, and interpreting and executing it. ★ Color LCD Touch: You can directly preview the view and control the whole process, which is simple and quick. ★ Embedded panel: generally installed at the door, which is convenient for operation when entering or leaving. ★ Volume control module: used to control audio equipment. ★ Incandescent lamp dimmer: used to control and adjust lighting equipment. ★ High-voltage relay module: used to control electric hanger, screen, equipment power supply, fluorescent lamp and other equipment. ★ Infrared emitter: used to control infrared devices such as DVD/VCR/ physical exhibition stand. ★ External power supply: used to supply power to all equipment. Classification of central control system: 1, simple central control system: generally used in multimedia classrooms in primary schools, mainly in places with few control equipment; 2. Intelligent central control system: commonly used in multimedia classrooms in universities and middle schools, which can control multiple devices; 3. Network central control system: generally used in schools with multiple central control systems, mainly to facilitate management and control; 4. Conference central control system: generally used for multifunctional conference rooms, generally controlled by wireless touch screen; 5. Programmable central control system: generally used in large conference rooms, with many control devices, which can provide programming interfaces; Structure of central control system: The central control system generally consists of four parts: 1. User interface; 2. Central control host; 3. Various control interfaces; 4. Controlled equipment. Specifically, it can be divided into the following modules: audio and video switching module. VGA computer signal switching module? Infrared learning transmitting module? Device power management module? Electric screen control module? Timbre and volume processing module? Control interface processing module? The central control system of the power module can not only complete the specific functions of the above modules, but also add other control or communication functions through programming? . The characteristics of the central control system: provide a variety of user interface. (standard PC, LCD touch screen, manual control panel): Personalized control interface design makes your operation simple and handy. At the same time, all audio-visual equipment can be seen at a glance. Multiple devices can be controlled at the same time. When the motor or projector is used to perform, other audio and video sources can be previewed, which has the characteristics of high integration, perfect equipment control mode, clear operation interface, strong system expansion function and high reliability. Low cost, high performance, high integration and full digital control. Stand-alone direct access: DVD player, video recorder, video display stand, video camera, recording card holder, computer, notebook, power amplifier, wired microphone, wireless microphone, electric screen, projector and power controller. Curtains and lights. All-digital voice control, sound mixing, providing equipment expansion interface. Application of central control system Central control system is generally used in multimedia conference rooms, audio-visual classrooms, monitoring and command centers, news release rooms, environmental control and so on. Taking the multimedia conference room as an example, the central controller is the control center of all audio-visual teaching equipment. All audio-visual teaching equipment in the classroom, such as video recorders, DVD players, projectors, electric screens, stereos, indoor lighting and curtains, can be connected to and controlled by the central controller. Users can intuitively operate the whole system just by sitting in front of the touch screen, including system switching, equipment switching, lighting brightness level, signal switching, signal source playing and stopping, various combination modes entering and switching, volume adjustment, and conference sound system sound reinforcement; Digital conference and simultaneous interpretation system for discussion, voting and voting; Video conference system for teleconference; Large screen projection system for video and VGA signal display; A multimedia peripheral for providing audio and video signals; Used for automatic integrated control of global environmental facilities, system equipment control and other systems.

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