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Video Switching and Control Console
Name:admin  time2011.09.27  Read:

Video Switching and Control Console
1, simply type the PTZ camera and protective hood controllers
Its function is merely to achieve the implementation of single or multiple head rotation, up and down the pitch, on the PTZ camera lens control focus, iris and zoom to adjust zoom function, the device can also be more complex on the PTZ protective cover for heating and defrost control.
2, manual video switcher
It is the video switcher simplest, there are a number of keys on the device to display on a single monitor output of a video camera on the selected image. Manual switching is more economical and reliable, can be 4 to 16 video inputs switched to a monitor output. The disadvantage is that this type of switch used to manually switch on the camera, will appear on the monitor vertical flip and scroll until the monitor determines the input camera's vertical sync pulse will disappear.
3, sequential video switcher
Multiple video signals to be sent to the same place monitoring, can correspond to one way video monitor, but the monitor occupies a large, expensive, if monitoring is not required at all times, can be added in the control room of a switch, the camera the output signal to the input of the switch, the switch output terminal of the monitor, the input of the switch into 2,4,6,8,12,16, the switch with manual switching, automatic switch between the two operating mode , is to see which way manually switch where to put all the way; Automatic mode is the default video in order to delay switching, switching time can be adjusted via a knob, generally 1 second to 35 seconds. Switches are cheap (usually only five hundred dollars), the coupling is simple, easy to operate, but in a period of time can only see one of the input image. To simultaneously view on a monitor multiple camera images, you need to use Quad. Sequential video switcher is to make the images from multiple cameras on a single monitor displays a selection, and then another one display, camera display order and display duration set or modified by the user program. Sequential video switchers vertical interval switching to eliminate image flicker on the monitor, shake or roll, so that people can watch the monitor for comfortable viewing. The so-called vertical interval switching, is the video playback to switch the video in a way. Switch the electronic system to find each camera's vertical sync pulse, and then switch between the pulses of the vertical video, eliminating vertical scrolling on the monitor and jitter, to get the effect of switching without scrolling. Roll-free switching on the premise that the camera needs to have the line synchronization circuit, so multiple cameras with the same phase AC power supply, allows multiple cameras simultaneously generates a vertical sync pulse, which is using a 24V AC power CCTV cameras can be widely applied one of the reasons.
In larger systems, if the camera with different phases of non-24V AC power supply, the need to eliminate vertical scrolling on the monitor, the camera requires either asynchronous or signal having a lock function, or use the camera adjustable phase selection, depending on the AC power supply phase difference between the vertical synchronization timing to be adjusted. In order to monitor the needs of the general sequential switcher with alarm switching function, ie an alarm occurs, the order will automatically switch the alarm zone to switch to the camera image displayed on the monitor output.
4, video matrix switching and control console
The so-called video matrix switch is that you can choose Renyiyitai camera images at any given output displayed on the monitor, if M and N video camera monitors consisting of M * N matrix in general, depending on the application needs and devices template number of how many, matrix switching systems vary in small systems is 4 * 1, large systems can reach 1024 * 256 or greater.
In the video matrix switching and control system of the host as the core, each camera's image needs to go through a single coaxial cable to the switching and control host; PTZ and lens control, are generally twisted by the host via the line, or the first multi-core cable to the decoder / driver, the first of the decoder for decoding the signals coming, i.e. to determine what control action performed. Decoder / driver?? Illegally using this system, multiple priority levels between the keyboard arrangement.
● For system operation steps can be programmed with varying amounts of programming procedures available, can be triggered by time needed to run the program.
● There are a number of alarm inputs and relay contact output terminal, can receive alarm input and control output termination.
● There is a character generator can be generated on the screen, the date, time, place the camera number and other information.
● There with the computer interface
5, coaxial control matrix switching control system
It is a microprocessor core with video matrix switching and control capabilities of the system front-end camera. Coaxitron transmission technology is the development of equipment in today's mainstream surveillance systems, it requires a video cable can transmit both the video signal from the camera as well as PTZ camera, preset functions all control signals, which transmission mode saves material and cost, easy construction, maintenance simplification, system expansion and renovation in more flexibility.
Coaxitron method there are two types, one using frequency division, that is, the control signal is modulated with the video signal of different frequency ranges, and then transmitted together with the composite video signal, and then the demodulation of the field to distinguish between the two open; Second, the use of video signal during the vertical blanking interval to send control signals, similar to the teletext transmission.
Coaxitron switching control unit from a single cable is achieved through the head, the front of the lens and other camera motion control, it must be encoded by the host side in front after transmission decoding method to complete. This determines the need to have complete front-end camera motion control and drive decoder decoding device. With normal video matrix switching system is different, such decoder and only one connection between the host coaxial BNC connector plug.
6, the integration of computer-controlled or computer matrix switching and control systems
This is with the popularization of computer applications and the emergence of computer-style switches, and some by the computer chip and peripheral circuit control, some directly to computer control, in addition to completing the conventional video matrix switching and control functions on the camera outside the front , it also has a strong computer functions. For example, it has a strong keyboard password system can effectively prevent the powerless operational use; it has startup configuration procedures to a pull-down menu approach to program control; it has a system diagnostics to monitor all system functions; a printer interface can output the entire system operating conditions; it has networking capabilities, a variety of input / output interfaces, and some systems as well as video motion detection alarm images. Computer integrated control system is built into multiple channel alarm input and output can be connected with more than one sub-control keyboard and connect more decoder. Large systems can be used to control networked hierarchical layers.
Selection and installation
Commonly used on the market today hosts although different brands, different appearance, but functionally less.
Choice must first determine how many cameras they have the need to control, is not it also expanded the existing and possible future expansion of the number of cameras together, select the controller of inputs. For example, a residential area, currently only 10 houses are covered, the latter will have 15, each of them building install a camera, then at least have 25 video inputs to the control of the host, (because most of the control panel to enter, Output expansion module forms the input to a multiple of 8 increments) so you need to select 32 Enter the host.
Select the controller output approach is to look at the control room takes a few monitors. Such as the example above, if the control room needs at least four monitors, then the output on the choice of 4 or 5 outputs (output more does not affect performance, but the price will increase) the control of the host.
Currently there are common input control host 8,16,32,48,64,80,96,128 to 512, generally a multiple of 8 or 16 increments; output from 2,4,5,8,16,24 to 32 , generally a multiple of 2 or 4 increments.
Host has a variety of control codes, most are not compatible with its series of products must be able to use the device or description work. Such as decoders, auxiliary follower, alarm interface, sub-control keyboard, multimedia software and so on.
Decoder function is to host control code converted into an analog signal output: providing a head 24 volts or 220 volts AC, 12 volts DC lens, the auxiliary voltage of 24 VAC, two auxiliary switches, and some also provides 12 V DC supply. Decoder control system is the most commonly used device, the front end has a head or power-up, it requires a decoder. Decoder is divided into indoor and outdoor type, there is an outdoor waterproof boxes and provides wiper operating voltage. You must provide the decoder 220 volt power supply, jump address code decoder to avoid conflicts. Also to be noted the head of the operating voltage, because the head and the operating voltage of 24 volts 220 volts are two, if not with the decoder, ranging unable to work, while in the burning pan motor, resulting in unnecessary losses.
Decoder to the PTZ camera connection cable is not too long, because the control of the lens voltage is 12 volts or so, the transmission is far too much pressure drop will cause the lens can not be controlled. In addition, as multi-core control cable more expensive than unshielded twisted pair, so the cost will increase.
Outdoor decoder to do water treatment, in line mouth sealed with waterproof glue is a good method, but also easy to operate.
From the host to the decoder usually shielded twisted pair, a line can be connected in parallel multiple decoders with a total length of not more than 1500 meters (depending on site availability). If the decoder number is too large, need to add some auxiliary equipment, such as increased control code distributor or the last one decoder in parallel with a matching resistor (subject to the manufacturer's instructions).
In addition to the control room also was operating outside the PTZ camera and other equipment needed with sub control keyboard, each host can control the keyboard with the number of different sub-control keypad functions are different, and some can control monitor output, some can control the speed PTZ. Sub-control keyboard and the host generally shielded twisted pair connection.
Now due to the development of computer multimedia technology, the monitoring system has to move closer to its trend, the majority of manufacturers in the design of the monitoring host when leaving the computer interface, via connection cables and interface with the computer's serial port communication, insert a video capture card on the computer to view the image, insert a sound card to monitor the sound. Multimedia control software generally has the following functions: setting the system control panel models, set the communication port, set the system password, set the operation of the operator level, drawing electronic map, set the front of the camera properties (with or without head, motorized lens), right the maps have been added and deleted modify, arming and disarming the alarm detectors, control the video switching, PTZ, lens focus, the auxiliary switch is closed and so on. Multimedia software interface as well, allows the operator to accept more easily understood, it is now widely used.
Installation Notes: Due to monitor the output signal is 485 yards host, is unable to compete with the analog signal, so when installing equipment to do the ground work to ensure that there is no strong electrical feedback loop to the communication port, otherwise it will burn communications chips , so that the host does not work.
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