First, the time, date generator:
The device can produce the time and date that match the actual time, and can be adjusted by simple operation, and then the time and date words generated by the internal video and character superposition circuit are displayed on the screen. In this way, after using the time and date generator, the image has a time record, which is convenient for file storage and query.
Second, the character stacker:
This device, like the time and date generator, produces English or Chinese characters that are displayed on the image for the user to see at a glance. Chinese character characters have two implementation forms. One is fixed, and the required Chinese characters need to be solidified in the memory. This method is simple, low in price, easy to implement, but cannot be modified. Once the front-end device needs to change position, the character modification requires a professional manufacturer or The original manufacturer implemented the process, which was troublesome and time-consuming, and has now been gradually eliminated. The other is a dynamic character adder, which can be connected to a PC. The user uses the character setting software to dynamically set the characters. The content and display mode of the characters can be set by the user. This mode is flexible and easy to expand. Easy to modify, is the mainstream of the current character stacker.
Third, the video distributor:
Since a certain image in the system may need to be used for multiple processing devices, such as a monitor, a matrix switcher, a multiplexer, a video recorder, etc., according to the characteristics of the video signal, the video distributor must be added to distribute the video signal. Its function is to perform impedance matching, amplification, synchronization adjustment, etc. on the distributed video signal to avoid image quality degradation caused by video signal attenuation and impedance mismatch.
Fourth, the time base corrector:
The TV image signal will produce special phase distortion during the electro-magnetic and magneto-electrical changes and during transmission, causing the image signal per unit time to not be converted or recovered in unit time. We call it the time base error. In severe cases, the image will be inadvertently lost in hue and synchronization, causing the signal to scroll, jump, and flicker.
The time base corrector is a special device for correcting the time base error. This kind of equipment can rearrange the signals neatly, that is, give the signal different delays, make the advance part more delay, and the hysteresis part delay less, so the time base corrector is a delay amount controllable delay equipment.
The time-base correctors currently used are mostly digital and have a wide calibration range. The correction method is to perform pulse code modulation (PCM) on the playback signal, convert it into a digital signal, and then store it in a clock memory synchronized with the signal, while the read clock generated by the reference sync signal is continuously from the memory. The digital signal is taken out, and since the reading speed is uniform, the arrangement of the signals is neat. The read signal is further subjected to digital/analog conversion output, thereby ensuring the transmission quality of the image signal.
5. PTZ and lens controller:
The device is suitable for use on smaller, no decoder front ends. Generally, multi-wire control is adopted, and the principle is extremely simple. Only the voltage required for the work of the pan/tilt and the lens is generated, and the cable is transmitted to the front end to be connected with the corresponding action. The operation can be achieved using a button or a general key switch.

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