Different synchronization methods between constant speed balls

The following is mainly based on the different synchronization methods between the constant speed dome cameras that the user is using:

Direct sync, color video composite signal sync, external sync, DC line lock, and full sync.

The full lock is the best way to fully synchronize between two precision applications such as a broadcast studio constant speed dome camera. It will synchronize: horizontal, vertical, even/odd areas, color trigger frequency and phase.

Vertical synchronization is the easiest way to synchronize two constant-speed dome cameras. The vertical drive frequency ensures that the video can be used to display several image sources on the same monitor using an old-fashioned switching period or a four-split machine. The vertical drive signal is typically composed of pulses with a repetition rate of 20/16.7 milliseconds (50/60 Hz) and a pulse width of 1 to 3 milliseconds.

The color video composite signal represents video and color trigger signals, meaning that the constant speed dome camera can be synchronized with an external composite color video signal. However, although it is called color video composite signal synchronization, only horizontal sync and vertical sync are actually performed, and no color trigger sync.

External synchronization is very similar to color video composite signal synchronization. A constant speed dome camera can synchronize to the video signal of another constant speed dome camera. An external synchronous constant speed dome camera can use the input color video composite signal to extract horizontal and vertical sync signals for synchronization.

DC line locking is an ancient technology that uses a DC 50/60 Hz power line current to synchronize a constant speed dome camera. Because DC 24 volt power supplies are widely used in most building fire alarm systems, they are very easy to obtain. Since the old model of the switcher and the splitter system does not have a digital memory function, it is necessary to maintain a stable image, and the synchronization between the cameras is necessary. The DC line lock is the constant speed dome camera synchronized to the AC 50/60 Hz, and the time between the color channels is related. Unconstrained horizontal and vertical signals can lead to poor color conversion (color stage design), so all users who use AC line lock inevitably lose good color conversion.