What does video synchronization ensure about the signals from multiple devices?

Video synchronization is an essential aspect of closed circuit television (CCTV) systems, particularly when multiple cameras and devices are involved. When signals from multiple devices are synchronized, it means that the video signals are in phase with each other. This is crucial for ensuring that the images produced by different cameras align properly in time, allowing for coherent and seamless viewing or recording of events.

When signals are in phase, it contributes to reducing issues like flickering or tearing in the video output, which can occur if the sources are not synchronized. It also helps in improving the overall quality and clarity of the video, especially when multiple views or angles are displayed simultaneously. Thus, achieving synchronization ensures that all devices work harmoniously together, leading to a more effective surveillance operation.

This focus on phase alignment is why the other options do not accurately capture the essence of video synchronization: compatibility pertains to how different formats can work together, processing speed emphasizes the rate at which the devices handle the data, and independent frequencies would suggest that the devices are operating separately rather than in unity.