An AHD camera is a camera that transmits high-definition video through an analog signal, using a technology called AHD (Analog High Definition) technology. This technology can achieve higher resolution and sharper image quality than traditional analog video. AHD cameras work similarly to traditional analog cameras, but AHD cameras have higher resolution and sharper image quality.

The working principle of AHD cameras involves several components, including image sensors, AHD sensors, and coaxial cables. When an image sensor of an AHD camera captures an image, it converts it into a digital signal and sends it to the AHD chip. Compared to traditional analog cameras, AHD cameras can provide higher resolution and sharper image quality. For example, a 720p AHD camera can provide a resolution of 1280 x 720 pixels, and a 1080p AHD camera can provide a resolution of 1920 x 1080 pixels. AHD cameras can also be easily upgraded on existing analog video surveillance systems without having to replace the entire system, as AHD cameras use the same coaxial cable and BNC connectors.

To sum up, the working principle of AHD cameras involves converting digital signals into analog signals and transmitting them over a coaxial cable. It can provide HD video transmission with higher resolution and sharper image quality than traditional analog cameras. AHD cameras can also be easily upgraded on existing analog video surveillance systems without having to replace the entire system. In addition, it is worth noting that the working principle of AHD cameras also involves the role of AHD sensors. AHD chips can convert digital signals to analog signals and transmit them to coaxial cable. These chips are usually built into AHD cameras rather than installed in video surveillance systems. Thanks to the role of AHD chips, AHD cameras can provide higher image quality and resolution than traditional analog cameras while maintaining compatibility with analog video surveillance systems. In practical applications, people can choose AHD cameras with different resolutions and functions according to their own needs and budgets to meet different surveillance requirements.