XS9922C is a 4-channel analog composite video decoding chip that supports both HDcctv and CVBS protocols up to 2M@30fps. XS9922C converts the received high-definition analog composite video signal through analog-to-digital conversion, video decoding, and 2D image processing into YUV format, which is then transmitted to the master chip via the BT1120 or BT656 interface, enabling real-time preview and recording. XS9922C supports bidirectional audio data transmission over a single coaxial cable, enabling voice intercom with remote cameras. It also supports bidirectional data communication with camera for remote camera control and firmware upgrades. XS9922C features an embedded audio codec with 5-channel Line-In and 1-channel Line-Out interfaces.