WM7613B is a quad analog composite video decoding chip that supports both HDcctv and CVBS protocols up to 4-channel 4K@15fps. WM7613B 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.