Receiving circuit and signal processing method for high definition multimedia interface

摘要

The present invention provides a receiving circuit applied to an HDMI, wherein the receiving circuit includes a decoder, a frame key calculating circuit, a line key calculating circuit and a control circuit. In the operations of the receiving circuit, the decoder decodes a data stream to generate at least one image frame, the frame key calculating circuit is arranged to calculate a frame key according to the image frame, the line key calculating circuit is arranged to calculate a plurality of line keys according to the image frame, and the control circuit determines to turn off or turn on the line key calculating circuit according to whether or not the image frame is displayed on a display panel.