The invention relates to a wonderful-section checking circuit, which can check one wonderful-section of one video signal, wherein said circuit comprises: a volume track module, a volume difference checking module, and a wonderful-section checking module; said volume track module is used to estimate several volumes of one voice signal; said volume difference checking module is coupled to the volume track module, to calculate out several volume difference values via said volumes; and the wonderful-section checking module is coupled to the volume difference checking module to find the start point and the end point of said section, based on the volume difference values. And the video signal is relative to one image part of signal source, and the voice signal is relative to the voice part of said signal source. |