Patent ID: 7742111

Claim:
A highlight detecting circuit for detecting a highlight segment within a video signal, comprising: a pitch-tracking module for estimating a plurality of pitch values for an audio signal; a pitch difference detecting module coupled to the pitch-tracking module for computing a plurality of pitch difference values according to the pitch values; and a highlight detecting module coupled to the pitch difference detecting module for determining a starting point and a stopping point of the highlight segment according to the pitch difference values; wherein the video signal corresponds to an image part of a signal source and the audio signal corresponds to an audio part of the signal source; and, with respect to generation of a specific pitch difference value, the pitch difference detecting module determines the specific pitch difference value for a specific pitch value by summing a plurality of pitch values prior to the specific pitch value to generate a first sum value, summing a plurality of pitch values following the specific pitch value to generate a second sum value, and setting the specific pitch difference value by a difference between the first and second sum values.