Patent ID: 8295672

Claim:
A video recorder, comprising: at least one storage system and at least one processor; and a sound occurrence detection system stored in the at least one storage system, and being executable by the at least one processor to monitor an area; the sound occurrence detection system comprising: a relationship establishing module operable to establish a relationship between a rotation angle of the video recorder and a sound output orientation of each sound source in the area; and a sound detection module operable to determine a current sound output orientation of a sound occurrence in the area, and a current rotation angle of the video recorder according to an established relationship related to the current sound output orientation, and control a drive motor of the video recorder to rotate the video recorder according to the current rotation angle to record videos and sounds of a sound source that causes the sound occurrence; wherein the relationship establishing module is further operable to: (a) divide the area into a plurality of subareas, select a subarea as a normal monitor area of the video recorder, and control the video recorder to focus on the center of the selected subarea; (b) place a sound generator at the center of the selected subarea, obtain a first sound output from the sound generator, and analyze the first sound to get a standard sound output orientation; (c) control the video recorder to focus on the sound generator when the sound generator is placed at the center of another subarea, obtain a second sound output from the sound generator, and analyze the second sound to get a current sound output orientation; (d) calculate a rotation angle of the video recorder according to the standard sound output orientation and the current sound output orientation, establish a relationship between the rotation angle and the current sound output orientation, and control the video recorder to refocus on the center of the selected subarea; (e) repeating the steps of (c) and (d) until relationships of all the subareas have been established; and (f) generate a relationship list according to all established relationships.