Patent ID: 8812139

Claim:
An electronic device capable of auto-tracking a sound source, comprising: a driving member comprising a rotor; a housing fixed to the rotor; a first sound sensor positioned on the housing and configured for detecting sound from a sound source to generate a first sound signal associated therewith; a second sound sensor positioned on the housing spaced from the first sound sensor and configured for detecting the sound from the sound source to generate a second sound signal associated therewith; a third sound sensor positioned on a perpendicular bisector of a connection line of the first sound sensor and the second sound sensor and configured for detecting sound from the sound source to generate a third sound signal associated therewith; a microphone positioned on the perpendicular bisector of the connection line of the first sound sensor and the second sound sensor; and a processor positioned in the housing and configured for analyzing intensities of the first, second and third sound signals, and controlling the driving member to rotate along a direction in which the intensity of the third sound signal decreases, based on a difference between the intensity of the first sound signal and the intensity of the second sound signal, thereby moving the microphone toward the sound source, wherein the intensity of the first sound signal is representative of a first travel time t 1 of the sound from the sound source to the first sound sensor, the intensity of the second sound signal is representative of a second travel time t 2 of the sound from the sound source to the second sound sensor, and the intensity of the third sound signal is representative of a third travel time t 3 of the sound from the sound source to the third sound sensor, if a travel time difference (t 1 −t 2 ) between the first travel time t 1 and the second travel time t 2 is substantially equal to zero and the third travel time t 3 satisfies the following formula: t 3 >t 1 =t 2 , the processor is configured for controlling the driving member to rotate along the direction in which the third travel time t 3 decreases until the travel time difference (t 1 −t 2 ) is substantially equal to zero; and if the travel time difference (t 1 −t 2 ) is not substantially equal to zero, the processor is configured for controlling the driving member to rotate along the direction in which the third travel time t 3 decreases until the travel time difference (t 1 −t 2 ) is substantially equal to zero.