Patent ID: 11912194
Assignee: KIA CORPORATION
Field: Other consumer goods (Other fields)
Classification: CPC B  G  H | IPC B  G  H

Claim 0:
1. A sound output apparatus of an electric vehicle, the apparatus comprising:
a sensor configured to sense a driving speed of the electric vehicle and a number of revolutions of a driving motor of the electric vehicle;
a storage configured to store opposed-phase sound sources of a noise according to the number of revolutions of the driving motor of the electric vehicle; and
a controller configured to allow an opposed-phase sound source corresponding to the number of revolutions of the driving motor of the electric vehicle, from among the opposed-phase sound sources stored in the storage, to be output when the driving speed of the electric vehicle exceeds a predetermined speed to reduce the noise according to the number of revolutions of the driving motor of the electric vehicle;
wherein the noise includes a noise of the driving motor, a noise of a decelerator, and a noise of an inverter that are generated as the driving motor rotates;
wherein the controller is configured to obtain separately the noise of the driving motor, the noise of a decelerator, and the noise of the inverter according to the number of revolutions of the driving motor of the electric vehicle; and
wherein the controller obtains each frequency information of the noise of the driving motor, the noise of the decelerator, and the noise of the inverter by performing Fast Fourier Transform (FFT) on the noise of the driving motor, the noise of the decelerator, and the noise of the inverter obtained separately according to the number of revolutions of the driving motor of the electric vehicle.