Patent ID: 11968521
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H  G | IPC H

Claim 8:
9. A method of controlling an audio apparatus, the method comprising:
receiving, by a signal receiver, a left-channel signal and a right-channel signal of a stereo audio signal;
blocking, by a filter, a signal in a band exceeding a predetermined frequency based on frequency bands of each of the received left-channel signal and right-channel signal;
generating, by a controller, a center-channel signal of the stereo audio signal based on the left-channel signal and the right-channel signal passing through the filter;
obtaining, by the controller, envelope data of the left-channel signal based on a size of the left-channel signal passing through the filter;
obtaining, by the controller, envelope data of the right-channel signal based on a size of the right-channel signal passing through the filter;
calculating, by the controller, a difference value between a signal size by time of the envelope data of the left-channel signal and a signal size by time of the envelope data of the right-channel signal;
applying, by the controller, an absolute value to the calculated difference value;
calculating, by the controller, a signal level sensitivity between the left-channel signal and the right-channel signal by smoothing the envelope data to which the absolute value is applied according to a predetermined filtering coefficient;
determining, by the controller, a similarity between the left-channel signal and the right-channel signal based on the calculated signal level sensitivity; and
controlling, by the controller, the generated center-channel signal to be output in response to the determined similarity.