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

Claim 0:
1. An audio apparatus comprising:
a signal receiver configured to receive a left-channel signal and a right-channel signal of a stereo audio signal;
at least one filter configured to block 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; and
a controller configured to:
generate a center-channel signal of the stereo audio signal based on the left-channel signal and the right-channel signal passing through the filter,
calculate a signal level sensitivity between the left-channel signal and the right-channel signal passing through the filter,
determine a similarity between the left-channel signal and the right-channel signal based on the calculated signal level sensitivity, and
control the generated center-channel signal to be output in response to the determined similarity,

wherein the controller is configured to:
obtain envelope data of the left-channel signal based on a size of the left-channel signal passing through the filter,
obtain envelope data of the right-channel signal based on a size of the right-channel signal passing through the filter,
calculate 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,
apply an absolute value to the calculated difference value, and
calculate the 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.