Method and apparatus for focusing sound using array speaker

摘要

Provided is a method and apparatus for focusing sound using an array speaker system. The method includes generating a plurality of delayed signals to be focused to a predetermined position from an input signal, filtering a low-frequency signal having a frequency that is lower than a reference frequency from the delayed signals, generating low-frequency focusing signals divided into 2 groups by adjusting a gain of the filtered low-frequency signal, and applying the low-frequency focusing signals divided into the 2 groups to speaker units of the array speaker system at both sides with respect to a center portion of the array speaker system and outputting the low-frequency focusing signals through the speaker units. In this way, the performance of sound focusing for the low-frequency signal can be improved and thus a listener located a predetermined distance from and in a predetermined direction relative to the array speaker system can clearly listen to the low-frequency focusing signals.

主权项

1. A method of focusing sound using an array speaker, the method comprising:
generating a plurality of delayed signals to be focused to a predetermined position from an input signal; filtering a low-frequency signal that is lower than a reference frequency out from the delayed signals into a filtered low-frequency signal; generating low-frequency focusing signals divided into 2 groups by adjusting a gain of the filtered low-frequency signal; dividing the low-frequency signal into a plurality of segments according to frequency band; and applying the low-frequency focusing signals divided into the 2 groups to speaker units of the array speaker at both sides with respect to a center portion of the array speaker and outputting the low-frequency focusing signals through the speaker units, wherein the generation of the low-frequency focusing signals comprises adjusting a gain of the filtered low-frequency signal so that the gain in the center portion of the array speaker is greater than zero and less than the gain in an end portion of the array speaker; and wherein the adjustment of the gain of the filtered low-frequency signal comprises adjusting the gain of the filtered low-frequency signal for each of the divided segments so that a difference between the gain in the center portion of the array speaker and the gain in the end portion of the array speaker increases as a frequency of a signal included in the divided segment decreases.