| 摘要 |
<p>An input acoustic signal is separated into a low-frequency component and a high-frequency component. A delay corresponding to a desired position of the focal point is imparted to each component for each speaker unit. The delay-imparted low-frequency component is weighted by using a first window function, and the delay-imparted high-frequency component is weighted by using a second window function (e.g., a Hamming window function). The weighted high- and low-frequency components are added to each other for each speaker unit, thereby driving the speaker units. The weighting using the first window function is relaxed more than that using the second window function. Thus, the difference between the acoustic directivities of the low- and high-frequency components is reduced.</p> |
