| 摘要 |
<p>The method involves connecting a forward sound center (1) and a rearward sound center (2) at an exciting voltage by a phase shifter circuit (15). A rearward phase difference is shifted along a main beam direction of a loudspeaker by the circuit, where the rearward phase difference is associated with center (2). The phase difference of the center (2) and a forward phase difference in a bass are reduced, where the circuit strongly damps exciting voltage with high frequencies. A limiting frequency of the phase shifter circuit is selected, which is smaller than a larger value of specific quantity. An independent claim is also included for a loudspeaker comprising a forward sound center and a rearward sound center.</p> |
