| 摘要 |
PURPOSE:To eliminate a backside lobe by changing directivity to make the backside lobe insensible when the direction of the front lobe of a microphone array is changed. CONSTITUTION:The directivity of the microphone array is varied by using pressure microphones A1v-Anv and velocity microphones A1p-Anp as unit microphone elements for the constitution of the microphone array and changing the rate of mixture of the output signals of both microphones. As the direction of the front lobe of the microphone array is changed over the required front range of the microphone array, the back side lobe produced at the position specular symmetrical to the front lobe is made insensible in the microphone element units A1-An by changing the directivity of the unit microphone elements A1-An to eliminate the backside lobe. |
