| 摘要 |
PURPOSE:To prevent a frequency characteristic from being affected by changes in directivity by using a directive microphone unit and a non-directive microphone unit. CONSTITUTION:The directive microphone unit 17 and the non-directive microphone unit 18 are connected to a resistor 9, and an output is obtained from a slider 9-3. The directive microphone unit 17 consists of two microphone units 11, 12 arranged at a prescribed interval, a phase shift circuit 7, an adder circuit 5 and an equalizer 13. When the slider 9-3 is placed near an end point 9-2, the directivity is nearly the secondary directivity. When the slider 9-3 is placed nearly at the center between the end point 9-2 and a start point 9-1, the directivity is nearly an intermediate directivity between the 2nd order directivity and the non-directivity. When the slider 9-3 is placed near the start point 9-1, the directivity is nearly the non-directivity. |
