| 摘要 |
PURPOSE:To realize a microphone device easily obtaining a desired directivity regardless of its small size. CONSTITUTION:The device is provided with a 1st microphone 11 to collect a desired sound and a 2nd microphone 12 with a directivity in which the sensitivity in the incoming direction of the desired sound signal is low. A sound signal from the 2nd microphone 12 is fed to a subtractor means 15 via an adaptive filter means 24. A subtractor means 15 subtracts an output signal of the adaptive filter means 24 from the sound signal of the 1st microphone 11. A means to adjust the adaptive filter means 24 is provided to minimize an output power of the subtractor means 15. |
