| 摘要 |
PURPOSE:To reduce wind noise and to sufficiently secure a low frequency range, directivity, etc., in a windless condition by connecting a high pass filter(HPF) in accordance with a difference between the output levels of an unidirectional microphone and a non-directional microphone. CONSTITUTION:The microphone device is provided with the unidirectional microphone 1 for outputting the 1st acoustic signal, the non-directional microphone 2 for outputting the 2nd acoustic signal, a correcting means 3, the 1st detecting means 6 for detecting the output level of the 1st acoustic signal, the 2nd detecting means 7 for detecting the output level of a correction signal, a comparing means 8 for comparing both the output levels, and a control means 12 for connecting the HPF 10 to an acoustic output terminal 13 in response to the detection signal. Since the single directivity microphone 1 is more easily influenced by wind noise as compared with the non-directional microphone 2, the superposition of wind noise to the microphone device can be detected when the 1st output level is higher than the 2nd output level. Thereby, noise can be cut out from an acoustic output signal by connecting the HPF 10 to the acoustic output terminal 13. |
