| 摘要 |
PURPOSE:To attain sound collection excellent in understandability with high sound quality even under high sound noise by providing a high pass filter extracting a high frequency component of an output of a main microphone, a low pass filter extracting a low frequency component of an output of a sub microphone and an output adder of both filters. CONSTITUTION:An output level of a sub microphone 12 is adjusted by a sensitivity adjustment device 14 in order to correct the level difference from a main microphone 11 due to a distance difference. A high frequency component with a deteriorated frequency characteristic is eliminated from the sub microphone output after level adjustment by a low pass filter 15 and only the low frequency component with excellent frequency characteristic and S/N is extracted. On the other hand, a low frequency component with a deteriorated frequency characteristic is eliminated from the main microphone output by a high pass filter 13 and only the high frequency component with excellent frequency characteristic and S/N is extracted. Thus, the high frequency component from the high pass filter 13 and the low pass component from the low pass filter 15 are added by an adder 16. Thus, an output with excellent frequency characteristic and S/N over all the frequency bands is outputted externally from the adder 16. |
