| 摘要 |
PURPOSE:To obtain a microphone device capable of setting directional characteristic narrower than before and fetching only the voice of a talker satisfactorily. CONSTITUTION:A bidirectivity microphone 61 with directivity characteristic superior in front and back directions, and a unidirectional microphone 62 with directivity characteristic superior in the front direction mounted inversely against the bidirectional microphone 61 are prepared. The output of the bidirectional microphone 61 is amplified by a forward amplifier circuit 65, and also, that of the unidirectional microphone 62 is amplified by an inverse amplifier circuit 66, and the output from the amplifier circuits 65, 66 are added by an adder circuit 67. |
