| 摘要 |
PURPOSE:To sharpen the directivity to a close sound source by providing a sub-microphone in the vicinity of a main microphone, and adding the output of the sub-microphone to that of the main microphone. CONSTITUTION:The sub-microphone M2 is installed at a distance D from the main microphone M1. A correcting circuit 1 corrects the magnitude and the phase of the output voltage from the microphone M1 obtained from the close sound source (b) in order to make the said voltage approximately coincide with the output voltage from the microphone M1. A means 2 to remove the sound components of the close sound source (b) included in the output voltage from the microphone M1, acts so that the said sound components are offset by the output voltage from the microphone M2. |
