| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To allow directivity to be switched to either cardioid, super-cardioid and hyper-cardioid, by combination of existing microphone units. <P>SOLUTION: The system includes a cardioid unit 20 with cardioid directivity and an omnidirectional unit 30 with omnidirectional directivity. Audio signal output of the omnidirectional unit 30 is adjusted in a level adjustment circuit to a prescribed level and subtracted from audio signal output of the cardioid unit 20 in an arithmetic circuit 21. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
