| 摘要 |
PURPOSE:To provide the directivity microphone system in which S/N of an objective sound for collection of sound is enhanced with simple configuration and a directivity pattern is easily changed in correspondence with the direction of a noise sound source or the like. CONSTITUTION:Angles THETA1-THETAN-1 corresponding to (N-1) angles theta1-thetaN-1 making the sensitivity to be zero with respect to an angle 8 between a line direction of sound receiving elements M0-MN-1 and a sound incident direction are inputted to n angle input section 30. A delay control section 40 calculates of 2N<-1> sets of delays based on the received (N-1) values THETAn (n=1-N-1) and sets them to 2N<-1> sets of delay circuits of a delay section 50. The signal from N-sets of sound receiving elements M0-MN-1 are digitally converted by an A/D converter section 20 and delayed by the 2N<-1> sets of delay circuits of the delay section 50 and a total sum section 50 calculates the total sum and the result is provided as an output. |
