| 摘要 |
PURPOSE:To efficiently measure an acoustic characteristic on the spherical surface by a simple operation, by displacing an angle of an arm which has placed plural microphones on the virtual spherical surface. CONSTITUTION:Microphones 17 (17a-17e) are fixed to holding rods 24a-24e, are held, and these holding rods 24 are fixed to a setting rod 18 through installing tools 25a-25e. The microphones 17 are directed to a reference point 5 on a front 6 of a loudspeaker means 1, and are positioned on a single virtual spherical surface 26 centering around the reference point 5. When an arm 16 is displaced as to its angle round the axis on a virtual straight line 21 by a motor 23, an acoustic characteristic can be measured at a sound receiving point on the virtual spherical surface centering around the reference point 5. Each output from the microphones 17 is led out from a line 28 through a multiplexer 27, and is inputted to an acoustic characteristic measuring device 29. |
