| 摘要 |
PURPOSE:To control the rotational angle of a microphone in accordance with the measured value of acoustic characteristics, by synchronizing a measurement system for the acoustic characteristics with a driving system for the microphone. CONSTITUTION:A microphone 1 for measurement is suspended from one end of an arm 2, which is connected at the other end to the power shaft of a step motor 3 fixed to a perpendicular surface. Thus, the microphone 1 for measurement rotates around a body 4 to be measured while drawing a circular track by driving the step motor 3. In this case, an acoustic signal 6 from the body 4 measured by the microphone 1 is inputted to a computer 7. After the arithmetic processing of this computer 7, a pulse signal 8 is fed back to the step motor 3 on the basis of the processing result to rotate the microphone 1 at a prescribed angle of rotation through the arm 2. |
