| 摘要 |
PURPOSE:To prevent effect dispersion from being generated by disabling the installation of a speaker for cancellation at an optimum position by outputting the compensating tone of an opposite phase and equal sound pressure in comparison with noise from the speaker. CONSTITUTION:The noise controller equipped with an opposite phase signal generation part 33 for feedback to the formation of the compensating tone is provided with direction change type speakers 1 and 2 in plural directions for outputting the compensating tones and revolving the fixed shafts, microphone 3 for measuring intensity provided with a couple of three sensor microphones installed at both of terminals of bar-shaped parts with fixed lengths respectively perpendicular to three directions so as to catch residual tones, analysis circuit 4 for analyzing the sound pressure distribution of residual tones and the flow of tones, and angle control circuit 5 for controlling the revolutions of fixed shafts by calculating the angles of turning the direction change type speakers 1 and 2 corresponding to the positions or the flow of tones according to the maximum value of the sound pressure distribution. |
