| 摘要 |
PURPOSE: An audio system is provided to effectively control a sound field in a concert hall by using a high-powered ultrasonic wave generating device without remodeling sidewalls and a ceiling of the concert hole. CONSTITUTION: A reflection wall formed at a ceiling of a concert hole is replaced with a first high-powered ultrasonic wave generating device(1051) capable of reflecting a sound wave. A part of a rear wall of the concert hole is replaced with the first high-powered ultrasonic wave generating device(1051) capable of reflecting the sound wave and the remaining of the rear wall of the concert hall is replaced with a second high-powered ultrasonic wave generating device(1031) capable of absorbing the sound wave. Thus, reflection degree and absorbing degree of the sound wave are electrically controlled. The first high-powered ultrasonic wave generating device(1051) is also installed at the front of a stage in order to prevent a howling phenomenon.
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