| 摘要 |
PROBLEM TO BE SOLVED: To provide an output control method of an ultrasonic speaker and an ultrasonic speaker system, which provides the optimum sound quality at all times even when a listener changes an angle between a sound wave radiation axis and an axis denoting a front direction of the listener with respect to the sound wave radiation axis of a sound wave transducer. SOLUTION: The ultrasonic speaker system wherein a carrier wave is modulated by a signal wave outputted from a signal source for generating the signal wave of an audible frequency band and a signal sound of the audible frequency band, is reproduced by driving the ultrasonic transducer by the modulated wave, includes: an angle measurement means for measuring a listener angle being an angle between the sound wave radiation angle of the ultrasonic transducer and the axis of the listener directed to the front side; a control information transmission means for transmitting control information including the listener angle information obtained from the angle measurement means; a control information receiving means for capturing the control information; and a control means for controlling filter processing executed by a signal processing means on the basis of the listener angle information included in the control information. COPYRIGHT: (C)2008,JPO&INPIT
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