Ultra-directional speaker system and speaker system drive method
AssigneeNEC Corporation
InventorKouji Hirayanagi
Life of this patent
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Abstract
An ultra-directional speaker system has a speech generation means, an ultrasonic generation means, an amplitude modulation means to which the speech generation means and ultrasonic generation means are connected, an electro-acoustic transducer means which converts an ultrasonic modulated signal that is output from the amplitude modulation means to an acoustic signal, and a virtual sound source positioning means that establishes the position of a virtual sound source by detecting the position of a listener by detecting the ultrasonic waves that are output from the electro-acoustic transducer means and reflected from the listener.
Claims14
An ultra-direction speaker system, comprising:
- a speech generation means;
- an ultrasonic generation means;
- an amplitude modulation means to which said speech generation means and said ultrasonic generation means are connected;
- an electro-acoustic transducer means that converts an ultrasonic signal that is output from said amplitude modulation means to an acoustic signal;
- and
- a virtual sound source setting means that detects a reflection wave from a listener of an ultrasonic wave that is output from said electro-acoustic transducer means and sets a position of a virtual sound source.
A speaker system drive method for use with an ultra-directional speaker system having a speech generation means, an ultrasonic generation means, an amplitude modulation means to which said speech generation means and said ultrasonic generation means are connected, an electro-acoustic transducer means which converts an ultrasonic modulated signal that is output by the amplitude modulation means to an acoustic signal, and an acoustic reflector that causes the ultrasonic modulated signal output from said electro-acoustic transducer means to be reflected and directed at a prescribed position, said speaker drive system detecting the position of said listener from the ultrasonic wave that is output from said electro-acoustic transducer means and reflected from said listener, and adjusting the curve rate of said reflector.
Dependencies are inferred from the claim text.