Patent ID: 7945059

Claim:
A speaker device comprising: a carrier wave generating unit that generates an ultrasonic frequency band carrier wave; a modulating unit that modulates the ultrasonic frequency band carrier wave output by the carrier wave generating unit with an audible frequency band input signal; a level controller that controls a level ratio between a modulated wave output by the modulating unit and the audible frequency band input signal; a mixer that mixes the modulated wave and the audible frequency band input signal whose levels are controlled by the level controller so as to generate a synthesis wave; an ultrasonic transducer that is driven with the synthesis wave and reproduces a signal sound; a first signal input terminal that receives a first audible frequency band signal output as a sound having high directivity; and a second signal input terminal that receives a second audible frequency band signal output as a sound having low directivity; wherein the first audible frequency band signal is supplied to the modulating unit from the first signal input terminal, and the second audible frequency band signal is supplied to the level controller from the second signal input terminal.