| 摘要 |
PURPOSE:To provide a speaker which can realize a man-machine interface using sounds without mounting an earphone, etc., and without giving trouble to the surrounding, is small in size and has superdirectivity and the electronic apparatus formed by using this speaker. CONSTITUTION:The sound waves from a sound source section 1 which generates the sound waves of at least two different frequencies are propagated in a propagation section 2 and the sound waves of the frequency corresponding to the difference between these frequencies is generated. The sound waves from the sound source section 1 exclusive of the above-mentioned sound waves are absorbed by an absorption section 3. The compact constitution of the speaker 100 having the superdirectivity is enabled. |
