Nippon Telegraph and Telephone Corporation

Yuta Ikeguchi

Atsushi Aratake

Yusuke Yoshimura

Hisatoshi Kasahara

Suguru Oguchi

Shuichi Yanagi

In an audio spot formation device D including a speaker unitand a support standthat supports the speaker unit, the speaker unitincludes a plurality of parametric speakersandthat divide a sound wave into a carrier wave and a sideband wave and radiate the carrier wave and the sideband wave, and a speaker disposition unitin which the plurality of speakersandare disposed, the speaker disposition unitis attached to the support standat a support unit P, at least one of a height of the support stand, an angle of attachment of the speaker disposition unitat the support unit P and a direction of at least one parametric speaker of the plurality of parametric speakersandis adjustable, and a position at which an audio spot is formed is adjusted via the adjustment.

Audio spot forming device

An audio spot forming system (S) is an audio spot forming system which transmits an alert sound to a vehicle traveling on a road, the audio spot forming system including a first parametric speaker () configured to emit a sideband wave, and a second parametric speaker () configured to emit a carrier wave, in which the sideband wave and the carrier wave are caused to intersect with each other on the road to form an audio spot.

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Tokyo, Japan

Yuta Ikeguchi