Nippon Telegraph and Telephone Corporation

Panasonic Intellectual Property Management Co., Ltd.

Suguru Oguchi

Atsushi Aratake

Yusuke Yoshimura

Hisatoshi Kasahara

Yoshihiro Iriyama

Shuichi Yanagi

Yuta Ikeguchi

Yasuhisa Yamazaki

Mamoru Kanayama

Kenji Hiyoshi

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.

Audio spot system and audio spot forming method

An absolute coordinate acquisition method is an absolute coordinate acquisition method for acquiring absolute coordinates of an underground pipeline, the method including: a marking step Sof setting a plurality of reference points on a road surface and setting a measurement point on a pipeline installed inside an excavated ditch; a measurement step Sof measuring absolute coordinates of the reference points; a relative position calculation step (Sto S) of calculating relative positions of the reference points and the measurement point to a reference position; and an absolute coordinate calculation step Sof calculating absolute coordinates of the measurement point based on the absolute coordinates of the reference points and the relative positions of the reference points and the measurement point.

Absolute coordinate acquisition method

A positioning terminal is provided and identifies, as appropriate, a satellite to be excluded, thereby improving positioning accuracy. A processor acquires a signal-to-noise ratio (SNR) and an angle of elevation for each satellite. The processor next identifies a satellite for which the SNR is less than a shielding SNR mask as a multipath satellite and selects the satellite to be excluded. The processor next generates positioning terminal positioning data using a positioning signal from satellites other than the satellite to be excluded. The processor next uses reference station positioning data and positioning terminal positioning data of the selected satellite to execute an RTK calculation.

Positioning method and positioning terminal

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Tokyo, Japan

Suguru Oguchi