Nippon Telegraph and Telephone Corporation

Yuya Ito

Hiroyuki Fukumoto

Yosuke Fujino

Toshimitsu Tsubaki

Marina Nakano

Miharu Oiwa

An aspect of the present invention is a Doppler compensation system including: a sound wave receiving element that receives a sound wave transmitted by a transmitter; a ground-speed-related quantity acquisition unit that acquires a ground-speed-related quantity that is a physical quantity related to a vector representing a ground speed of a receiver including the sound wave receiving element based on an acceleration of the receiver; an extraction unit that extracts a sound wave including an estimation target sound wave that is a sound wave to be estimated from among sound waves received by the receiver; an arrival direction estimation unit that estimates an arrival direction of the estimation target sound wave based on the estimation target sound wave; a reception-direction-speed-related quantity estimation unit that estimates a quantity related to a speed in a reception direction that is a direction in which the estimation target sound wave viewed from the receiver arrives based on the ground-speed-related quantity and a result of the estimation from the arrival direction estimation unit; and a Doppler compensation unit that compensates for waveform distortion due to Doppler effect of the estimation target sound wave based on a result of the estimation from the reception-direction-speed-related quantity estimation unit.

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Musashino, Japan

Yuya Ito