Nihon University

Toshiki Hanyu

Provided is an acoustic measurement device capable of reducing the number of microphones while solving a problem of the dependency of interval between microphones on the frequency. The acoustic measurement device comprises a sound reception section () and a calculation section (). The sound reception section includes a plurality of unidirectional microphones. The plurality of microphones of the sound reception section () are arranged such that the total sum of the unit vectors each facing the maximum sensitivity direction of the microphone is zero. The calculation section () calculates a particle velocity vector or acoustic intensity by multiplying respective unit vectors by measurement values of each of the plurality of microphones of the sound reception section and calculates acoustic information by vector-synthesizing the results.

Acoustic measurement device

An acoustic energy measurement device that measures acoustic energy, the acoustic energy measurement device has a sound receiving unit that performs sound/electricity conversion and includes a plurality of unidirectional microphones being so disposed that a sum total of unit vectors facing a maximum sensitivity direction thereof becomes zero. The acoustic energy measurement device further includes a sound pressure calculation unit that calculates sound pressure using an output from the sound receiving unit. Still further, the acoustic energy measurement device has a particle velocity calculation unit that calculates particle velocity using an output from the sound receiving unit. Still further, the acoustic energy measurement device has an acoustic energy calculation unit that calculates acoustic energy using outputs from the sound pressure calculation unit and the particle velocity calculation unit.

Acoustic energy measurement device, and acoustic performance evaluation device and acoustic information measurement device using the same

A sound source localizer is provided which includes a receiver () composed of a plurality of highly versatile microphones () each having a predetermined directivity D, a data base () which is to calculate a difference in directional sensitivity between one of the microphones () of the receiver () pointed in one direction and the other directed at an angle of 180 deg. to the one direction and has pre-stored therein information used for determination of an arrival direction and angle of a sound source, and a calculator () for calculating differences in level between signals received by the receiver () in different directions to determine the arrival direction, angle and sound level of the sound source with reference to the information stored in the data base ().

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Tokyo, Japan

Toshiki Hanyu