Nittobo Acoustic Engineering Co., Ltd.

Azbil Corporation

Hiroshi Ohyama

Shinji Ohashi

Kazuhiro Takashima

Hideo Tsuru

Hirofumi Nakajima

Yuichi Miyazaki

Kazuhiro Makino

Yasushi Satake

Yoshio Tadahira

Naoyuki Akai

Taichi Higashioka

Takaaki Yamanaka

Provided is a noise identifying apparatus and noise identifying method, allowing automatic identification of whether or not a measured noise has been influenced by a non-object noise, using a simple system. Apparatus includes a sound detection unit, including plural microphones and/or particle velocity sensors; a sound source direction specifying unit, specifying an instantaneous direction of a sound source for each unit time, on the result of detection by the sound detection unit; a variation degree calculating unit, calculating a variation degree of the plural instantaneous directions specified by the sound source direction specifying unit for a prescribed period set longer than the unit time; and a non-object noise determining unit, determining the existence/absence of a non-object noise having influenced the measurement of an object noise taken as an object to be measured, coming from a noise source, on the variation degree calculated by the variation degree calculating unit.

Noise identifying apparatus and noise identifying method using the same

A displaying device includes a first storing portion that stores first connection data indicating connection statuses of a plurality of instruments and a controlling system, a second storing portion that stores second connection data indicating connection statuses of a plurality of instruments and an instrument controlling device, a displaying portion that displays the first connection statuses through the first connection data and the second connection statuses through the second connection data, and a display controlling portion that causes the first connection statuses and the second connection statuses to be displayed separately on the displaying portion.

Display device that separately controls first and second display windows for indicating connection statuses of plurality of instruments on display device

The open air layer-type vibration reduction structure is provided with at least one plate-like member of which the obverse surface faces toward the open space side; and a frame spaced at an interval from the reverse surface of the plate-like member, and an air layer is formed between the plate-like member and the frame. An air-permeable ventilation portion is formed at least one of the plate-like member and the frame, such that the average value of the flow resistance on the surface of at least one of the plate-like member and the frame, which forms an air layer, is in a range greater than 0 N&#xb7;s/mand equal to or less than 1,000 N&#xb7;s/m. The ventilation portion may be configured such that the sound pressure level generated within the air layer by applying an external force to the air layer is reduced by 3 dB or more.

Open air layer-type vibration reduction structure

There is provided a sound field adjusting method that can provide an acoustic improvement effect tailored to the characteristics of various acoustic rooms, with small differences in reflection properties between sound receiving points. The diameters of a plurality of columnar reflectors are calculated so as to diffuse sound waves of respective different frequency ranges. An arrangement condition is calculated so that the columnar reflectors having the calculated diameters form a plurality of reflecting surfaces that reflect the sound waves of different frequency ranges in random reflection directions, with random reflection time delays, or in random phases. The plurality of columnar reflectors having respective different diameters are then arranged under the arrangement condition. The arrangement condition is calculated to form a reflecting surface for a sound wave of a higher frequency range near a sound source, and form a reflecting surface for a sound wave of a lower frequency range far from the sound source. A sound absorbing structure by using the internal space of the arranged columnar reflectors provides effective countermeasures against low-range standing waves.

Reflector structure, sound field adjusting method, columnar reflector structure, room, program, and various acoustic room designing system

It is possible to simultaneously identify the sound coming direction from a sound source in all directions and estimate the sound intensity of the sound source. A plurality of microphones () are arranged on the surface of a baffle () of a shape such as a sphere and polyhedron so that sound from all directions are acquired. A calculation device () calculates the amplitude characteristic and the phase characteristic of acoustic signals acquired by the microphones (). The signal information and information on sound field analysis around the baffle are integrated and calculation to emphasize a sound coming from a particular direction is performed for all the directions so as to identify the sound coming direction from a sound source. According to these calculation results and the distance input by an input device (), it is possible to estimate the sound intensity of the sound source at a plurality of portions generated at the sound source or boundary surface.

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Tokyo, Japan

Hiroshi Ohyama