Nittobo Acoustic Engineering Co., Ltd.

Shinji Ohashi

Hiroshi Ohyama

Koichi Yamashita

Yasushi Satake

Kazuhiro Takashima

Yoshio Tadahira

Katsuyuki Kanazawa

Hideo Tsuru

Hirofumi Nakajima

Yuichi Miyazaki

Kazuhiro Makino

Kenichi Morio

Toshihito Matsui

Taichi Higashioka

Takaaki Yamanaka

Provided are a sound generation system and a sound recording system, which are placed in a room to adjust sound. A columnar body is disposed around a sound source to adjust how much sound of a low-tone range, as well as of a middle- and high-tone range, is absorbed and diffused. Moreover, a columnar body is disposed around a recording device to adjust how much sound of a low-tone range, as well as of a middle- and high-tone range, is absorbed and diffused. The columnar bodies may be made of a combination of different diameters and/or lengths. The arrangement distances may be random. With the columnar body disposed at the most appropriate location, it is possible to adjust sound in a wide band.

Sound generation system, sound recording system, sound generation method, sound recording method, sound adjusting method, sound adjusting program, sound field adjusting system, speaker stand, furniture, speaker cabinet, and speaker device

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

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

Provided is a high-accuracy signal judgment method for noise or vibrations of a living environment. Provided is a signal judgment method associated with noise or vibrations of a living environment. The signal judgment method includes: inputting, into a model equation of a to-be-measured/analyzed target, unknown data; and obtaining an output value as a probability value of whether the unknown data is a to-be-measured/analyzed target. The model equation of the to-be-measured/analyzed target is created with the use of measured already-known data. The model equation is created by prediction model equation calculation means. Incidentally, a logistic regression equation can be used as the prediction model equation.

Signal judgment method, signal judgment apparatus, program, and signal judgment system

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

Shinji Ohashi