Trade.Information

The asahi beer, noise reduction technology of low frequency development

　The asahi beer on the 4th, being joint with TOA of the acoustic equipment manufacturer, announced that it developed the technology which decreases the noise of low frequency noise active control (*) with. Both corporations already concerning this technology the patent application being completed.
　As for sound of low frequency recently, adverse effect to human body such as headache and sleeplessness was pointed out, with the decrease sound arresting by the soundproof wall and the sound insulator etc measure was difficult.
　Those where the technology which this time was developed applies control sound to the inner sound arresting possible component of the main component of noise, decreases noise by the fact that two sounds to deny. At both corporations we are advancing the development of the noise active control control equipment which uses this technology, it is joint and you say that you aim toward the commercialization of early stage.

News Inside News;

Low frequency (Note 1) as for sound, wave length is long, it is the sound which is audible low in the person. Concerning the noise of this low frequency, state of mind also to the human body such as sleeplessness, headache and nervously impression physiological adverse effect is pointed out, recently, complaint number of cases to frequency sound is low an increase tendency, it is something where approximately the half of that relates to the factory and the place of business. At the environmental ministry, frequency 100 [Hz] noise problem below is defined “frequency sound problem low”, social interest to the measure has increased e.g., “guidance because of frequency sound problem correspondence is announced low” in 2004.
　On the one hand, in comparison with the sound of medium & high frequency, in sound of low frequency, it transmits & it diffracts the shield, there is a quality that the attenuation with the distance from the sound source is little. Because of that the decrease sound arresting by the soundproof wall and the sound insulator acoustic material etc which are general noise measure vis-a-vis the sound of low frequency, is not effective, it is assumed that effective measure is difficult.

　The asahi beer (Inc.) it developed the technology which this time was developed, individually, algorithm concerning the adjustment of control sound (Note 2) it has made the base. Algorithm of new development, as only the sound arresting possible component of the main component of noise is selected, has become the feedback system which is made correspondence possible even in change of frequency of noise, it minimizes the operational quantity and efficiently and effectively it decreases noise.
　Furthermore, TOA which does engineering development concerning “noise active control” individually (Inc.) with collaborative research was executed, noise reduction in the wide three dimensional space was made possible by among other things devising the relative position relationship of the speaker for sound arresting and the microphone for noise detection for noise source.

　So far the attempt which decreases noise making use of the principle of noise active control to be, TOA (Inc.) in, it has succeeded in the utilization of the Diesel engine exhaust sound arresting system in 1994. But, many of the technology which includes this system and is so far utilized were something which deals with one dimensional space like the closed space and exhaust duct such as headphone.
　Presently, the Asahi beer (Inc.) with TOA (Inc.) being joint, by, a less speaker and microphone in the midst of developing with the system, the device which in the range whose three dimensional space is wider shows the decrease effect in noise of low frequency it is. Because of this, it is thought the thing whose possibility of application to the various ways with actual environment is large.

　The latest engineering development did the Asahi beer (Inc.) the engineering development laboratory (Teruo Miyahara chief) with. At the same laboratory which was newly founded in 2001, research and development of the technical equipment which is connected to new business in the research field which designates “the food and health” and “environment” as the territory, is done. Concerning the noise reduction technology being due to the latest noise active control, it is one of the big problems which among the noises which impair environment are left, you observed to the noise of low frequency, with the purpose which is made new business by the fact that comfortable living environment is offered, you started research in 2002.

　Needs to noise measure of low frequency sound has increased by life inclination and the sound insulation characteristic improvement of the building and the home appliance product the noise conversion etc which seek the affluence of the user not only the factory and the place of business which use the big equipment equipment for business, regarding the general life space low.
　As the Asahi beer (Inc.) with, as for the technology which this time was developed for business we think the thing whose application to Takata road such as equipment equipment for national welfare is possible, in the future, direct to commercialization and TOA (Inc.) with advance cooperation development, it keeps doing occurrence source of noise of low frequency the demonstration test with the actual environment which such as factory becomes as an application development.

(Note 1) the frequency where the frequency sound wave and wave motion of radio wave are repeated in per unit time. As for unit hertz [Hz].
(Note 2) algorithm (mainly) it is procedure and calculation method in order to solve the problem of the specification which is with the computer and the like. Those which are described algorithm, making use of programming language are called the program

Asahi beer (Inc.) engineering development laboratory summary
Chief Teruo Miyahara
Establishment　　 2001 (2001) September
Address　　 The ibaraki Agatamori valley city green 1 Chome 1 address 21

TOA corporation summary (2007 3 end of the month presently)
Company name　　 TOA corporation (tea o a corporation)
Establishment　　 1949 (1949) April 20th
Representative Representative President Yoshikawa Takashi model
Head office address Kobe city Chuo Ku port Simanaka Cho 7-2-1
Presentation The tokyo stock exchange 1st section and the Osaka Stock Exchange 1st section
Capital 52,000,080,000,000 Yen
Main business Voice amplification broadcast equipment and communication equipment, in addition production and sale of information transmission machine instrument
Acoustic equipment and image equipment, in addition production and sale of electronic electrical machinery instrument
Above-mentioned lease of equipment and design operation of construction
Lease and management of real estate
Hole plan management of event entertainments such as lease management and music etc of studio
Gross sales 348,000,044,000,000 Yen (2007 March period connected gross sales)
The number of employees 2412 names (connection), 685 names (single unit)

In The Images;
principle of “noise active control

Release link: http://www.asahibeer.co.jp/news