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Noise and Vibration Product News

ListenEAR noise dosimeter, noise dosemeter OSHA, ISO9612

Listen Ear Personal Noise Dose Meter Noise & Vibration Registration Instruments and Software, ISO9612, OSHA

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•Fast & Slow Time Weighting

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•Equivalent Continuous Noise Dose (LEQ)

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•Ability to Pre-Program with Ear Defender SNR Values

ON-SCREEN VIEWS  CURRENT PLUS MIN & MAX SOUNDLEVEL

READ MORE….

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Uncategorized

Noisy exhaust eradication a joint effort in Malaysia

Illegally modified motorcycle exhausts, or the eradication thereof, should be a collective effort by all relevant Malaysian agencies, says Transport Minister Datuk Seri Wee Ka Siong. Speaking during the launch of the Diesel Multiple Unit train at Pasir Was, Kelantan, Wee said the import and sale of illegally modified motorcycles and components needed to be addressed, as reported in The Star.

“Some say loud exhausts should be banned but it may not come under the Transport Ministry’s jurisdiction as it could involve the Customs Department and such,” said Wee, responding to social media posts accusing several ministries of allowing the sale of modified motorcycle parts. “Some people questioned how these exhausts entered the market and accused the Domestic Trade and Consumer Affairs Ministry of not stopping the sale of such prohibited items,” he said.

Saying that the sale of modified parts for vehicle use does not fall under the jurisdiction of the Transport Ministry, Wee suggested the relevant ministries collaborate on finding a solution. “We don’t want to trouble the people but there are complaints that the loud sound from these exhausts is causing some to lose sleep,” said Wee.

Wee emphasized the Ministry of Transport is taking an advocacy approach to the issue of noisy motorcycles, with offenders being called up for interviews by JPJ under Article 114 of the Road Transport Act, instead of being issued a summons. Those found guilty of modifying their motorcycle exhaust face a maximum fine of RM2,000 or six months jail, with the seizure of the non-compliant motorcycle an option under Section 64 of the Road Transport Act 1987.

The issue of motorcycle exhaust noise came to the fore around mid-February this year, after police and JPJ took what was felt by some in the riding community to be excessive action. Riders were subject to roadblocks and checks, leading to allegations from the public a minority segment of the vehicle population in Malaysia was being unfairly targeted and persecuted.

Categories
Asia Noise News

Malaysian police conduct noise checks on their own

Malaysian police conduct noise checks on their own

Perhaps in an effort to show the Malaysian public that the law is being applied equally, police conducted motorcycle noise and modification checks on police personnel. The operation was held by the Traffic Investigation and Enforcement Department (JSPT) on police personnel exiting police headquarters at Bukit Aman, Kuala Lumpur.

This was held in response to public sentiment on social media saying the recent over the top police action against motorcycles was only targeted at the riding public. The vehicle examination special op involved 15 officers and 35 other JSPT personnel, accompanied by 5 officers from the police Integrity and Standard department (JIPS), along with personnel from the Department of Environment (DOE).

During the operation, 280 vehicles were inspected, resulting in 146 summons issued for offences such as “fancy” number plates, no side mirrors, no road tax and exhaust modifications. The main objective of this surprise check is to ensure police personnel complied with the law and road rules, showing an example to the public, as stated on the JSPT Facebook page.

Malaysia traffic noise checks

What do you think dear reader, are the police doing the job we pay them to do or is this just mere window dressing and playing to the public gallery? The recent persecution of road users, notable motorcyclists, has reportedly become overbearing and many feel the police are targeting the lower-income and disadvantaged group in these times of pandemic and lockdown with the resulting economic downturn across Malaysia.

While overbearingly noisy exhausts are a nuisance, the current disproportionate response starts to bring to mind images of a police state. 

Categories
Asia Noise News

Brunei, Sabah: Mystery blast heard, early signs point to sonic boom or meteorite

Mysterious explosion heard in Sipitang, Labuan, Lawas (Sarawak) might originate from a sonic boom high in the skies...

KOTA KINABALU: The mysterious explosion heard by many in Sipitang, Labuan, Lawas (Sarawak), and parts close to these areas on Sunday (Jan 31) could have been a sonic boom or a meteorite which exploded in mid-air.

The Astronomical Society of Brunei Darussalam (PABD) said it received numerous reports from Bruneians who also heard the mysterious loud noise.

The PABD then issued a notice seeking eyewitness accounts of the phenomenon, which is believed to have occurred at about 11 am.

Some Bruneians later shared their experiences and uploaded blurry pictures of what appears to be a fireball trailing smoke to PABD’s Facebook page.

A Sabahan in Brunei, Joey Yong, said she heard something like extremely loud thunder but did not know what it was.

The accounts from these witnesses may be found here.

Earlier, authorities in Sabah, including the navy, police and fire brigade, said they did not receive reports of any incidents that could have caused the blast.

Sabah Meteorological Department director Amir Zudi Hashim said the department did not record any seismic activity that could have caused the sound.

Sonic boom cause of explosion like noise Sabah

 

People in Sabah who claimed to have heard the blast said they felt the earth shake when the explosion was heard.

Source

 
 
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Building Accoustics

How much sound can your walls block? With STC testing in Field Sound Transmission Class measurement

How much sound can your walls block? With STC testing in Field Sound Transmission Class measurement

In addition to the wall STC test performed in the testing laboratory, By using a standard ASTM E90 or ISO 140 eye test or building a mock up test, we can also provide onsite acoustics testing services for rooms that have already been built. This is known as the Field STC test in accordance with ASTM E336 or ISO 140-4, where the field STC test value is usually low. Than the results of the STC tested from the laboratory This is due to the fact that laboratory testing has completely eliminated the factor causing flanking transmission, known as flanking noise. This is different from the actual installation location where there is still a flanking transmission factor.

Test in the laboratory and the room where everything was installed is complete.
Geonoise (Thailand) Co., Ltd. offers all types of sound testing services by modern and international standards And give advice that is technically correct by the audio engineer directly

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Asia Noise News

Malaysian man apologises for making 11 speed bumps near his home

Malaysian man apologises for making 11 speed bumps near his home

BESUT (THE STAR/ASIA NEWS NETWORK) – A man who illegally installed 11 asphalt speed bumps on the street next to his house in Kampung Padang Luas, Jertih, has apologised for his action.

Mr Nor Muhamad Roslam Harun, 40, admitted his mistake in building so many speed bumps on a 40m stretch and causing a hassle to other residents.

“Police officers came to see me on Wednesday morning and asked me to remove all the speed bumps that I had installed.

“So I hired a bulldozer operator to remove all the speed bumps on the street, including the two original ones,” he told Bernama.

The case went viral on social media a few days ago after a man uploaded a picture of the “new speed bumps” on the street leading to his house, which he claimed had been installed by his neighbour.

Mr Nor Muhamad said he installed the speed bumps because he was often disturbed by the noise of passing vehicles.

“The noise from cars and motorcycles disrupts my sleep. I’m so stressed out and I also have other health issues.

“Actually, I wanted to make speed ‘humps’, but the asphalt hardened so quickly before they could be flattened, causing them to become bumps.

“This made the road inaccessible to all cars except four-wheel drives,” he said.

Mr Nor Muhamad revealed that he spent RM1,080 (S$355) of his Employees Provident Fund i-Sinar money to install the speed bumps.

Categories
Environment Industrial Noise and Vibration Product News

Noise Monitoring for your home, Thailand

 

The first DIY noise monitoring, easy to use and install, just plug in the power, wifi and ready to go, online data noise monitoring, accurate, calibrated, weatherproof. Automated alarms by email or messenger.

Noisy neighbours, noise from entertainment or from a factory, road noise?

Register the noise and discuss with the authorities how to resolve the issue.

SpotNoise noise monitoring from the Netherlands, now available via Geonoise Thailand for South East Asia.


Noise Nuisance Monitoring Thailand Noise Nuisance Monitoring Thailand, Malaysia, Indonesia, Vietnam

 
 
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Asia Noise News Environment Home Industrial

Scientists have pioneered a new technique to produce arrays of sound produced entirely by heat

The team of researchers from the Centre for Metamaterial Research and Innovation at the University of Exeter used devices, known as thermophones, to create a fully controlled array from just a thin metal film attached to some metal wires.

The results, published in Science Advances, could pave the way for a new generation of sound technology, including home cinema systems.

Traditionally, arrays have been used in a host of every day applications, including ultrasound and sound systems. Arrays allow sounds from several sources to be ‘steered’ in a certain direction, to gain greater control and clarity of the sound produced.

Conventional speaker arrays rely on the production of sound through driven movement of some object — such as a speaker cone. The new study, however, pioneers arrays of speakers that produce sound entirely by heat: thermophones.

Although thermophones have been in existence for more than 100 years, they have, until now, had limited real-world application. However, they have a host of advantages from their mechanical counterparts — including no moving parts and the ability to be mass produced from inexpensive, sustainable materials.

Crucially, they can even be made transparent and flexible, which is desirable for the new wave of flexible technologies being produced.

For the study, the researchers found that, when combined into an array, thermophones are able to reproduce the same control over sound fields as traditional arrays.

However, they do much more than this: as they are driven by electrical currents, the sound they produce mirrors the subtle movement of the current carriers as they flow through the device and, as a result, they create a much richer sound field than traditional arrays.

The researchers suggest that the study opens a route to radically simplify array design, showing that with thermophone technology, it is possible to create a fully controlled array from nothing more than a thin metal film attached to some metal wires.

David Tatnell, lead author of the study and a PhD researchers at the EPSRC Centre for Doctoral Training in Metamaterials said: “Using heat to produce sound is a game changer as it allows us to make speaker arrays smaller than ever before. This, as well as the ability to make the speakers flexible and transparent, has a lot of exciting potential applications, such as haptic feedback systems in smartphones and other wearables.

Credit: https://www.sciencedaily.com/releases/2020/07/200702113652.htm

Categories
Asia Noise News Environment Home Industrial

Impact of Soundscape in Perception

Previously, we have discussed how the human auditory system works and recognizes the sound direction. Now, we will discuss how sound is perceived through our mind. In acoustics, the sound processing into the human auditory system is divided into 2 different mechanisms, namely hearing and listening. Hearing is the process of the mechanism of sound wave propagation into the human auditory system due to the sensitivity of the human auditory system to the vibration of sound waves with a certain frequency and intensity. While listening is a process of hearing along with the interpretation of information about the environment of a place based on the details contained in the vibration of sound waves that are heard.

Interpretation of sound information in the listening process is the vibrations of sound waves that are heard by humans. That not only represents the source of the sound but also contains information about the environment in which the sound is heard due to the physical mechanism that occurs when the sound wave propagates. Listening is considered a complex mechanism because it involves multi-level attention and higher cognitive functions. There are three levels in listening that are used to explain the complexity of listening namely listening-in-search, listening-in-readiness, and background listening.

Listening then forms us in an interpretation and perception in an environment based on its acoustic conditions. For example, if we close our eyes and we are given a stimulus in the form of the sound of water, squeaking, and the sound of wind with a certain level of sound pressure (SPL) we can interpret this as a feeling of being in a park. Then if the sound is added to the vehicle’s sound stimulus with a sufficiently audible sound pressure level, this might disturb the atmosphere of the park, and we feel uncomfortable. The action and interaction of natural factors and / or human factors acoustically in a place is called soundscape. This is because the sound in the environment does not only focus on a person, but also how one interacts with the sound and how one’s attention to the sound that arises.

Simple soundscape involves the type of sound source, location related to activities that occur in the related environment, environmental conditions and various subjective things that shape one’s perception and interpretation. This relates to the definition of soundscape in building one’s perception where it is also influenced by their socio-cultural and also the soundscape approach is seen from various disciplines.The soundscape process can be seen in the process diagram in Figure 1.

The analysis of soundscape can produce information for the basis for taking action in the form of sound management, which is to sort out what sounds should be heard and what sounds should be covered with other sounds (masking noise), by directing the attention of visitors to certain sounds that are in line with expectations they are based on the function of the related place.

Written by:

Adetia Alfadenata

Acoustic Engineer

Geonoise Indonesia

support.id@geonoise.asia

References :                                                                     

1. B. Truax, Acoustic Communication. Ablex Publishi, 1984

2. A. Ozcevik and Z. Y. Can, “A Field Study on The Subjective Evaluation of Soundscape,” in Acoustics 2012, 2012, no. April, pp. 2121–2126.

3. F. Aletta and J. Kang, “Soundscape descriptors and a conceptual framework for developing predictive soundscape models,” no. October 2017, 2016.

The British Standards Institution, “BS ISO 12913-1:2014 – Acoustics — Soundscape Part 1 : Definition and conceptual framework,” ISO, 2014.

5. D. Botteldooren, C. Lavandier, and A. Preis, “Understanding urban and natural soundscapes,” in Forum Acusticum 2011, 2011, vol. 1, no. c, pp. 2047–2052.

Categories
Asia Noise News

Soundscape Under Covid-19

Many around the world are experiencing life with very low noise levels due to restrictions as we are confined to our home and there is a decrease in the industrial, transportation and leisure activity. This provides a wonderful opportunity to quantify and record for the future the lower noise levels of our soundscapes. With the reduction in shipping there is also a change in the underwater soundscapes.

Nowadays there are a high number of noise monitoring systems (noise monitoring terminals, city wide systems, underwater systems etc.) installed all over the world which will capture this information for the future. However, there are many acousticians working from home with access to a sound level meter that can be used to capture the soundscape from their balcony or from their garden and compare the before and after the restrictions.

The IYS 2020 committee has provided a central contact between a number around the world who were thinking similarly that there would be some benefit in coordination and a little standardization in the capture of the data. Marçal Serra from CESVA has taken a lead to set up a LinkedIn group COVID-19 Noise Reduction (at www.linkedin.com/groups/13844820/) and with hashtag #COVID19NoiseReduction for any posts.

The following is a general structure for those who wish to participate and share their data in the future. But do not break your confinement to report this data!

  • Place: Country and city (e.g., Spain village near Barcelona)
  • Primary noise source: (e.g., Traffic noise: note number of lanes per direction or Social noise: note if café/bar/restaurant/sporting)
  • Noise measuring system: The noise measuring system used to measure LduringLbefore, and Lafter
  • Noise level during COVID-19 confinement: Lduring, expressed as a weighted overall level (preferably LAeq,1 hour), spectrum or psychoacoustic metrics as Loudness. It could also be reported as an image of the noise time history or a weekly color map and/or compiled into a report/article/conference paper with the measurement details and the comparison data
  • Noise level before & after COVID-19 confinement: Lbefore & Lafter, expressed in the same way as Lduring and over the same time period.