sound intensity method Articles

  • Reducing noise levels through engineering controls

      It"s fairly easy to control personal exposure to noise by limiting exposure time or using hearing protectors like ear plugs or ear muffs.  Engineering controls are usually applied to the machinery that produces noise. Imagine a 200 foot x 175 foot manufacturing facility with a 30 foot high ceiling.  In this building are a variety of cut-off saws, grinders, millers and other ...

  • Personal Ear Protection – PPE for noise at work

    Personal Ear Protection – the last resort PPE should always be regarded as a ‘last resort’ to protect against risks to safety and health in the workplace. The provision of personal hearing protection is no different.  You may find resistance from your workforce using them and they can be costly to maintain and replace.   They can also interfere with ...


    By Pulsar Instruments Plc

  • Case Study - Siemens Industrial Turbomachinery AB

    Problem Two large gas turbines (approximately 25m x 12m x 10m) were installed in an industrial area nearby an office building. The gas turbines generate a tonal noise component at around 2700Hz caused by the inlet channel blades pass frequency. This tone imposes a more stringent noise requirement on the supplier, forcing noise reducing actions being made on the turbine. ...


    By Norsonic AS

  • A New DIRAC Measuring Speech Intelligibility

    Speech intelligibility measurements in situations where there is a large distance between the receiver and the sound source, require the source and receiver to operate independently. While this leads more often than not to practical conflicts,DIRAC 4.0 provides a unique solution.HistorySpeech intelligibility relates to the sound intensity modulations in the talker’s voice, as ...

  • Noise in the Animal Shelter Environment: Building Design and the Effects of Daily Noise Exposure

    Sound levels in animal shelters regularly exceed 100 dB. Noise is a physical stressor on animals that can lead to behavioral, physiological and anatomical responses. There are currently no policies regulating noise levels in dog kennels. The objective of this study was to evaluate the noise levels dogs are exposed to in an animal shelter on a continuous basis and to determine the need, if any. ...


    By Troy Acoustics Corporation

  • Bird Netting vs. Bird Spray

    There are many types of bird control methods, ranging from simple scarecrows to bird sound machines. Two of these methods include bird netting and bird spray. Learn more about each method to determine which method is best to keep pest birds away from your property. Bird Netting Bird netting is known to be an effective bird control, but there are many factors to consider before ...


    By Avian Enterprises, LLC

  • World class acoustics on the waterfront

    This opera house balances the intimate and the very loud.” The guest conductors, opera directors, music staff and the chairman of the orchestra were equally delighted with the sound achieved. English consulting company Arup Acoustics, responsible for the design of the new opera house’s acoustics, chose ODEON modelling software for this and for many of its other major projects within ...

  • World Class Indoor Acoustics

    On January 15th, 2005, the $440 million, new Copenhagen Opera House opened with a Royal Command Performance and the tones of Carl Nielsen, Donizetti, and Rossini. Likening the sound to the gift of a Stradivarius, the Royal theatres musical director was thrilled. It is a world class acoustic he commented, that at the same time is analytical, warm and round. Every subtlety, even the very quietest, ...

  • How LG Sonic ultrasound technology controls algae

    Controlling algae with low-power ultrasound is a well-established technology that has been in existence for many years. It is an environmentally-friendly technology that is harmless to fish and plants. This article explains how ultrasound controls algae, including the five most common questions related to ultrasonic algae control. Ultrasonic algae control Algal blooms cause ...


    By LG Sonic

  • Protect Your Pumpkin Patch From Pest Birds

    As the leaves begin to change colors and temperatures drop, more and more pumpkin patches are opening for business. Don’t let pest birds ruin the season you’ve waited all year long for. Keep your pumpkin patch safe from pest birds with these tips from Avian Control. Scare Away Pest Birds Stop ...


    By Avian Enterprises, LLC

  • Canarina CUSTIC software · noise abatement modeling · noise analysis · introduction 7

    The intensity of two sounds L1 and L2 can be added in decibels with the standard equation: LdB=10 log[(p1/p0)2+[(p2/p0)2] and then, LdB=10 log[10L1/10+ 10L2/10] In this way, ...

  • A new DIRAC measuring speech intelligibility

    History   Speech intelligibility relates to the sound intensity modulations in the talker’s voice, as described by Houtgast et al. [1]. This principle is used to determine speech intelligibility from the remaining modulation at a receiver position, using a modulated noise source at the talker position. The noise spectrum represents that of a human voice, and modulations at ...

  • Noise measurement in the fast lane! - case study

    Due to the nature of the Vehicle and Operator Services Agency (VOSA) work, noise is an inevitable by-product of its daily activities. Consequently to ensure the welfare of both its staff and the community in which it operates, VOSA undertakes regular noise assessments to ensure that the relevant regulations are being adhered to, thereby protecting both the environment in which it operates as well ...


    By Cirrus Research plc

  • Environmental Noise

    Introduction The ability to hear sounds is a sensory function vital for human survival and communication. However, not all sounds are wanted. 'Unwanted sounds', for which the term 'noise' is normally used, often have their origin in human activities (mainly transport, industry and households). This article addresses environmental noise ­ also referred to in the scientific literature as ...

  • Algal bloom causes and prevention

    Algal blooms are also known as marine blooms or water blooms, and are actually a sudden increase in the population of algae in water scenery. Algal blooms usually take place in freshwater, such as lakes and water reservoirs as well as in marine milieus. They can be easily identified by coloration of the water ensuing from the high density of pigmented cells. Though many types of algae can form ...


    By LG Sonic

  • Assessment and Reporting on Soil Erosion

    Untitled Document This report presents the results of a peer review of work on soil erosion carried out by the EEA up until 2001. It also summarises the conclusions of an expert ...

  • Online analyser for heavy metals: SEIBOLD Composer

    SEIBOLD COMPOSER Analyser can perform continuous analysis of heavy metals in water. The colorimetric analysis - stated by the WHO as reliable and best fitting method for online analysis - is used for reliable and accurate results and low total cost of measurement (TCM). Parameters: Aluminium Al (*) Arsenic As Cadmium Cd Cobalt Co ...

  • Implement Science based GHG reduction targets using four simple levers

    Antea Group has caught a view onto the horizon and what we see coming is a concerted effort on the part of businesses to take responsibility for their GHG emissions. An important step towards realizing this vision is establishing ambitious science based targets for reduction to 2020 and beyond.   What Are Science Based Targets? Until now greenhouse gas ...


    By Antea Group - USA

  • The Use Of UV For Dechlorination

    For many years chemical disinfection techniques have been used to provide microbiologically pure water for industrial and domestic use. Free chlorine, typically introduced by municipal water treatment plants in gaseous form, has been employed for many decades as a primary oxidising agent for the control of microbiological growth. Free chlorine can also be introduced through the injection of ...

  • Cave Detection: Testing the Industry’s First Electrical Resistivity Imaging Instrument - Case Study

    AGI first tested the Sting—the predecessor to the SuperSting instrument—in October 1994. This data set began the electrical resistivity imaging industry. Background In 1993, the Sting instrument was created—but ...


    By Advanced Geosciences, Inc.

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