Sound Level Monitoring Articles

  • What is reverberation time and how it is calculated?

    What is the reverberation time of a room? Reverberation time is the time required for the sound to “fade away” or decay in a closed space. Sound in a room will repeatedly bounce off surfaces such as the floor, walls, ceiling, windows or tables. When these reflections mix, a phenomeon known as reverberation is created. Reverberation reduces when the reflections hit ...


    By Cirrus Research plc

  • Jersey Opera house puts Optimus Red in the spotlight - Case study

    When the audience sits in the beautiful auditorium of Jersey Opera House, they have very little idea of the technology that goes into giving them the ultimate live show experience. Whether they have come to see stand-up comedian Kevin Bridges or a full stage production of New Jersey Nights, the quality and right level of sound are absolutely crucial. Jersey Opera House Technical Manager Chris ...


    By Cirrus Research plc

  • Planning to perfection! Cirrus Research helps The Banks Group to keep at the forefront of noisemeasurement

    With the experience of over 35 years in land development, The Banks Group continues to develop land throughout England and Scotland for a variety of uses including surface coalmines, onshore wind farms, commercial and residential property schemes and sustainable wastemanagement facilities.With the aim of being one of the UK’smost successful land developers, it comes as no surprise that the ...


    By Cirrus Research plc

  • Sound Level Meter Apps – How Accurate Are They?

    There has been a growing awareness of the availability and application of sound level meter apps providing noise measurement functions. Some of these sound level meter apps have been designed to meet, when used with a suitable external microphone, compliance with the relevant instrumentation standards. The vast majority of these are available as free downloads from the Google Play Store or the ...


    By Cirrus Research plc

  • New Dates for the Cirrus Training Courses for 2017 & 2018

    Due to popular demand, we’ve added more dates for our Cirrus Product Training Courses and our new Environmental Noise Measurement Workshop. Get the Best from Your Cirrus Noise Measurement Equipment Once you’ve purchased your Cirrus sound level meter or doseBadge kit, you’ll want to get the best from it and make sure that you’re using it to its full ...


    By Cirrus Research plc

  • When Sound Becomes Noise

    Music to the ears of some can equally be perceived as unwanted, irritating noise to others – as illustrated by a recent news article about a Sydney pub forced to cancel live music on Sunday afternoons after five trouble-free years ...


    By Innova Global Limited.

  • Designing that unique Ferrari sound using NVH Simulation

    Our NVH simulation technology enabled Ferrari to perform virtual evaluations of alternative design decisions in an interactive, free-driving scenario. Ferraris are distinguished by a unique sound that is as carefully tuned as a piece of music. Creating this characteristic sound authentically and yet keeping it within legal limits requires careful component design and selection. Our NVH ...

  • Sound Absorption for All Saints Church Community Centre

    Acoustic specialists, Sound Reduction Systems (SRS Ltd) were approached by All Saints Church with a view to treating the poor acoustics within their community centre. They had recognised that high levels of reverberation and echo were affecting the various groups that used the space, and were looking for a solution that was both effective and decorative. Initially, Mr Les Munns (Church Building ...


    By Sound Reduction Systems Ltd

  • Innova`s race against time; the sonic mystery

    What began as a puzzling mystery in the semi-arid scrub-land of Colorado, ended as a race against time for the acoustic specialists of INNOVA (formerly ATCO Noise Management). The Olathe Compression Station, operated by Kinder Morgan’s TransColorado Gas Transmission, is located on a plateau in isolated, canyon-cut Colorado countryside, three km from the nearest ...


    By Innova Global Limited.

  • Utilising the Strengths of Different Sound Sensor Networks in Smart City Noise Management

    City noise management involves a variety of disciplines such as planning, mapping, action plans, policing, complaint management, abatement and public awareness. With the wide availability of mobile broadband internet access coupled with low cost noise sensors, many authorities and researchers are eager to use sound sensor networks for these tasks. A sensor network can be defined as a group of ...

  • Optimus and Invictus are the Classic Combination - Case Study

    Imagine a perfect summer’s evening with a 40-strong classical orchestra playing to an appreciative audience in a leafy green park. So far, so very English. Add in the fact the Park is in the heart of Lancaster city surrounded by thousands of homes and the orchestra is playing sets of the Hacienda’s classic 90s house music hits and you can understand the headache facing Acoustic ...


    By Cirrus Research plc

  • Optimus and doseBadge Adapt to New Challenge - Case Study

    Established in 1934, Lindapter International is the world’s innovator of steelwork clamping systems, eliminating the requirement to drill or weld steel.  The company designs and manufactures specialist products for connecting structural steel sections together and  has more than 85 years’ experience in its field. The company’s success is the result of its dedication ...


    By Cirrus Research plc

  • How to Set Up an Outdoor Sound Monitoring Kit

    What do demolition sites, construction, industrial and mechanical equipment, outdoor events, transportation facilities, traffic, and air crafts have in common? They all cause noise pollution. Environmental noise can cause adverse effects to those around it which is why it is critical monitor. At RAECO Rents we make outdoor sound monitoring easy! ...


    By Raeco Rents

  • Are Those Inexpensive iPad Sound Measurement Apps Any Good?

    Are those inexpensive iPad sound measurement apps any good? Are they as accurate as a properly calibrated $2,000 type 2 sound level meter? Let's review three separate studies, and an article: Study #1 In early 2014, NIOSH reviewed 192 sound measurement apps. NIOSH concluded, ...

  • Case study - Filming sound leakages in highly reflective office environment

    Problem A newly built office complex is designed with glass facades between the offices and the hallway. The glass facades include a glass door. Although the glass structures themselves have a sufficient sound reduction value, the sound insulation between office and hallway was measured at 19 dB, which was far below the sound insulation criteria for offices given in the regulations. It was ...


    By Norsonic AS

  • Ask The Noise Doctor: How Long will the Batteries Last in My Optimus Sound Level Meter?

    Do you have questions about your noise measurement instruments that Google or Wikipedia just can’t seem to answer? Ask The Noise Doctor. I’m here to answer your most frequently asked questions. Whether it’s product or application based, I’m up to the challenge. In this article I’ll be covering battery life in the Optimus Sound Level Meter range. A Commonly Asked ...


    By Cirrus Research plc

  • Case study - Measuring impact of traffic noise in apartment living room

    Problem An apartment on the ground floor of a two story house in the city lies close to a busy road. The living room in the apartment is facing the road, and the inhabitants are bothered by traffic noise, especially in the morning and the afternoon, when the traffic is the heaviest. Traffic noise could be clearly heard when standing in the living room. The facade facing the city ...


    By Norsonic AS

  • Listening In: Smartball Detects Ancient Buried Sounds

    For this leak detection survey, Pure’s innovative free-swimming acoustic tool gathered critical information about the aging pipeline assets of this historic Arabian city. This large public utility supplies bulk water to this bustling, historic resort city located in the Arabian Penninsula region. The city’s infrastructure – above ground and below – ...

  • Recording audio with level triggers - Sound Level Meters

    Recording audio from a sound level meter measurement is sometimes necessary. Perhaps you need to listen to identify the source of a noise or for post-processing – or even to play back to a project stakeholder. If a measurement is short, it’s easy enough to record audio for an entire measurement and afterward crop the relevant parts. However, measuring for days, weeks or months, ...

  • Case study - Using acoustic camera inside caravan car to find squeak and rattle noise

    Problem When driving a caravan car, the driver could hear annoying noises from behind the driver’s cab in the living compartment. Even though the noises could be heard clearly, it was very difficult to discover the exact location and cause of the various annoying sounds due to overwhelming background noise. When the car was standing still with the engine running, no extra ...


    By Norsonic AS

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