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noise propagation Applications

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    Noise monitoring solutions for room acoustics

    Room Acoustics concerns the way sound is created, propagated, perceived, measured and modelled inside enclosures. Enclosures can be dwellings, offices, workshops, factory halls, lecture rooms, auditoria, concert halls, transportation terminals, etc. Reverberation Time is the single most important parameter used to describe Room Acoustics, but in addition, parameters describing music quality and speech inteligibility are important.

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    Sound Instrumentation for Building Acoustics

    The field of building acoustics consists of two parts; Room Acoustics which deals with sound propagation in a room and Building Acoustics, which deals with sound propagation between rooms. Typically, room acoustics is related to the quality of sound, e.g. concert hall acoustics, while building acoustics is more related to unwanted sound, i.e. when you want to hear as little as possible of what is going on in adjacent rooms. From a measurement technology point of view, the two have a lot in common which shall be outlined here.

    By Norsonic AS based in Lierskogen, NORWAY.

  • noise3D online

    noise3D online enables commercial and industrial users to assess noise levels with the latest available propagation programs, without having to purchase expensive software. Instead, the 3D modeling software Trimble Navigation SketchUp or Google Earth (Pro) are used as interface. You can use your own planning documents, such as scanned maps for digitization, or transfer data from Google Earth for a simpler option.

    By Sonja Christiansen Informatik GmbH (SCI) based in Sankt Augustin, GERMANY.

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    Sound Insulation solutions for building acoustics

    Sound energy does not remain in the room where it is produced, but propagates throughout the building by any available path, intruding into other rooms as noise. Each country has its own standards of sound insulation in buildings, but it is measured in the same way all over the world. The noise levels in the two rooms under investigation are measured and subtracted, and the level difference is corrected for the influence of the reverberation time and background noise level in the receiving room. The measurements and calculations are made in 1/1- or 1/3-octave bands and averaged over a number of positions in the rooms. Finally a single-number index is calculated by averaging over all the frequency bands.

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