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(g) Fixed and upholstered seating (for efficient absorption of sound) (f) Soft floor finish (particularly along the aisles) (e) Short reverberation time (as required in auditoria for speech) (d) Steeply-tiered seating arrangement and raised dais (c) Treatment of ceiling for reflection and dispersion of sound (a) Greatest economy in floor area and volume Primary requirements for the design of such public buildings from the point of view of good acoustics are as follows: In such cases, acoustic treatment can only partially remedy the situation, particularly if the hall is large and has a high ceiling. Their original design may have paid little or no attention to acoustical requirements and, consequently, speech intelligibility may be very poor. Similar noise levels are usually found in hotels, auditoria, concert halls, theatres and churches although each of these establishments has its own individual requirements as discussed in the following sections.Īssembly halls, chambers, theatres and other public buildings may have similar requirements to office buildings with respect to satisfactory background noise levels but the former require additional attention to acoustic design. They interfere with enjoyment recreation or leisure-time pursuits in the home. High levels of background noise in domestic dwellings are the main sources of annoyance. Schools and hospitals, which may be classified as public buildings, have special requirements, however, with respect to background indoor noise. Noise levels in offices and commercial buildings, on the other hand, can interfere with verbal communication as well as working efficiency. They can interfere with the efficiency of working, or even be damaging to hearing. Noise levels found in factories and workshops are generally high.
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Indoor noise not only sets the background noise level inside the building, but also can be intrusive on the occupants of adjacent rooms or dwellings.įrom the point of view of indoor noise, buildings may be classified under the following three categories: This is the noise generated within the buildings themselves. Simple measurements, with sound level meters, corresponding to these categories are given in Table 1. The background noise belonging to the fourth category (i.e., “unbearable”) is almost certainly damaging and seriously interferes with working efficiency. machine shops but noise control treatment will result in some improvement in efficiency even in such cases.
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Suitable location and/or special treatment may usually be necessary to produce conditions in offices demanding concentration at work.īackground noise belonging to the third category (i.e., “very noisy”) may even be acceptable with certain occupancies, e.g. In busy buddings, most rooms probably fall into the “noisy” category. In Layman’s language, the background noise levels may be classified as: The main difference between a single- number rating and a compounded rating is that the latter is more completely adjusted to take into consideration the frequency content of the noise. The level of such acceptable background noise varies with the type of budding and its occupancy.Īcceptable noise levels may be expressed in single number noise level values, or in compounded parameters. The “acceptable” noise level may loosely be defined as the level of background noise at which the noise is not considered by the individual to be obtrusive, and does not interfere with his or her working efficiency. Excessive background noise, however, can reduce the individual’s concentration and efficiency and, at even higher levels, can cause damage to hearing. In normal daytime hours, moderate noise is generally acceptable in buddings since it has come to be regarded as inevitable in this industrial era. After reading this article you will learn about:- 1.