Traditionally walls are used for blocking noise. While completely they will not prevent transfer of noise from a side to another, walls will lessen its volume when it passes through. The Sound Transmission Class (STC) rating of the wall denotes how well it lessens airborne noise. The rating of this must be “real-world” instead of lab-tested. The interior windows and doors STC rating must at least comply with the wall standard.
But, blocking includes more than walls since not only does noise travel via air; also it can pass via, over, around, and under obstructions, and through ways of penetrations. Structural elements, like ventilation ducts, should be properly located and treated for preventing cross-talk from one room to another. To the doors addition of sweeps or gasket material can be done based on the speech privacy level required while they are closed.
Also blocking of noise transmission can be done via a layout well-planned. Make sure machines (e.g. ice dispensers or medication) and areas of high-activity are alienated from areas needing quiet, like patient rooms.
Majority of people know at least few factors of these initial two strategies and suppose they will attain the preferred levels of noise control and speech privacy if they just build “adequate” walls or provide “sufficient” absorption. This viewpoint is typically connected with the opinion that efficient acoustics can only be attained when in the space the general volume is low to the maximum extent possible.
But, similar to other ergonomic factors like temperature and lighting, actually there is a zone of comfort for the sound volume. This zone of comfort can be attained by regulating the noise floor. This is the level of constant background sound characterizing the space. If this floor is low it is easier to hear noises and conversations, also those that are comparatively less in volume or emerge at a significant distance from the hearer.
Providing a more consistent and higher baseline level of volume can effortlessly be attained by installing a system of sound-masking in the space. This is the least understood or known method of noise control, though extensively it has been used for decades, mainly in commercial offices.
A system of sound-masking comprises of loudspeakers in series, installed in a pattern like a grid over the ceiling, and a process of controlling their output and zoning. The sound distributed by the loudspeakers is unobtrusive and continuous, preserving the noise floor at a proper volume. When correctly implemented, it is very effective at concealing speech. Any noises lower than the masking sound level is also covered up. Besides, it lessens the impact of boisterous noises by decreasing the extent of change of volumes from baseline to peak.
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