Sound masking system
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Sound masking systems (maybe more commonly though less-accurately known as "white noise" systems) are systems that generate sounds in order to mask (or hide) other sounds, typically human speech. These systems are usually employed in offices and lecture theaters. There are two types of sound masking systems - in-plenum systems and direct field systems.
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[edit] In-plenum
In-plenum sound masking systems consist of large, paint can-like loudspeakers installed above the ceiling tiles. Sound is bounced off the ceiling deck, through the ceiling tiles into the workspace below. The sound can be unpredictable and louder for the same level of speech privacy. These systems require tuning by acoustic professionals. Often, these systems create “hot” spots where unwanted masking noise spills into unintended spaces such as private offices. In-plenum systems have been around since the 1960’s.
[edit] Direct-field
Direct field sound masking systems are relatively new to the market and are installed directly in the workspace to avoid having sound interfere with elements above the ceiling tile. The result is a quieter, less obtrusive sound that masks speech at the same level as in-plenum systems. Direct-field systems are simpler to install and require less tuning than in-plenum sound masking systems. Direct field sound masking can still work with a ceiling that does not have ceiling tiles. Sound masking emitters may be embedded in furniture or other fixtures.
[edit] See also
- Sound masking
- Architectural acoustics
- Noise health effects
- Noise mitigation
- Noise Reduction Coefficient
- Noise regulation
- Concert hall acoustics
