![]() The Noise Criteria (NC) specifies the maximum noise levels that can be present in each octave band of noise to meet a specific Noise Criterion. To compensate for the differential frequency sensitivity of the human ear, the criteria for the noise threshold needs to be defined for each frequency band. Human perception of noise at different frequencies is very different. Isolating the noise from external sources and ensuring internal noises are low is essential for providing an acceptable acoustic environment within a building. Indoor spaces are subject to several noise sources, including internal sources such as noise from an air conditioning unit or external sources such as road noise. It is important that the background noise levels are within acceptable limits to ensure optimal speech communication for structures ranging from residences and offices to hospitals and schools. ![]() Noise Criteria (NC) curves are primarily used to rate indoor noise levels.
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