Note: Many different levels with a number of different weightings are in current use, and care must be taken to ensure that the proper parameters are stated.
Transportation vehicles are the worst offenders, with aircraft, railroad stock, trucks, buses, automobiles, and motorcycles all producing excessive noise.
One burst of noise, as from a passing truck, is known to alter endocrine, neurological, and cardiovascular functions in many individuals; prolonged or frequent exposure to such noise tends to make the physiological disturbances chronic.
Noise is recognized as a controllable pollutant that can yield to abatement technology.
Broad-band noise removal based on non-linear spectral subtraction of the measured noise spectrum (derived from a referencenoise input via a separate channel).
The simplest form of spectral subtraction is to, literally, subtract the averaged noise spectrum from the noisy signal spectrum, on a point-by-point basis in the frequency domain.
The noise spectrum is estimated from the average of the left and right channels of the second input.
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