Aviation Terms->

Effective Perceived Noise Level (EPNL)

EPNL measurements consist of a frequency weighting scheme considerably more complicated than the A-weighting filter used to determine SELs. They incorporate a penalty for the presence of pure tones to account for people's increased annoyance with single frequencies, such as the tones emanating from the compressor of turbofan engines. Thus, although specific values must be determined by computer analysis of a signal, EPNL has been adopted for certain specialized uses involving the noise of individual over-flights.

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