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Title
Bring back the numbers.
Abstract
The article discusses the mathematical equation of deriving the noise and number index (NNI) of aircraft sound. The equation could be achieved by adding the average peak value to the movement of an aircraft. In addition, the use of perceived noise level (PNdB) could cause complexity in the computation, which then could lead to the abandonment of NNI. Moreover, the problem with complexity was given a solution due to the availability of microprocessor sound level meters.