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sci.noise-barrier-insertion-loss Calculator
Calculates noise barrier insertion loss using the Maekawa formula from Fresnel number N = 2δ/λ, where δ is path length difference over the barrier. A 3 m high barrier with N = 1 gives insertion loss ≈ 13 dB — real highway barriers achieve 8–15 dB depending on source elevation, barrier mass, and ground type.
Inputs
H M
Vertical measurement. For health calculators, typically standing height without shoes.
D1 M
Separation between two points or total path length. Check that units are consistent throughout the calculation.
D2 M
Separation between two points or total path length. Check that units are consistent throughout the calculation.
Frequency Hz
Cycles per second (Hz). Audible sound: 20 Hz – 20 kHz. Make sure units match what the formula expects.
Results
insertion loss IL (dB)
The decrease or degradation from the baseline.
path difference δ (m)
The arithmetic difference between the two values.
Fresnel number N
Sample size or count used in the calculation.
IL = 10log(3 + 20N)
Sample size or count used in the calculation.
practical maximum
The largest value in the dataset or feasible range.
N interpretation
Qualitative summary of what the computed numbers mean in practical terms.