GMIS - Acoustic Calculator delivers fast, consistent, fieldgrade computations for acousticians and environmental noise professionals.

What’s inside:
• Fundamentals: Wavelength, Frequency, Speed of Sound, Acoustic Delay, Directivity Index, Doppler Effect, Acoustic Impedance, Blade Pass Frequency, Bragg’s Law, Coincidence Frequency, Mach Number, Noise Exposure & Allowed Time, Needed/Potential Acoustic Gain.
• Decibel tools: dB calculator; SPL / SWL / SIL.
• Quantifying noise: Ldn, Lden, SEL, NPL for standardized assessment.
• Outdoor propagation: SWL↔SPL (full/spherical/hemispherical), distance attenuation; point/line/plane source models; barrier attenuation.
Designed for experts: fast input, metric units, fieldfirst UX. Onetime purchase, no ads, offline logic.