Acoustic Tools Suite
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Add or subtract sound levels in dB/dBA.
Estimate level loss over distance.
Convert a 1/3-octave Lp spectrum to octave bands.
Convert a spectrum to dB(A)/dB(C) and compute weighted overall levels.
Measure a room RT (RT60): T20/T30/EDT per octave band, report and target comparison.
Estimate a room RT (RT60) via Sabine & Eyring: volume, materials, spectrum and targets.
Convert c ↔ λ ↔ f and compute the speed of sound in air and other media.
Estimate the sound reduction index R of a single panel: surface mass, critical frequency, Rw.
Compute the daily noise exposure LEX,8h over 8 h: multi-task, dose %, action values, peak.
Acoustic barrier attenuation (Maekawa) and received level: distance, ground effect, air (ISO 9613-2).