Site Acoustics turns an equipment layout into a clear, A-weighted noise map and per-receiver sound levels in seconds — on a propagation engine validated against the official ISO reference cases to ≤ 0.04 dB.
Load a site export or build from scratch, give each piece of equipment a sound-power spectrum, place the screening — and compute the field, the per-receiver levels, and each group's contribution.
A per-octave ISO 9613-2 engine, validated against the official ISO/TR 17534-3 reference cases to ≤ 0.04 dB on the A-weighted total.
Draw sources, walls, buildings, berms and receivers on a site plan; change a setting and recompute the whole field in seconds across all your CPU cores.
A project bundles geometry, spectra, settings, the site-plan picture and terrain into one portable file. Your data never leaves your machine.
Colour A-weighted field with contours, legend and units, drawn over your own site-plan image.
Total level and per-group breakdown at each receiver, labelled on the map in dB or dB(A).
Point, line and area sources; walls, buildings, berms, foliage, tanks and receivers — drag, reshape, edit.
Pick a wall type and it applies the octave reflection, acoustic kind and a matched build cost in one click.
Right-click a receiver to draw every source path, colour-coded clear / screened / at-cap.
Record measurements or import a logger CSV, see the residual on the map, calibrate to fit in one step.
Rating-level with character corrections, an Annex C tonal screen and the excess-over-background band.
One-click Strict ISO 9613-2:2024 or CCi-Recommended enhancements; every option also a single toggle.
PNG / PDF / SVG maps and detailed CSV results, including a per-source, per-octave breakdown.
Site Acoustics implements ISO 9613-2 on a per-octave basis (63 Hz – 8 kHz), then A-weights and energy-sums to the overall level — following both the 1996 method and the 2024 revision where they differ.
| ISO 9613-2:1996 / 2024 | Core outdoor propagation: geometric divergence, ground effect, barrier screening, directivity, foliage and meteorological correction. |
|---|---|
| ISO 9613-1 | Atmospheric absorption coefficients, driven by the temperature and humidity set in Meteorology. |
| ISO/TR 17534-3:2015 | The official software-validation test cases used to verify the engine. |
| BS 4142:2014+A1:2019 | Industrial/commercial rating-level assessment, including the Annex C tonal-prominence screen. |
| Supporting references | Directivity cross-checked against CadnaA conventions (VDI 3733 / ÖAL 28); methodology compared against CNOSSOS-EU. |
The engine is checked against an independent reference implementation and two established commercial solvers, with the results frozen as automated regression gates that run on every change.
Official cases T01–T19 with certified per-band and total levels, tolerance ±0.05 dB, scored against an independent reference engine.
DataKustik solver as oracle — barrier Abar, directivity Dc, line/area discretization and meteorological correction, isolated one mechanism at a time.
Whole-site receiver levels and around-corner lateral paths compared on live engineering jobs, locked as regression gates.
Probst / Parzych synthetic cases gate grazing-floor, bright-zone and sub-wavelength screening behaviour.
The distinctive parts, described at a conceptual level — the exact formulations and implementation are proprietary.
Every interaction is evaluated band by band, so frequency-dependent ground, air absorption and screening fall out of the physics rather than a broadband approximation.
Barrier diffraction includes the paths bending around a wall's free ends — and optionally around building corners — so broadside receivers read correctly instead of several dB low.
Reflections appear only where a real specular bounce lands on a surface, weighted by how acoustically large that surface is — so short walls fade out instead of over-contributing.
A strict standards-traceable mode, plus a downwind-transition mode for open, grazing and far-field layouts. The active profile is recorded on every export.
An explicit, validated relaxation lets just-breaking-the-sight-line screening decay with distance and frequency, matching modern reference behaviour.
One choice sets the full octave reflection spectrum, the acoustic kind and a matched build cost — keeping acoustics and cost consistent with the design decision.
Because propagation is linear in decibels, a source group's sound power is back-calculated directly from a measured level — exact, not iterative.
The whole-area map is computed across all CPU cores, so trying another layout is a few-second round trip, with a live progress indicator.
A validated ISO 9613-2 engine, a drawing canvas, and exports your client will understand — running offline on your machine.