AURIS™ is noise modelling software for acoustic consultants: ISO 9613-2:2024, CRTN, CRN, BS 5228 and BS 4142 in one fast, native app. Officially distributed by Polaris Acoustics.
Trace roads, railways, plant, buildings and barriers in a plan view that behaves like a drawing tool, not a spreadsheet.
Terrain, buildings and screening come to life in a real-time 3D view, so you can check the model the way a planning officer will see it.
ISO 9613-2:2024 divergence, atmospheric absorption, ground effect and screening over and around obstacles, alongside native CRTN and CRN for transport.
Contour bands draped over the terrain, receptor levels in plan and 3D, and sheets you can drop straight into a planning report.
Every screen below is the shipping desktop app, running a demonstration site. Plan, 3D, contours and results, all in one window.
The plan editor: draw sources, buildings and barriers, then see receptor levels appear in place after each calculation.
Move a barrier and recalculate the receptors in seconds on a site like this one. The solver spreads work across every core and the 3D view follows the model as you build, so options get tested in the meeting, not after it.
Each one with published checksums and a packaged smoke test, delivered through the in-app updater.
Survey points or grids become terrain that every path is cut against, with berms modelled as earthworks rather than walls.
474 plant entries, each read three independent ways from the standard and rebuilt byte for byte, ready to drop onto a site.
Legends, scale bars, north arrows and your branding laid out for you, exported as PDF, SVG or PNG.
Most of a consultant's week is spent inside software designed for a different decade. AURIS™ starts from how the work is actually done, and from what a reviewer will ask to see.
A single number at each receptor, and a long afternoon if anyone asks where it came from.
Why this level? Any ISO 9613-2 receptor level opens up term by term: divergence, air, ground, screening, the sources that dominate and what changes if one goes.
Contour plots redrawn in another package before they are fit for a report.
Report sheets with legend, scale bar and north arrow, exported straight to PDF, SVG or PNG.
Validation promised in a brochure, without the cases, the tolerances or the misses.
The control examples, the tolerance and the one case that differs, published on this page.
Results that shift quietly between versions.
Frozen reference results: if a code change moves any of them, by any amount, the release stops.
Editing a site through dialog boxes and tables.
A plan editor that behaves like a drawing tool, with the 3D model a click away.
Implemented from the published texts, written up method by method, and checked against each standard’s own worked examples wherever it publishes them.
Geometric divergence, atmospheric absorption, ground effect and barrier attenuation for industrial plant, fixed equipment and general sources, including lateral paths around obstacles.
Native CRTN with flow, speed, percentage heavy vehicles, gradient and surface corrections, screening and angle of view, from 18-hour flows to night-time estimates.
Train classes, speeds and movements by period, track corrections and screening, worked through segment by segment to receptor levels.
The Annex C plant library built in and verified, so construction noise predictions start from the levels the standard publishes.
Specific, rating and background levels side by side, with the context a BS 4142 assessment needs at each receptor.
Acoustic software is only as good as its worst case, so here is ours. These are AURIS™ results for the ISO/TR 17534-3 control examples for ISO 9613-2, every octave band, against the published reference values.
| Case | Scenario | Largest difference, dB | Result |
|---|---|---|---|
| T01 | Hard Ground | 0.009 | Within ±0.5 dB |
| T02 | Mixed Ground | 0.008 | Within ±0.5 dB |
| T03 | Soft Ground | 0.009 | Within ±0.5 dB |
| T04 | Mixed Ground Zones | 0.012 | Within ±0.5 dB |
| T05 | Simplified Ground | 0.007 | Within ±0.5 dB |
| T06 | Variable Terrain | 0.011 | Within ±0.5 dB |
| T07 | Variable Terrain Simplified Ground | 0.011 | Within ±0.5 dB |
| T08 | Long Barrier | 0.272 | Within ±0.5 dB |
| T09 | Short Barrier | 0.264 | Within ±0.5 dB |
| T10 | Variable Terrain + Short Barrier | 0.148 | Within ±0.5 dB |
| T11 | Cube + Low Receiver | 0.118 | Within ±0.5 dB |
| T12 | Cube + High Receiver | 0.232 | Within ±0.5 dB |
| T13 | Prism + Low Receiver | 0.069 | Within ±0.5 dB |
| T14 | Variable Terrain + Prism | 0.065 | Within ±0.5 dB |
| T15 | Prism + High Receiver | 0.231 | Within ±0.5 dB |
| T16 | Three Buildings | 0.050 | Within ±0.5 dB |
| T17 | Three Buildings Alt S/R | 0.039 | Within ±0.5 dB |
| T18 | Complex Building Courtyard | 0.068 | Within ±0.5 dB |
| T19 | Variable Terrain + Reflective Barrier | 2.228 | Outside: documented edition difference |
ISO/TR 17534-3 cases T01 to T18 within ±0.5 dB in every octave band, checked at every release
largest difference among those cases (T08, 500 Hz)
largest difference from a separate in-house solver across 15 benchmark scenarios
automated tests across the engine, file handling and interface
T19 differs by 2.23 dB at 250 Hz. The original reference table follows ISO 9613-2:1996 and leaves out a 250 Hz ground term that Formulae (26) and (27) of the 2024 edition admit. It stays in the suite as a documented diagnostic, untouched.
CRTN Annex worked examples 2 to 18 and CRN Appendix A2 worked examples 2 to 14 run through the same code path you use, not a test copy of it. CRN is held to 0.11 dB mean and 0.35 dB worst-case error.
An independent implementation, written so it cannot import a line of AURIS™ code, recalculates ISO 9613-2 point, line and area sources, CRTN and CRN cases. The two agree to within 0.085 dB.
Seven reference scenes and their contour grids are frozen. Any change that moves a frozen result, by any amount, fails the release.
Each method is checked two ways: against the worked examples its own standard publishes, and against a separate solver that shares no code with AURIS™. Geometric divergence, atmospheric absorption, ground effect and barrier attenuation are compared term by term, not only as a final level.
| Method | Published examples | Independent scenarios | Largest difference | Limit applied |
|---|---|---|---|---|
| ISO 9613-2, point sources | ISO/TR 17534-3 T01 to T18, within ±0.5 dB | 3 of 3 | Below 0.000001 dB | 0.000001 dB |
| ISO 9613-2, line sources | Covered by the independent solver | 3 of 3 | 0.085 dB | 0.05 to 0.1 dB |
| ISO 9613-2, area sources | Covered by the independent solver | 3 of 3 | 0.012 dB | 0.05 to 0.1 dB |
| CRTN 1988, road | Annex examples 2 to 18 | 3 of 3 | 0 dB | 0.01 dB |
| CRN 1995, rail | Appendix A2 examples 2 to 14 | 3 of 3 | 0.007 dB | 0.01 dB |
We have not published a same-input benchmark against another commercial noise modelling package. A comparison only means something when traffic, geometry, calibration and output index are identical, so we will not quote one until that exists.
AURIS™ does not yet claim a formal ISO 17534 quality declaration. Validation records are issued by the developer, not a third party.
AURIS™ is developed for the UK market first: the methods planning officers and Environmental Health ask for, in one model, with the people who build it a message away.
CRTN, CRN, BS 5228 and BS 4142 alongside ISO 9613-2:2024, sharing one site, one terrain and one set of receptors.
Early-access consultancies report problems straight to the development team. Fixes arrive through the in-app updater, not next year’s release.
Built for Apple silicon, not a browser tab or a remote desktop. A Windows installer is in preparation.
We use AURIS™ on our own planning work. We chose to distribute it because it shows its working: any ISO 9613-2 level can be opened up term by term, and the validation is published, including the case that does not match.Polaris Acoustics, official AURIS™ distributor
AURIS™ is opening to a small group of UK acoustic consultancies. Tell us about your team and the work you do, and Polaris Acoustics will be in touch.
Use AURIS™ on live projects ahead of general release.
Your feedback goes straight to the development team.
A walkthrough on one of your own sites with Polaris Acoustics, the official distributor.
It takes under a minute. We never share your details.
AURIS™ is environmental noise modelling software for acoustic consultants, officially distributed by Polaris Acoustics. It predicts sound levels from industry, roads, railways and construction across real terrain, buildings and barriers, then turns the results into receptor tables, 3D views and noise contour maps for planning reports.
ISO 9613-2:2024 for outdoor sound propagation, the Calculation of Road Traffic Noise (CRTN), the Calculation of Railway Noise (CRN) and the BS 5228-1 Annex C construction plant library, with a workflow for BS 4142 assessments.
Every octave band of ISO/TR 17534-3 control examples T01 to T18 is checked to within ±0.5 dB as part of the release gate. CRTN Annex worked examples 2 to 18 and CRN Appendix A2 worked examples 2 to 14 run through the same code path consultants use. A separate in-house solver that cannot share AURIS™ code agrees on 15 benchmark scenarios to within 0.085 dB, and frozen reference results stop a release if they move.
ISO/TR 17534-3 provides control examples rather than a certificate. AURIS™ reproduces T01 to T18 within the ±0.5 dB result intervals. T19 differs by 2.23 dB at 250 Hz from the original 1996-based reference, which we publish rather than hide. AURIS™ does not yet claim a formal ISO 17534 quality declaration.
Polaris Acoustics is the official distributor of AURIS™. Polaris is a UK acoustic consultancy and uses AURIS™ on its own planning work.
AURIS™ is a native desktop app for Apple silicon Macs. A Windows installer is in preparation.
AURIS™ is opening to a small number of UK acoustic consultancies. Register your interest on this page and Polaris Acoustics will be in touch about early access.