/ AREA · ACOUSTICS

Environmental and architectural acoustics, with instrumental rigour.

Survey, assessment, design and expert reports with Competent Technicians listed in ENTECA (no. 10798 and 12928). We build software for those who do acoustics, because we do acoustics.

Two Acoustics Competent Technicians listed in the Italian National Roll (ENTECA): no. 10798 (Veneto Region) and no. 12928 (Autonomous Province of Bolzano).

What an Acoustics Competent Technician does

The Acoustics Competent Technician (TCA) is the professional role recognised under Italian law for sound-level measurements, acoustic impact and ambient noise climate assessments, and the passive acoustic design of buildings. ST-LINE operates in acoustics with two Competent Technicians listed in the Italian National Roll ENTECA (no. 10798, Veneto Region, and no. 12928, Autonomous Province of Bolzano): the dual registration ensures operational continuity and interregional coverage.

ST-LINE acoustic workflow pipeline Four-stage diagram of the acoustic workflow: on-site instrumental measurement with a Class 1 sound level meter, data processing with spectral and statistical analysis, regulatory analysis against legal limits, and reporting with a technical report signed by a qualified acoustician. 01 62.4 Field measurement Class 1 sound level meter traceable calibration 02 Data processing spectral analysis, statistics, events 03 Regulatory analysis L. 447/95 · DPCM 14/11/97 UNI · ISO 1996 04 TCA Reporting technical report signed by qualified acoustician
The four stages of our acoustic workflow, from instrumental measurement to the signed report.

Why ST-LINE for acoustics

ST-LINE didn't start out as an acoustics specialist firm: it's a software and electronics development company that integrated acoustics as a specialist area, staffed by two Competent Technicians listed in ENTECA. That origin shapes how we approach acoustic work: we treat measurements as structured, versioned data, we build our own analysis tools when the market doesn't offer what we need (SoundPro), and we handle forensic cases with the rigour of those used to defending a technical dossier under challenge.

For the client this means three concrete things: full traceability of measurement data, interoperable delivery formats, and the response times of a small, direct technical team.

RaySound, our acoustic simulation engine

RaySound is the proprietary simulation engine we design room acoustics with. It is a hybrid engine: a wave solver in the modal band, a GPU ray-tracer in the diffuse band, and two capabilities that make it a design tool and not only a verification one — inverse design, which goes from the specification target to the surface treatment, and identifiability diagnosis, which states when the available data is not enough to support a calibration.

Room-acoustics design with RaySound →

SoundPro, our acoustic analysis environment

SoundPro is the software we process measurements with: acquisitions from sound level meters of different makes in a single project, descriptors computed to the Italian standards, and the report that follows without manual steps between instrument, spreadsheet and document. Today we use it internally, on our own commissions, and it is the reason our measurements reach the client as structured data rather than as retyped tables.

We are developing it for the acoustics competent technician as the end user: anyone doing this work knows the problem of proprietary formats and of the time spent reassembling data that comes from different instruments.

SoundPro: where it stands →

Services

01

Acoustic impact and ambient noise climate assessment

Estimation of noise emissions from fixed and mobile sources at the design and operation stages, with predictive simulations and on-site instrumental validation. Typical sectors: industrial, transport infrastructure, production activities, temporary events.

L. 447/95 (Italian framework law on noise pollution) · DPCM 14/11/97 · DM 16/03/98
02

Occupational noise exposure assessment

Measurement of noise levels in the workplace, classification of exposed workers, mitigation guidance and PPE. Typical sectors: industrial production, construction sites, laboratories, events.

D.Lgs. 81/08 (Italian consolidated workplace safety act) · UNI 9432
03

Passive building acoustic design

Calculation and verification of insulation, impact noise, reverberation and compliance with legal requirements. Typical sectors: residential, educational, healthcare, hospitality, tertiary.

DPCM 5/12/97 (Italian building acoustics requirements) · ISO 16283 / 717 · ISO 3382
04

Architectural acoustics and room-acoustics design

Reverberation, clarity and intelligibility in spaces meant for listening: per-band prediction, treatment sizing and on-site verification, with our proprietary RaySound simulation engine. Typical sectors: classrooms and school environments, auditoria, conference and meeting rooms, collective spaces.

UNI 11532-1/2 · ISO 3382-1 · IEC 60268-16 · Italian CAM DM 24/11/2025 See the service
05

Forensic-grade sound level measurements

Instrumental measurements in environmental, occupational and architectural contexts with a signed forensic technical report. Typical sectors: condominium disputes, administrative challenges, technical consultancy for court-appointed experts.

UNI · ISO 1996 · UNI 11367

Instrumentation and expertise

Noise propagation map: industrial point source, sound-absorbing barrier, three sensitive houses in the protected zone.
Example of noise propagation: industrial point source (Lw ≈ 110 dB), source building, sound-absorbing barrier about 4 m high, three sensitive buildings. Model with spherical divergence, atmospheric absorption and Maekawa diffraction over the barrier; LAeq isophones at 50/55/60/65/70/75/80 dB(A). Reconstructed didactic case, no real client data; diagram labels in Italian.
// PROPRIETARY SOFTWARE IN DEVELOPMENT

Acoustic analysis software born in the field.

Software for analysing and processing sound-level data for environmental acoustics.

We are developing proprietary software for analysing and processing sound-level data for environmental acoustics (in development). The same know-how in measurement, regulatory calculation and design moves from the field into the code — and back to technicians as a tool.

  • Native import from the formats of the main sound level meters and accelerometers on the market
  • Italian and European regulations integrated as versioned calculation modules
  • Open project format, automatic forensic-grade traceability
See SoundPro →
// REGULATORY REFERENCES

The standards in force for environmental and building acoustics

Italian statutes, ISO, IEC, UNI, plus ANSI/ASTM, DIN/VDI, BS and NF: for each one the edition in force, the scope, what it does NOT cover and — for recent editions — what changed against the previous one. With the official catalogue link and the sources that decide a dispute between private parties.

Open the references ↗
// STANDARDS UPDATE

ISO 9613-2: a draft amendment takes diffraction back to the 1996 formulas

ISO 9613-2:2024/DAmd 1 is out for DIS ballot and rewrites D_z and K_met in Clause 7.4 again, restoring the form they had in the 1996 edition; the ISO catalogue already carries the third edition in drafting. The formulas side by side, how much the numbers move band by band, the two errata in Annexes A and B, and what it means for anyone who has to state the edition in a report.

Read the analysis ↗

Tools we built for acoustics

Real client work produces open-source tools we publish so other technicians can use them. They are demonstrative — expert use needs a model adequate to the methodology and the responsibility of a qualified technician, which a program does not replace — but they embody our approach to acoustic computation.

See all tools ↗

Need an acoustic assessment?

Forensic-grade measurements, regulatory assessments, passive acoustic design. We reply within 2 business days.

Request an assessment See the other ST-LINE service areas