OSEN-Z-26 Directional Outdoor Audio System for Campus Sound Zoning and Classroom Acoustic Equalization

Overview

The OSEN-Z-26 Directional Outdoor Audio System is an engineered acoustic solution designed specifically for controlled sound delivery in multi-zone educational environments. Unlike conventional omnidirectional loudspeakers, this system employs parametric array technology and beam-forming transducer architecture to project intelligible audio within defined spatial boundaries—minimizing sound spill into adjacent areas such as classrooms, libraries, or residential zones adjacent to school campuses. It operates on the principle of ultrasonic carrier wave modulation, where high-frequency ultrasound (typically >40 kHz) is amplitude-modulated with audible-band audio signals; nonlinear interaction in air generates a narrow, low-divergence audible beam. This enables precise sound zoning—e.g., delivering morning announcements exclusively to the sports field without disturbing nearby science labs—while maintaining speech intelligibility (STI ≥ 0.65 at 25 m). The system complies with IEC 61672-1:2013 Class 2 requirements for integrated sound level monitoring functionality and supports real-time SPL logging per EN 61260-1:2014 octave-band analysis.

Key Features

• Directional audio projection with ≤15° horizontal beamwidth at 1 kHz, adjustable via digital beam steering interface
• Integrated Class 2 sound level meter (IEC 61672-1 compliant) with L_eq, L_max, L_min, and percentile (L₁₀, L₅₀, L₉₀) metrics
• Real-time acoustic equalization engine with 31-band 1/3-octave parametric EQ, auto-calibrated using built-in reference microphone
• Weather-resistant IP55 enclosure rated for continuous outdoor operation (−20 °C to +60 °C, 95% RH non-condensing)
• Network-enabled control via Ethernet (RJ45) and optional LTE fallback; supports SNMP v3 and HTTP/HTTPS RESTful API
• Onboard data logging (SD card slot) with timestamped WAV + CSV export for noise mapping and regulatory reporting

Sample Compatibility & Compliance

The OSEN-Z-26 is validated for deployment in open-field, semi-enclosed courtyards, and indoor gymnasiums where acoustic separation between functional zones is required. It accommodates standard audio input formats (AES3, analog line-level, Dante AVB optional) and interfaces seamlessly with campus-wide PA infrastructure. Regulatory compliance includes CE marking under EMC Directive 2014/30/EU and RoHS 2011/65/EU. For environmental noise assessment applications, the integrated sound level measurement function meets the technical criteria specified in ISO 1996-2:2017 (acoustics — description, measurement and assessment of environmental noise — part 2: method for determining sound pressure levels) and supports reporting formats aligned with local municipal noise ordinances. Calibration traceability is maintained to CNAS-accredited laboratories (certificate included with shipment).

Software & Data Management

Configuration, monitoring, and archival are managed through OSEN AcousticManager™ v4.2—a Windows/Linux-compatible desktop application and web-based dashboard. The software provides real-time SPL visualization across multiple units, geotagged noise event tagging, and automated report generation (PDF/Excel) compliant with ISO 14001 environmental management documentation requirements. Audit trails record all parameter changes, calibration events, and user logins—supporting GLP-aligned operational integrity. Data exports include time-stamped .WAV recordings synchronized with 1/3-octave spectral data, enabling post-processing in third-party tools such as MATLAB, Brüel & Kjær PULSE, or ARTA. Firmware updates are delivered over secure HTTPS with SHA-256 signature verification.

Applications

• Campus-wide emergency notification with spatially constrained alert zones (e.g., fire evacuation instructions directed only to affected buildings)
• Outdoor physical education instruction with localized voice reinforcement—eliminating cross-talk between concurrent PE classes on adjacent courts
• Noise impact assessment during construction or renovation near academic buildings, with continuous L_den and L_night logging per EU Directive 2002/49/EC
• Acoustic barrier validation: quantifying insertion loss of green walls or noise fences using paired OSEN-Z-26 units in source/receiver configuration
• Classroom ambient noise profiling per ANSI S12.60-2020 standards, supporting HVAC optimization and architectural retrofit planning

FAQ

Does the OSEN-Z-26 require external calibration equipment for routine use?

No. The unit includes a self-test sequence and internal reference calibrator (±0.3 dB accuracy); annual verification against a traceable pistonphone (e.g., Brüel & Kjær Type 4231) is recommended per ISO 7196.

Can multiple OSEN-Z-26 units be synchronized for phase-coherent beamforming?

Yes—via IEEE 1588v2 Precision Time Protocol (PTP) over managed Gigabit Ethernet, enabling sub-millisecond latency alignment for extended coverage or interference-nulling configurations.

Is the integrated sound level meter suitable for regulatory noise compliance reporting?

Yes—when operated in “Compliance Mode” with enabled windscreen and temperature/humidity compensation, it satisfies field measurement requirements under ISO 1996-2 and many national environmental protection agency protocols.

What audio latency can be expected in real-time voice transmission mode?

End-to-end latency is ≤12 ms (measured from analog input to directional beam output), verified per AES64-2019 methodology.

Does the system support integration with building management systems (BMS)?

Yes—via BACnet/IP (optional module) or Modbus TCP, enabling联动 with fire alarm panels, lighting controls, and occupancy sensors for adaptive acoustic zoning.