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HOME >> NEWS >> Design Optimization of Perforated Grilles for Touchless Elevator Voice Systems

Design Optimization of Perforated Grilles for Touchless Elevator Voice Systems

Touchless elevator systems are increasingly deployed to reduce surface contact in public buildings. The clarity and accuracy of voice commands rely heavily on the speaker grille’s acoustic properties. This article examines key design elements such as open area ratio, perforation geometry, material durability, and ISO-compliant testing methods. Using examples like Tokyo’s metro modernization, it highlights the role of matte-finished perforated grilles in achieving high voice recognition accuracy. Acoustic modeling, reflection control, and hygiene-compatible materials are also addressed to ensure optimal speech transmission in voice-activated elevator environments.

Design Optimization of Perforated Grilles for Touchless Elevator Voice Systems

Voice Interaction in Modern Vertical Transport

As buildings adopt voice-activated elevator systems to minimize physical contact, the acoustic clarity of system prompts becomes essential. These systems rely on concealed speakers to deliver instructions and confirmation sounds. Perforated grilles not only protect the speakers but also influence the dispersion, intelligibility, and perceived direction of sound, as explored in ScienceDirect studies on sound transmission in confined spaces.

Critical Parameters for Grille Design

Engineering a grille that supports speech clarity involves:

  • Open area of 60–70% for optimal frequency balance

  • Perforation size of 1.6 mm to 2.2 mm, circular or micro-slot

  • Materials tested for corrosion and disinfectant exposure

Acoustic testing per ISO 3382-2 and voice quality analysis from ASTM E2635 help assess performance.


Use Case: Tokyo Transit Elevator Modernization

A major metro network in Tokyo introduced touchless elevators in response to COVID-19. Speaker grilles integrated into call panels were fabricated from 1 mm anodized aluminum with matte anti-glare finish. Paired with beamforming microphones, the system achieved 93% voice command accuracy even in noisy platforms. Findings are cited in IEEE Human-Building Interfaces Research.

Acoustic Modeling and Material Validation

Simulations and lab tests measured:

  • SPL deviation pre/post grille (< 1.5 dB across 500–5000 Hz)

  • Reflection profiles from stainless vs aluminum finishes

  • Durability to 1200 cleaning cycles with quaternary ammonium-based cleaners

Designs used grille curvature to angle reflections toward user height zones (1.2–1.8 m).


Integration and System Matching

When paired with optical proximity sensors or voice UI processors, perforated grilles must:

  • Maintain open acoustic paths with minimal turbulence

  • Prevent dust or liquid ingress (IP44 rated)

  • Conform to ISO 9296 for emitted noise validation

Dual-layer mesh backing is often applied to reduce unwanted resonance.


Related smart system panels: Audio Control Grilles, Speaker System Flush Panels, Micro Acoustic Panel Designs

References: ScienceDirect Elevator Acoustics, ASTM E2635, IEEE Intelligent Interface Study, ISO 9296, ISO 3382-2

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