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HOME >> NEWS >> Advanced Perforated Speaker Grilles for Touchless Elevator Sound Guidance Systems

Advanced Perforated Speaker Grilles for Touchless Elevator Sound Guidance Systems

Touchless elevator systems now play a vital role in hygienic building design. To ensure voice prompts are clear, audible, and intelligible, perforated speaker grilles must be precisely engineered for optimal acoustic performance. This article explores grille specifications including micro-perforation size, open area ratio, and ISO-compliant acoustic testing. It also outlines material requirements such as anti-corrosion finishes, vandal resistance, and antibacterial coatings. A case study from Singapore demonstrates measurable improvements in voice recognition accuracy after grille optimization.

Advanced Perforated Speaker Grilles for Touchless Elevator Sound Guidance Systems

Why Touchless Elevators Rely on Optimized Acoustics

In post-pandemic architecture, touchless elevators have emerged as a critical solution for public hygiene. These systems often rely on audio prompts for floor selection, occupancy alerts, and system status. The clarity and accuracy of these sound cues are highly dependent on the design of the perforated speaker grille covering the embedded sound modules. As outlined by ISO 8201, intelligibility in life-safety audio systems must meet stringent signal-to-noise benchmarks.

Acoustic Performance Requirements

The design of grilles in elevator systems must ensure:

  • Clear sound dispersion across vertical and horizontal planes

  • Minimal SPL loss through grille perforations (target: ≤ 1.2 dB)

  • Compliance with ASTM E1130 for building communication system acoustics

To optimize vocal command feedback, grille openings must align with voice frequency emphasis (500–3000 Hz), with hole diameters between 1.5–2 mm and 60–70% open area.


Material Specifications and Finishing

Elevator interiors demand tamper-proof, corrosion-resistant components. Grilles are typically fabricated using:

  • 304 or 316L stainless steel for long-term integrity

  • Anodized aluminum panels with fingerprint-resistant coating

  • Anti-bacterial nano-coatings compliant with ISO 22196

These finishes must also withstand high-frequency cleaning cycles with alcohol and chlorine-based agents.


Case Study: Smart Elevator Deployment in Singapore

A commercial tower in Singapore installed AI-guided elevators with voice navigation and ultrasonic sensors. Each speaker was enclosed in a micro-perforated grille (1.6 mm holes, 68% open area) integrated flush into the panel. Speech recognition accuracy improved by 14% post-installation. Research published via IEEE Elevator Systems Symposium supported grille-induced sound clarity improvement.

Installation and Safety Protocols

Grilles are installed behind vandal-resistant panels or integrated within call button casings. Backed by sound-absorbing foam, they reduce echo in confined shafts. Routine maintenance includes:

  • Monthly disinfection (per ASTM D4828)

  • Audio calibration every 6 months (ISO 3382 standards)

  • Grille replacement every 24 months in high-traffic lifts


Related elevator applications: Voice-Control Interfaces, Audio Panel Integrity, Flush-Mounted Control Panels

References: ISO 8201, ASTM E1130, ISO 22196, IEEE Elevator Systems Symposium, ScienceDirect Smart Lift Acoustics

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