In case of an emergency, the voice alarm system needs to guide people in the tunnel to safety. The audio transmission should be as clear as possible.
In general, due to high levels of reverberation and noise, a tunnel is not an ideal environment for voice alarm systems. This means the speech intelligibility becomes a critical parameter for any voice alarm application. To establish a sufficient level of speech intelligibility, a highly directional speaker system is required. By reducing the energy emitted to other surfaces, reflective sound energy can be minimized which results in a better direct to reverberant ratio. This will improve the maximum feasible speech intelligibility. To minimize disturbing echo effects, resulting in a loss of speech intelligibility, each horn speaker is driven by an individual signal channel in a 100 V installation, which is equipped with audio DSP including EQ and delay.
Our product S4T (Safety For Tunnel) offers the most effective solution which seamlessly combines a dedicated Voice Evacuation System
with tailored Tunnel Loudspeakers.