Notre-Dame de Paris Cathedral
![](https://merlaud.fr/sites/default/files/styles/large/public/field/image/montagenews.jpg?itok=eoAx84Ht)
After an extended acoustical study (on site reverberation time measurement, 3D modelling, speaker layout, computer simulation) MERLAUD equipped one of the most touristic places in the world :
- Voice Evacuation and General Alarm complying with EN54 standards
- Delayed lines and digital signal processing