Narrow Band Signaling: A Clearer Option for Emergency Notification

Needing to be heard is not always about making a lot of noise, but making the right noise. In 2002, the National Fire Alarm Code (NFPA 72) recognized the need for clear audible messages by including a new audible signaling requirement for optional use on fire systems. Called "narrow band signaling" this technology was designed as a cost-effective method for making emergency messages heard in high-noise factories and other industrial areas. It works by reducing the number of audible appliances needed in noisy environments by issuing signals and voice messages at pre-determined frequencies that ride above the average ambient noise. In addition, since narrow band signaling systems can be designed to be fully compliant with OSHA and NFPA requirements, the technology makes it possible to provide audible notification communications to areas where it was not feasible under the previous NFPA code. How narrow band signaling works The narrow band method is based on the fact that noise at one frequency range does not mask sound signals at other frequency ranges.