SOUNDS OF THE FUTURE

摘要

Fire alarm technology has come a long wayrnsince the introduction of the electric fire bell in 1860. For over 100 years it remained the most popular choice in sounding an alarm, except in areas with high background noise which used the electro-mechanical siren.rnWith the introduction of electronic sounders in the late 70s, the popularity of the fire bell began to decline. Electronic sounders were able to produce a range of sound outputs and consume much less power than their older, less flexible counterpart.