@article{ref1,
title="Detecting the Audible Alarm of Residential Smoke Detectors and Its Applications",
journal="IEEE transactions on consumer electronics",
year="1991",
author="Griebell, CA",
volume="37",
number="3",
pages="401-405",
abstract="Technology has recently been developed that provides an effective and practical wireless alarm interconnection between indoor residential smoke detectors and supplemental safety warning devices. Digital signal processing detects the unique signal &quot;signature&quot; of the indoor smoke detector's audible alarm and automatically activates supplemental warning devices. Outdoor sirens, automatic telephone dialers, flashing lights, escape path lighting, portable escape lights, and pillow vibrators used by people with impaired hearing are some examples of supplemental warning devices. This new signal processing technology is downward compatible with most of the tens of millions of smoke detectors already installed and operational in residences worldwide, and upward compatible with the annual 6-7 million battery powered smoke detectors now being marketed and sold throughout the U.S. and the world.<p />",
language="",
issn="0098-3063",
doi="",
url="http://dx.doi.org/"
}