Title:
METHOD AND SYSTEM FOR ACOUSTIC DETECTION OF AEROSOL DISSEMINATION
Document Type and Number:
WIPO Patent Application WO2002001528
Kind Code:
A3
Abstract:
Disclosed is a method for detecting unwanted dissemination of aerosolized agents into an HVAC system in a building by detecting the sound of the dissemination at the time it occurs. To be able to distinguish the sound of the dissemination event from the ambient background noise of the HVAC system, sound extraction techniques, e.g., high pass filtering and an adaptive variance estimator, are utilized which can detect the event's noise from within the ambient background noise of the system. A microphone continually monitors background sound levels and senses the additional sound resulting from the activation of the aerosol delivery system, which has a unique sound "signature". Once an event is detected, defensive actions, e.g., activating additional sensors, closing all air vents, and shutting off the HVAC system, can be taken.
Inventors:
NAJMI AMIR-HOMAYOON (US)
SMITH DEXTER G (US)
MCLOUGHLIN MICHAEL P (US)
KO HARVEY W (US)
SMITH DEXTER G (US)
MCLOUGHLIN MICHAEL P (US)
KO HARVEY W (US)
Application Number:
PCT/US2001/019925
Publication Date:
May 16, 2002
Filing Date:
June 22, 2001
Export Citation:
Assignee:
UNIV JOHNS HOPKINS (US)
NAJMI AMIR HOMAYOON (US)
SMITH DEXTER G (US)
MCLOUGHLIN MICHAEL P (US)
KO HARVEY W (US)
NAJMI AMIR HOMAYOON (US)
SMITH DEXTER G (US)
MCLOUGHLIN MICHAEL P (US)
KO HARVEY W (US)
International Classes:
G08B13/16; (IPC1-7): G08B13/16
Foreign References:
| US5027643A | 1991-07-02 | |||
| US3569923A | 1971-03-09 |
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