Method of detecting a fire of open uncontrolled flames
Method and detector for detecting a flame
Intrusion alarm with independent trouble evaluation
Method and apparatus for analyzing an image to detect and identify defects Patent #: 5815198
ApplicationNo. 077106 filed on 09/30/1998
US Classes:340/506, Alarm system supervision340/511, Threshold or window (e.g., of analog electrical level)340/577, Flame340/578, By radiant energy340/657, Electrical characteristic706/8Fuzzy inference processing
ExaminersPrimary: Crosland, Donnie L.
Attorney, Agent or Firm
Foreign Patent References
International ClassG08B 029/00
Foreign Application Priority Data1996-10-04 EP
AbstractIn a method for frequency analysis of a signal of a hazard detector, wavelet transformation is combined with fuzzy logic analysis. In the transformation, based on orthonormal or semi-orthonormal wavelets, an original signal is fed to a multi-stage filter cascade of pairs of high-pass/low-pass filters. From the output of the high-pass filter, wavelet coefficients and values of the original signal, each filter stage produces an association function. The functions are normalized and analyzed further in accordance with fuzzy logic rules. The method is particularly suitable for analyzing signals from flame detectors, noise detectors and the like. As processor code for transformation and analysis is kept short, high speed and accuracy are achieved at low cost.