Title: Method for analyzing signal of danger alarm system and denger alarm system for implementing said method
Application Number: 97191373 Application Date: 1997.09.19
Publication Number: 1205094 Publication Date: 1999.01.13
Approval Pub. Date: 2003.12.03 Granted Pub. Date: 2003.12.03
International Classifi-cation: G06F17/00;G08B17/02
Applicant(s) Name: Cerberus AG. Address:
Inventor(s) Name: M. P. Thuillard
Attorney & Agent: ma tieliang
Abstract:
    In 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.
Time: 5