Fire alarm system having prestored fire likelihood ratio functions for respective fire related phenomena
First Claim
1. A fire alarm system comprising:
- detecting means for detecting at least one fire related condition of a detected area;
data generating means, coupled to said detecting means, for generating data denoting plural fire related phenomena based on the at least one fire related condition;
function memory means for storing data denoting plural likelihood ratio functions respectively associated with the plural fire related phenomena, each of the plural likelihood ratio functions defining a relation between a value of a fire likelihood ratio and a value of a respective fire related phenomenon, the fire likelihood ratio defining a relative probability of a fire attributable to the value of the respective fire related phenomenon;
processing rule memory means for storing plural processing rules, each of the processing rules designating at least one of the plural likelihood ratio functions and defining a processing to be performed by using the at least one designated likelihood ratio function to obtain one value of the fire likelihood ratio;
processing means, coupled to said data generating means and said function memory means and said processing rule memory means, for using the plural processing rules stored in said processing rule memory means to obtain corresponding plural likelihood ratio values, for determining a centroid value of the thus obtained plural likelihood ratio values, and for discriminating the presence of a fire based on the thus determined centroid value.
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Accused Products
Abstract
A fire alarm system discriminates the presence of a fire using plural likelihood ratio functions respectively associated with plural fire related phenomenon. At least one fire related condition, for example, a temperature level, a smoke density or a gas concentration, of a detected area is detected. Data denoting plural fire related phenomenon are generated based on the at least one fire related condition. The data of each fire related phenomenon is applied to a respective likelihood ratio function defining a relation between the value of the fire related phenomenon and the value of a fire likelihood ratio. The fire likelihood ratio defines a relative probability of a fire attributable to the value of the respective fire related phenomenon. Plural fire likelihood ratio values are obtained according to processing rules, and a centroid value is obtained based on the plural fire likelihood ratio values. A fire is discriminated based on the centroid value.
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Citations
18 Claims
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1. A fire alarm system comprising:
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detecting means for detecting at least one fire related condition of a detected area; data generating means, coupled to said detecting means, for generating data denoting plural fire related phenomena based on the at least one fire related condition; function memory means for storing data denoting plural likelihood ratio functions respectively associated with the plural fire related phenomena, each of the plural likelihood ratio functions defining a relation between a value of a fire likelihood ratio and a value of a respective fire related phenomenon, the fire likelihood ratio defining a relative probability of a fire attributable to the value of the respective fire related phenomenon; processing rule memory means for storing plural processing rules, each of the processing rules designating at least one of the plural likelihood ratio functions and defining a processing to be performed by using the at least one designated likelihood ratio function to obtain one value of the fire likelihood ratio; processing means, coupled to said data generating means and said function memory means and said processing rule memory means, for using the plural processing rules stored in said processing rule memory means to obtain corresponding plural likelihood ratio values, for determining a centroid value of the thus obtained plural likelihood ratio values, and for discriminating the presence of a fire based on the thus determined centroid value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A fire alarm system comprising:
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detecting means for detecting at least one fire related condition of a detected area; data generating means, coupled to said detecting means, for generating data denoting plural fire related phenomena based on the at least one fire related condition; function memory means for storing data denoting plural likelihood ratio functions respectively associated with the plural fire related phenomena, each of the plural likelihood ratio functions defining a relation between a value of a fire likelihood ratio and a value of a respective fire related phenomenon, the fire likelihood ratio defining a relative probability of a fire attributable to the value of the respective fire related phenomenon; processing rule memory means for storing plural processing rules, each of the processing rules designating at least one of the plural likelihood ratio functions and defining a processing to be performed by using the at least one designated likelihood ratio function to obtain one value of the fire likelihood ratio; selection control means for selecting at least one of the plural processing rules stored in said processing rule memory means in accordance with at least one non-fire related environmental condition in the detected area; processing means, coupled to said data generating means and said function memory means and said processing rule memory means and selection control means, for using the at least one selected processing rule selected by said selection control means to obtain at least one corresponding likelihood ratio value, for determining a centroid value of the thus obtained at least one likelihood ratio value, and for discriminating the presence of a fire based on the thus determined centroid value. - View Dependent Claims (10, 11, 12, 13)
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14. A fire alarm system comprising:
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detecting means for detecting at least one fire related condition of a detected area; data generating means, coupled to said detecting means, for generating data denoting plural fire related phenomena based on the at least one fire related condition; function memory means for storing data denoting plural likelihood ratio functions respectively associated with the plural fire related phenomena, each of the plural likelihood ratio functions defining a relation between a value of a fire likelihood ratio and a value of a respective fire related phenomenon, the fire likelihood ratio defining a relative probability of a fire attributable to the value of the respective fire related phenomenon; processing rule memory means for storing plural processing rules, each of the processing rules designating at least one of the plural likelihood ratio functions and defining a processing to be performed by using the at least one designated likelihood ratio function to obtain one value of the fire likelihood ratio; weighting control means for imparting a weighting coefficient to each of the plural processing rules stored in said processing rule memory means in accordance with at least one non-fire related environmental condition in the detected area; processing means, coupled to said data generating means and said function memory means and said processing rule memory means and weighting control means, for using the plural processing rules having weighting coefficients imparted thereto by said weighting control means to obtain corresponding plural likelihood ratio values, for determining a centroid value of the thus obtained plural likelihood ratio values, and for discriminating the presence of a fire based on the thus determined centroid value. - View Dependent Claims (15, 16, 17, 18)
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Specification