Fire alarm system

• US 5,168,262 A
• Filed: 07/18/1990
• Issued: 12/01/1992
• Est. Priority Date: 12/02/1988
• Status: Expired due to Fees

• Current Assignee: Nohmi Bosai Kabushiki Kaisha
• Original Assignee: Nohmi Bosai Kabushiki Kaisha
• Inventors: Okayama, Yoshiaki
• Primary Examiner(s): Crosland, Donnie L.
• Application Number:
  US07/543,851
• Time in Patent Office: 867 Days
• Field of Search: 340/523, 340/506, 340/510, 340/511, 340/514, 340/870.16, 340/870.17, 340/870.09, 340/870.21, 340/505, 340/825.08, 340/588, 340/589
• US Class Current: 340/523
• CPC Class Codes: G08B 17/00 Fire alarms; Alarms responsive to explosion

Abstract

A fire alarm system employs a neural network for obtaining one or more types of fire related information values. A plurality of detection information values are time-serially collected from plural fire phenomenon detectors. The detection information values are signal processed such that a weighting coefficient is assigned thereto in accordance with a relative significance of the detection information value to the desired fire related information value. The various weighting coefficients are stored in advance in a memory. The weighting coefficients stored are established so that the fire related information value for a particular set of detection information values approximates a desired fire related information value.

Claims

1. A fire alarm system for receiving detection information values generated by at least one fire phenomenon detecting device and for subjecting the detection information values to signal processing for obtaining a value denoting at least one type of fire related information, said fire alarm system comprising:

detection information collecting means for time-serially collecting a plurality of detection information values generated by said at least one fire phenomenon detecting device; and

signal processing means for signal processing the plurality of the detection information values time-serially collected by said detecting information collecting means by respectively assigning weighting coefficients to each input detection information value in accordance with a relative significance thereof to said fire related information, altering each detection information value in accordance with a weighting coefficient assigned thereto, and arithmetically determining said fire related information value on the basis of the thus altered detection information values.

6. A fire alarm system as set forth in any one of claims 1 to 5, wherein said signal processing means includes storage means for storing in advance the weighting coefficients assigned to the detection information values, respectively, said weighting coefficients being selected to cause the fire related information value arithmetically determined by said signal processing means in response to the inputting of a particular set of the detection information values to approximate a desired fire related information value which is to be derived from said particular set of the information values.

7. A fire alarm system as set forth in any one of claims 1 to 5, further comprising a table having stored therein a particular set of detection information values together with at least one fire related information value which is to be obtained when said particularly set of detection information values is input, adjusting means for adjusting the weighting coefficients so that said fire related information value arithmetically determined by said signal processing means when said particularly set of detection information values stored in said table is input approximates said fire related information values stored in said table, wherein said signal processing means includes storage means for storing weighting coefficients for said respective detection information values, said weighting coefficients stored in said storage area being first adjusted by said adjusting means on the basis of the contents of said table.

9. A fire alarm system as set forth in any one of claims 1 to 5, comprising a receiving part and a plurality of fire detectors connected to said receiving part, each of said fire detectors including at least one fire phenomenon detecting means for detecting a physical quantity attributable to a fire phenomenon, wherein said signal processing means is incorporated in said receiving part.

10. A fire alarm system as set forth in any one of claims 1 to 5, comprising a receiving part and a plurality of fire detectors connected to said receiving part, each of said fire detectors including at least one fire phenomenon detecting means for detecting a physical quantity attributable to a fire phenomenon, wherein said signal processing means is incorporated in each of said fire detectors.

2. A fire alarm system for signal processing detection information values generated by a plurality of fire phenomenon detecting devices to obtain a value denoting at least one type of fire related information, said fire alarm system comprising:

detection information collecting means for collecting detection information values from each of said fire phenomenon detecting devices, wherein a plurality of detection information values from at least one of said fire phenomenon detection devices is time-serially collected; and

signal processing means for signal processing said detection information values collected by said detecting information collecting means by respectively assigning weighting coefficients to each input detection information value in accordance with a relative significance thereof to said fire related information, altering each detection information value in accordance with a weighting coefficient assigned thereto, and arithmetically determining said fire related information values on the basis of the thus altered detection information values.

3. A fire alarm system as set forth in claim 2, wherein said signal processing means includes first auxiliary processing means associated with said at least one fire phenomenon detecting device by which said plural detection information values are time-serially collected, for performing an arithmetic operation to obtain individual fire information values, and second auxiliary processing means for processing the individual fire information values input from said first auxiliary processing means and the detection information values input from the remaining fire phenomenon detecting devices in which detection information values are not time-serially collected, to thereby derive final fire related information values of higher reliability.

8. A fire alarm system as set forth in claim 3 or 5, further comprising a table for storing therein a particular set of detection information values together with at least one fire related information value which is to be obtained when said particular set of detection information values is input, adjusting means for adjusting the weighting coefficients so that said fire related information value arithmetically determined by said signal processing means when said particular set of detection information values stored in said table is input approximates said fire related information value stored in said table, wherein said signal processing means includes storage means for storing weighting coefficients for the respective detection information values, said weighting coefficients stored in said storage means for said first auxiliary processing means being previously established so that the fire related information value arithmetically determined by said first auxiliary processing means when the particularly set of detection information values for said first auxiliary processing means is input approximates a desired information value which is to be derived from each particular set for said first auxiliary processing means, while the weighting coefficients stored in said storage area for said second auxiliary processing means are initially adjusted by said adjusting means on the basis of the contents of said table.

11. A fire alarm system as set forth in claim 3 or 5, comprising a receiving part and a plurality of fire detectors connected to said fire receiving part, each of said fire detectors including at least one fire phenomenon detecting means for detecting a physical quantity attributable to a fire phenomenon, wherein said first auxiliary processing means is incorporated in each of said fire detectors and said second auxiliary processing means being incorporated in said receiving part.

4. A fire alarm system for obtaining a value denoting at least one type of fire related information by processing signals representative of detection information generated by a plurality of fire phenomenon detecting devices, comprising:

detection information collecting means for time-serially collecting a plurality of detection information values from each of said fire phenomenon detecting devices; and

signal processing means for signal processing the detection information values collected by said detection information collecting means, and including means for respectively assigning weighting coefficients to each of said detection information values upon inputting thereof in accordance with an extent to which each input detection information value contributes to said related fire information, altering each detection information value in accordance with a weighting coefficient assigned thereto, and arithmetically determining said fire related information value on the basis of the thus altered detection information values.

5. A fire alarm system as set forth in claim 4, wherein said signal processing means includes first auxiliary processing means associated with said fire phenomenon detecting devices in which said plural detection information values are time-serially collected, for performing an arithmetic operation to obtain individual fire information values, and second auxiliary processing means for processing the individual fire information value input from said first auxiliary processing means to derive final fire related information values of higher reliability.