EP0865646A1 - Method for analyzing the signals of a danger alarm system and danger alarm system for implementing said method - Google Patents
Method for analyzing the signals of a danger alarm system and danger alarm system for implementing said methodInfo
- Publication number
- EP0865646A1 EP0865646A1 EP97939930A EP97939930A EP0865646A1 EP 0865646 A1 EP0865646 A1 EP 0865646A1 EP 97939930 A EP97939930 A EP 97939930A EP 97939930 A EP97939930 A EP 97939930A EP 0865646 A1 EP0865646 A1 EP 0865646A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wavelet
- signal
- evaluation
- fuzzy
- pass filter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/02—Mechanical actuation of the alarm, e.g. by the breaking of a wire
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
- G08B29/18—Prevention or correction of operating errors
- G08B29/185—Signal analysis techniques for reducing or preventing false alarms or for enhancing the reliability of the system
- G08B29/186—Fuzzy logic; neural networks
Definitions
- the present invention relates to a method for analyzing the signal emes a hazard detector using frequency analysis and fuzzy logic evaluation, and to a hazard detector for carrying out this method.
- the hazard detector can be, for example, a flame detector, noise detector, fire detector, passive infrared detector or the like
- the output signals from hazard detectors are often characterized by frequency spectra typical of them. By analyzing these frequency spectra, the origin of the signals can be determined and, above all, real alarm signals can be distinguished from fault signals and false alarms can be avoided in this way in order to be able to distinguish the radiation from real flames from that of a source of disturbance, such as reflected sunlight or a flickering light source
- the output signals from hazard detectors are analyzed, for example, by means of Fou ⁇ er analysis, Fast-Fou ⁇ er analysis, Zero-Crossmg method or Turmng-Pomt method.
- Fou ⁇ er analysis for example, by means of Fou ⁇ er analysis, Fast-Fou ⁇ er analysis, Zero-Crossmg method or Turmng-Pomt method.
- the latter is described in GB-A 2 277 989 m using flame detectors, the time periods between Radiation maxi mia measured and checked for their regularities and irregularities and irregularly occurring radiation maxima are interpreted as a flame and regular ones as a disturbance
- the Fn7.7y-T .og1k is generally known.
- signal values so-called fuzzy sets, or fuzzy sets, are allocated in accordance with an association function, the value of the association function or the degree of association An unsharp amount, between zero and ems. It is important that the accessibility function can be normalized, ie the sum of all values of the membership function is equal to one, whereby the fuzzy logic evaluation allows a clear interpretation of the signal.
- the frequency of the detected radiation is analyzed and a distinction is made between regular and irregular signals in certain frequency ranges.
- the various signals in the given frequency ranges are evaluated according to several fuzzy logic rules. This procedure enables a more precise distinction between real flame signals and other interference signals and thus false alarm security.
- the frequency spectrum is generated here, for example, by fast Fourier transformation, which is complex in terms of the time required for the transformation, the necessary processor and the processor costs. It sometimes takes up to three seconds to determine a detected signal. For certain applications, however, a shorter evaluation time and response time before the alarm is desired, although methods such as the zero crossing or turning point method or wavelet analysis speed up the decision-making process, but are less accurate.
- the invention has for its object to provide a method for frequency analysis of a signal from a hazard detector, which is combined with a fuzzy logic evaluation, and is carried out in comparison with analysis methods of the prior art with a smaller number of computing steps, so that in a result of the same or higher accuracy is achieved in a shorter time. Furthermore, the method should be able to be carried out with a simpler processor and therefore more cost-effectively.
- the object is achieved in that a rapid wavelet transformation is carried out as frequency analysis and the original signal is passed through a multi-stage filter cascade of high / low-pass filter pairs, and in that for each filter stage of the wavelet transformation a membership function is generated from the results of the high-pass filter is used for further analysis of the frequency signal according to fuzzy logic rules.
- the wavelet transformation is a transformation or mapping of a signal from the time domain to the frequency domain (see, for example, "The Fast Wavelet-Transfo ⁇ n" by Mac A Cody in Dr Dobb's Journal, Ap ⁇ l 1992), so it is basically the Fou ⁇ er transformation and fast -Fou ⁇ er-Transformation similar It differs from these but by the basic function of the transformation, according to which the signal is developed.
- Wavelet transformation is used in a so-called wavelet or wave packet.
- wavelet or wave packet There are various types, such as a Gaussian, Sphne or Haar wavelet, which can be shifted in the time domain and stretched or compressed in the frequency domain using two parameters
- localized signals can be transformed in the time as well as in the frequency domain by means of a wavelet transformation.
- a fast wavelet transformation is carried out by the pyramid algorithm according to Mallat, which is based on repeated use of a low-pass and high-pass filter, by means of which the median frequencies of The high-frequency signal components are separated.
- the output signal of the low-pass filter is in turn fed to a pair of high-pass / high-pass filters. This results in a number of approximations of the original signal, each of which has a higher resolution than the previous one. The number of operations required for the transformation.
- the results of the fuzzy evaluation permit a decision as to whether an alarm or a fault signal is present.
- the number of for the wavelet analysis of the required computing steps is significantly reduced compared to Fou ⁇ er analyzes. This shortens the computing time required to identify the signal and reduces the processor costs
- the original digitized signal is first analyzed by a fast wavelet transformation.
- the signal according to Mallat's algorithm is passed through several stages of a cascade of high-pass and low-pass filter pairs.
- the results of the high-pass filters then result in an access function for each filter stage which contains the sum of the calculated values from the high-pass filter and is divided by the sum of the squares of the original signal values.
- the sum of the access functions that are generated here for each filter level is equal to or almost equal to one.
- a frequency analysis of this type yields the following advantages.
- the high-pass filters of the wavelet transformation first provide information about the high-frequency signals. This is particularly advantageous in flame reporting, since the information about the higher frequencies accelerates the identification of the type of signal and its accuracy can be increased For example, if a high-frequency signal of over 15 Hz is detected, this is interpreted as a disturbance signal.
- the subsequent message, disturbance signal or alarm signal occurs earlier and is, with greater certainty, often very simple in form, such as a Haar-Wavelet, and enable an analysis with wemgen arithmetic, which additionally shortens the computing time and the decision time. However, the shortening of the decision time is not associated with a loss of accuracy in the signal identification. If more lines of code are required, an inexpensive processor can also be used be set
- a first preferred embodiment of the method according to the invention is characterized in that the wavelet used for the fast wavelet transformation is an orthonormal or semi-orthonormal wavelet or also a wavelet packet basis, and that the membership functions generated in each case are those generated by the wavelet Contain coefficient weighted sum of the squared values of the high-pass filter and the sum of the squared value of the original signal and used in normalized form for the further analysis of the frequency signal according to fuzzy logic rules
- the wavelet used for the fast wavelet transformation is an orthonormal or semi-orthonormal wavelet or a wavelet packet basis
- the generated functions each contain the sum of the squared output values of the high-pass filter and the sum of the squared values of original signal of the hazard detector and are used in a normalized form for the evaluation of the frequency signal according to fuzzy logic rules
- the hazard detector according to the invention for carrying out the method mentioned contains a sensor for a hazard parameter, an evaluation electronics with means for processing the output signal of the sensor and a microprocessor with an fuzzy controller.
- This hazard detector is characterized in that the microprocessor has a software program according to which the fuzzy controller is part of a fuzzy wavelet controller, and that the signal processed by the evaluation electronics and supplied to the fuzzy controller is wavelet-transformed
- FIG. 1 shows a block diagram of a method with a rapid wavelet analysis by means of several filter stages and further analysis by fuzzy logic
- FIG. 2 shows representations of associated functions using the example of a frequency analysis using a fast Haar-Wavelet transformation
- FIG. 3 shows a block diagram of a hazard detector for performing the method of
- the output signal XQ k is first used to perform a fast wavelet transformation 1 using any wavelet of the type known from the prior art.
- An orthonormal or semi-orthonormal wavelet or a wavelet packet base is preferably used.
- the signal values are denoted by XJ ⁇ and VJ ⁇ , where x is the original signal values and the values from the low-pass filters (LP) and y are the values from the high-pass filters (HP).
- the index i denotes the level of the filter cascade in increasing numbers, the original signal being at level zero.
- the index k denotes an individual value of a signal. It is from an original signal XQ au k f of the zero level assumed, which is transformed by a plurality of filtering.
- the output signal of the first high-pass filter gives the values yi k and the output signal of the first low-pass filter, which also forms the input signal for the second filter stage, the values x ⁇ ⁇
- the output signal of the second high-pass filter gives the values y2 k > that of the second low-pass filter X2 k wu "d added to a third pair of filters, etc. It should be noted here that the number of values resulting from the filter stages is different for each stage. More specifically, for each stage the number of values decreases by a factor of two.
- the coefficients p and q for the wavelet reconstruction can be found in the book already mentioned.
- the access functions ⁇ , are then generated from the output values of the high-pass filter of the respective filter stage and the associated coefficients q for the wavelet reconstruction
- the digitized raw values x f jk are subjected to a quick hair analysis.
- the values y ⁇ of each filter stage I are used to form access functions ⁇ t , namely
- these access functions are fed to a fuzzy logic controller 2 (FIG. 1) for evaluation according to fuzzy logic rules, whereupon a decision is made as to whether an alarm signal is triggered or the signal is evaluated as a fault
- this method is suitable for distinguishing between interference signals, such as pe ⁇ odic signals of over 15 Hz, and real flame signals, such as narrow-band signals of medium frequency or broadband signals of medium frequency range.Through the rapid identification of high-frequency signals, the Disturbance signals of this frequency and their resonance frequencies are eliminated from the signal, which speeds up the frequency analysis of the signal. By accelerating the frequency analysis by means of the wavelet transformation, the time required for a decision on the type of signal and the message to be issued can be from three seconds to one, for example Second reduced
- the method described is also suitable for noise detectors, passive infrared detectors, for the spectral analysis of the signals of individual pixels in the image processing as well as for various sensors such as gas and vibration sensors
- FIG. 3 shows a diagram of a hazard detector 3 for carrying out the method described.
- the hazard detector 3 has a sensor 4 for the detection of hazard indicators, an evaluation electronics 5, a microprocessor 6 and the fuzzy controller 2.
- the hazard indicators can, for example, determine the intensity of emer Flame emitted radiation, the acoustic signal emes noise, the Ixi infrared radiation emitted by a warm body or the output signal from a CCD camera sem
- the output signal of the sensor 4 is fed to the evaluation electronics 5, which has suitable means for processing the signal, such as an amplifier, and passes from the evaluation electronics 5 into the microprocessor 6.
- the fuzzy controller 2 (FIG. 1) is shown here as Software integrated in the microprocessor 6.
- the fuzzy controller is part of a fuzzy wavelet controller that links the fuzzy logic theory with the wavelet theory.
- the microprocessor 6 contains, for example, a software program of the type shown in FIG. 4, which subjects the input signal to a wavelet transformation. The resulting, transformed signal is then fed to the fuzzy controller 2. If the signal resulting from the fuzzy controller 2 is evaluated as an alarm, it is fed to an alarm delivery device 7 or an alarm center.
- FIG. 4 shows a block diagram for the implementation of the method according to the invention in the microprocessor of a hazard detector, this microprocessor having a fuzzy wavelet controller 8.
- the evaluation electronics 5 FIG. 3
- the output signal of the sensor 4 is fed to the fuzzy wavelet controller 8, in which the signal is first passed through a cascade of filters 9.
- the membership functions ⁇ j are formed from the results 10 of each filter 9 according to equation 1. These functions are then fed to the fuzzy controller 2 for fuzzy analysis, which optionally sends a signal to the alarm output device 7.
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Software Systems (AREA)
- Artificial Intelligence (AREA)
- Automation & Control Theory (AREA)
- Evolutionary Computation (AREA)
- Computer Security & Cryptography (AREA)
- Mathematical Physics (AREA)
- Emergency Management (AREA)
- Business, Economics & Management (AREA)
- Alarm Systems (AREA)
- Fire-Detection Mechanisms (AREA)
- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
- Geophysics And Detection Of Objects (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
- Feedback Control In General (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP97939930A EP0865646B1 (en) | 1996-10-04 | 1997-09-19 | Method for analyzing the signals of a danger alarm system and danger alarm system for implementing said method |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP96115952 | 1996-10-04 | ||
EP96115952A EP0834845A1 (en) | 1996-10-04 | 1996-10-04 | Method for frequency analysis of a signal |
EP97939930A EP0865646B1 (en) | 1996-10-04 | 1997-09-19 | Method for analyzing the signals of a danger alarm system and danger alarm system for implementing said method |
PCT/CH1997/000354 WO1998015931A1 (en) | 1996-10-04 | 1997-09-19 | Method for analyzing the signals of a danger alarm system and danger alarm system for implementing said method |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0865646A1 true EP0865646A1 (en) | 1998-09-23 |
EP0865646B1 EP0865646B1 (en) | 2002-03-13 |
Family
ID=8223268
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96115952A Withdrawn EP0834845A1 (en) | 1996-10-04 | 1996-10-04 | Method for frequency analysis of a signal |
EP97939930A Expired - Lifetime EP0865646B1 (en) | 1996-10-04 | 1997-09-19 | Method for analyzing the signals of a danger alarm system and danger alarm system for implementing said method |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96115952A Withdrawn EP0834845A1 (en) | 1996-10-04 | 1996-10-04 | Method for frequency analysis of a signal |
Country Status (9)
Country | Link |
---|---|
US (1) | US6011464A (en) |
EP (2) | EP0834845A1 (en) |
JP (1) | JP2000503438A (en) |
KR (1) | KR19990071873A (en) |
CN (1) | CN1129879C (en) |
AT (1) | ATE214504T1 (en) |
DE (1) | DE59706608D1 (en) |
PL (1) | PL327070A1 (en) |
WO (1) | WO1998015931A1 (en) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6742183B1 (en) | 1998-05-15 | 2004-05-25 | United Video Properties, Inc. | Systems and methods for advertising television networks, channels, and programs |
US6219373B1 (en) * | 1998-06-15 | 2001-04-17 | The United States Of America As Represented By The Secretary Of The Navy | Wavelet-based interference filtering for spread-spectrum signal |
US6879253B1 (en) * | 2000-03-15 | 2005-04-12 | Siemens Building Technologies Ag | Method for the processing of a signal from an alarm and alarms with means for carrying out said method |
US6184792B1 (en) * | 2000-04-19 | 2001-02-06 | George Privalov | Early fire detection method and apparatus |
BR0209543A (en) * | 2001-05-11 | 2005-04-26 | Detector Electronics | Flame detection and fire detection method and apparatus |
FR2841424A1 (en) * | 2002-06-25 | 2003-12-26 | Koninkl Philips Electronics Nv | METHOD FOR DETECTING BLOCK ARTEFACTS |
US7202794B2 (en) * | 2004-07-20 | 2007-04-10 | General Monitors, Inc. | Flame detection system |
MX2008001357A (en) * | 2005-07-29 | 2008-04-16 | V&M Deutschland Gmbh | Method for error-free checking of tubes for surface faults. |
WO2008088325A1 (en) * | 2007-01-16 | 2008-07-24 | Utc Fire & Security Corporation | System and method for video based fire detection |
US8094015B2 (en) * | 2009-01-22 | 2012-01-10 | International Business Machines Corporation | Wavelet based hard disk analysis |
US8941734B2 (en) * | 2009-07-23 | 2015-01-27 | International Electronic Machines Corp. | Area monitoring for detection of leaks and/or flames |
US8359616B2 (en) | 2009-09-30 | 2013-01-22 | United Video Properties, Inc. | Systems and methods for automatically generating advertisements using a media guidance application |
US8949901B2 (en) | 2011-06-29 | 2015-02-03 | Rovi Guides, Inc. | Methods and systems for customizing viewing environment preferences in a viewing environment control application |
CN103501205B (en) * | 2013-10-11 | 2016-05-11 | 北京理工大学 | Target Frequency Hopping Signal recognition methods based on fuzzy comprehensive evoluation |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4866420A (en) * | 1988-04-26 | 1989-09-12 | Systron Donner Corp. | Method of detecting a fire of open uncontrolled flames |
US5453733A (en) * | 1992-07-20 | 1995-09-26 | Digital Security Controls Ltd. | Intrusion alarm with independent trouble evaluation |
US6310963B1 (en) * | 1994-09-30 | 2001-10-30 | Sensormatic Electronics Corp | Method and apparatus for detecting an EAS (electronic article surveillance) marker using wavelet transform signal processing |
ATE203118T1 (en) * | 1994-12-19 | 2001-07-15 | Siemens Building Tech Ag | METHOD AND ARRANGEMENT FOR DETECTING A FLAME |
US5815198A (en) * | 1996-05-31 | 1998-09-29 | Vachtsevanos; George J. | Method and apparatus for analyzing an image to detect and identify defects |
-
1996
- 1996-10-04 EP EP96115952A patent/EP0834845A1/en not_active Withdrawn
-
1997
- 1997-09-19 PL PL97327070A patent/PL327070A1/en unknown
- 1997-09-19 JP JP10517041A patent/JP2000503438A/en not_active Ceased
- 1997-09-19 WO PCT/CH1997/000354 patent/WO1998015931A1/en not_active Application Discontinuation
- 1997-09-19 EP EP97939930A patent/EP0865646B1/en not_active Expired - Lifetime
- 1997-09-19 KR KR1019980704157A patent/KR19990071873A/en not_active Application Discontinuation
- 1997-09-19 US US09/077,106 patent/US6011464A/en not_active Expired - Lifetime
- 1997-09-19 AT AT97939930T patent/ATE214504T1/en active
- 1997-09-19 DE DE59706608T patent/DE59706608D1/en not_active Expired - Lifetime
- 1997-09-19 CN CN97191373A patent/CN1129879C/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO9815931A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN1205094A (en) | 1999-01-13 |
EP0834845A1 (en) | 1998-04-08 |
KR19990071873A (en) | 1999-09-27 |
WO1998015931A1 (en) | 1998-04-16 |
JP2000503438A (en) | 2000-03-21 |
ATE214504T1 (en) | 2002-03-15 |
US6011464A (en) | 2000-01-04 |
CN1129879C (en) | 2003-12-03 |
EP0865646B1 (en) | 2002-03-13 |
DE59706608D1 (en) | 2002-04-18 |
PL327070A1 (en) | 1998-11-23 |
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