IMPROVEMENT OF GLASS BREAK ACOUSTIC SIGNAL DETECTION VIA APPLICATION OF WAVELET PACKET DECOMPOSITION<br />
Journal Title: Metrology and Measurement Systems - Year 2008, Vol 15, Issue 4
Abstract
The main subject of the authors' research are non-contact methods of glass break detection based on analysis of the acoustic signal generated during the event. This problem has essential meaning for modern cost-effective alarm systems, particularly those installed into big buildings. The main diffculties of the matter are: transient, stochastic character of the signal, great number of similar sounds (false signals, mainly accidental glass hits without break) and variability of many parameters (e.g. size and thickness of the glass pane, distance to detector). During research the authors developed a detection algorithm based on Wavelet Transformation (WT) and found some measures allowing to extract distinctive features from the signal and their classification. The obtained detection effciency (>90%) is satisfactory, but immunity against false signals (near to 80%) does not reach the assumed level. Because Wavelet Packet Decomposition (WPD) provides a more detailed analysis in the frequency domain than WT and does better extraction of time-frequency interdependencies of the signals, the authors decide to use it for algorithm improvement. This paper discusses results of WPD application to improve system performance and to increase the immunity against false signals. In the paper, on the background of a description of the problem, a theoretical basis of the WPD method and results of the investigation of its effectiveness are presented.
Authors and Affiliations
IRENEUSZ BEMKE, ROMUALD ZIELONKO
Keywords
Related Articles
- EP ID EP123827
- DOI -
- Views 87
- Downloads 0
INTRODUCTION TO THE T AND CHI-SQUARE DISTRIBUTION FOR A MORE ACCURATE EVALUATION OF THE MEASURE OF THE WORD ERROR RATE IN ANALOGTO-DIGITAL CONVERTERS<br />
The word error rate (WER) in an Analog to Digital Converter (ADC) is the probability of receiving an erroneous code for an input, after correction is made for gain, offset, and nonlinearity errors, and a specified allowa...
MEASUREMENT METHOD OF SHAPE DEVIATION OF CYLINDRICAL MICRO-LENSES USING FOCUSED LASER BEAM AND REFERENCE AXIS<br />
Constant progress in application of micro-lenses in many modern optical systems caused a continuous increase of the need to investigate methods of their measurement. A new method of measurement of shape deviation of such...
CONGRESS OF METROLOGY 2007
From 9 to13 September 2007, at the AGH University of Science and Technology, there took place the undoubtedly most important metrological conference, i.e. The Congress of Metrology ‘2007. Metrological congresses are held...
APPLICATION OF SOM IN CLASSIFICATION OF EGG SIGNALS
The report presents problems associated with computer aided gastric diagnosis. The subject of the study are electrogastrographic (EGG) signals (non-invasively measured electrical signals generated by the human stomach)....
THE ANTIALIASING FILTER PARAMETERS PROPOSITION FOR LABORATORY AND DOMESTIC EQUIPMENT APPLICATION OF POWER QUALITY MEASUREMENTS SYSTEMS
Digital signal processing exists in systems which perform the processing of power waveforms. All measuring devices that use digital signal processing and computing of its discrete spectrum should be equipped with an anti...