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Detection of selected audio events in a real environment
Kowolowski, Alexander ; Burget, Radim (referee) ; Přinosil, Jiří (advisor)
This work deals with methods for the detection of dangerous events, in this case gunshots, in a real environment. First of all, a testing and training database of sounds from the MIVIA database was created. In this database, the files were contained in six versions of signal-to-noise ratio, so the subsequent testing of the selected methods took place for the various shuffled files, and it was found that some methods are more accurate for cleaner recordings than others, but less accurate for more noisy ones. For the typical feature extraction from the input sound, the mel-frequency cepstral coefficients method was always used. In the thesis, the methods of support vector machines and ensemble of a number of weak classifiers are gradually tested on the created databases. These methods are then further optimized, for example by using statistical variables, and after optimization they achieve better results, as expected. In the work, two scripts were created, where one created a training database and on this data trained the classifier and the other created the test database, tested the selected classifier and obtained the results. The results are processed by confusion matrix and several proportional variables such as accuracy, sensitivity, specificity and others are calculated. These results are always listed in the relevant chapter of the thesis in the tables and column charts and are properly commented on.
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Detection of selected audio events in a real environment
Kowolowski, Alexander ; Burget, Radim (referee) ; Přinosil, Jiří (advisor)
This work deals with methods for the detection of dangerous events, in this case gunshots, in a real environment. First of all, a testing and training database of sounds from the MIVIA database was created. In this database, the files were contained in six versions of signal-to-noise ratio, so the subsequent testing of the selected methods took place for the various shuffled files, and it was found that some methods are more accurate for cleaner recordings than others, but less accurate for more noisy ones. For the typical feature extraction from the input sound, the mel-frequency cepstral coefficients method was always used. In the thesis, the methods of support vector machines and ensemble of a number of weak classifiers are gradually tested on the created databases. These methods are then further optimized, for example by using statistical variables, and after optimization they achieve better results, as expected. In the work, two scripts were created, where one created a training database and on this data trained the classifier and the other created the test database, tested the selected classifier and obtained the results. The results are processed by confusion matrix and several proportional variables such as accuracy, sensitivity, specificity and others are calculated. These results are always listed in the relevant chapter of the thesis in the tables and column charts and are properly commented on.
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