It is important to have some information aboutsound absorption coefficient of already installed and appliedmaterials. A new in-situ method is proposed. Presentedmethod utilizes a dipole characteristic of the source. If thedipole is placed in vicinity of acoustical obstacle, sound field isdeformed and it depends only on the acoustical properties ofthe obstacle.When using a real dipole source, asymmetry of dipole ispresent, so an active noise control approach was used toreduce this effect. Consequently this led to better measuringresults and improvement of signal to noise ratio.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 13271579Some categories of workers are often burdened with a high impulse, sometimes with a high-energy impulse noise as a result of using different weapons and explosives. This is primarily for training and fieldwork police and military officials, to a lesser extent, to work pyrotechnics, miner, examiners explosives and the like. The tip of the bangs, which these workers are exposed to, as a rule considerably in excess of the threshold peak value of 140 dB(C), when working with heavy weapons in the army are such spikes extremely high and may reach or even exceed the level of 180 dB(C). This kind of exposure so dictate utmost care employers responsible for protecting the health of their workers, as usual sound-deadening measures, which in the vast majority of industrial and other noisy activities show an entirely appropriate in the case of exposure to noise more powerful weapons simply are not enough.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 6331489Noise generated and propagated under sea can produce harmfull effects for many species living there. Unfortunatelly, these effects were been almost completely neglected till now. The most frequent source of such noise are sea traffic, pile driving, sonars, use of underwater explosives, etc. It was for the first time, that some theoretical and practical investigations of underwater noise were organised in slovenian seawaters. This can serve as a basis for further steps in development and preparation of underwater noise legislation, in order to protect sea animals in slovenian waters.
F.15 Development of a new information system/databases
COBISS.SI-ID: 6341985Monitoring of health-related phenomena at workplaces is of utmost importance in the process of making workplaces safer and healthier. There exist several different occupational health indicators. A group of occupational health indicators on sick leave or sickness absence is a group of major indicators which provides information on the health status of the employed people. In this module, four basic indicators are presented indicating occupational health in general namely sick leave percentage, frequency index, severity index, and inactivation index.
C.01 Editorial board of a foreign/international collection of papers/book
COBISS.SI-ID: 31215321Speaker recognition methods are well knownand widely used in the ASR (Automatic Speech Recognition)systems. The use of these methods for the classification ofmachinery sounds in noisy environments is presented in thispaper. Influence of background noise was reduced by using ahighly directive sound recording, which can be understood asa spatial filter. A fusion of microphone antenna withbeamforming algorithm forms such a filter, which improvesSNR (Signal to Noise Ratio). Features of machinery soundshave been extracted using standard MFCC (Mel FrequencyCepstral Coefficients) parameterization method with Meland linear frequency scaling. SVM (Support VectorMachine) classifier was used for the classification of soundfeatures. A significant improvement of the classifier decisionperformance was achieved in noisy environment when 8microphones were used together with beamformingalgorithm. Results of using Mel and linear scale are alsopresented and show similar results in recognition ofmachinery sounds.
F.23 Development of new system-wide, normative and programme solutions, and methods
COBISS.SI-ID: 13271323