Perception of Vibration and Acoustics

TITLE ABSTRACT
Noise Control at the Ear by Hearing Protectors The noise causes a masking effect that disturbs verbal communications. The noise limits the perception of acoustic signals of security with an increased probability of accidents at work. The noise increases the mental fatigue and decreases the efficiency of the work performance. The level of exposure to noise by hearing protectors can be estimated by the methods specified by two standards BS EN ISO 4869-2 and BS EN 458. In this paper we compare the methods using different hearing protectors. [DOI:10.12866/J.PIVAA.2013.09.003]
Dose Response Relationship between Exposure to Hand–Arm Vibration and Health Effects among Dentist at Workplace
Dentists have neurological symptoms in the dominant hand. In this paper, examining different stages of processing in a dental laboratory, we analyze noise and mechanical vibrations. The investigation allow us to assess the exposure to noise and vibration of the worker and to identify the stages of processing more harmful to the health of the worker. The vibration exposure can be analyzed on the hand–arm system of the worker by means of the cross–correlation of the noise and of the accelerations in the time domain and in the frequency domain. [DOI:10.12866/J.PIVAA.2013.09.004]
Blind Speech Dereverberation The aim of this paper is to show the leading research directions in blind speech dereverberation, and in particular to discuss the methods based on the explicit estimate of the inverse acoustic system, known as reverberation cancellation techniques. [DOI:10.12866/J.PIVAA.2014.09.001]
Evaluation of Stevens’ power law exponents for whole–body vibration by psychophysical methods
Several advantages stimulate research to knowledge of the mathematical relationship between the physical and perceptual worlds. The discomfort of human subjects exposed to a wide range of vertical mechanical shocks, sinusoidal vibration, road vibration, random vibration have been studied experimentally. Experimental investigations on difference thresholds for the perception of vibration can assist the optimisation of comfort in transport. Researches have suggested methods to evaluate how sound and vibration influence opinions of living, working, and travelling environments. Psychophysical test methods, vibration stimulus range and test participant estimate the Stevens’power law exponent achieved from subjective testing. Using both the absolute method of magnitude estimation and the relative method of magnitude estimation, many Authors have obtained the exponents for scaling the subjective magnitude of sound. However, the relative method of magnitude estimation has been used the scaling to evaluate the subjective magnitude of vibration. The recommendations of the International Standards Organization on human vibration exposure are critically compared with the results of other researches.[DOI:10.12866/J.PIVAA.2015.01.01]
Evaluation of psycometric function of vertical whole–body vibration on a rigid seat by statistical distribution functions
The psychometric function relates an observer’s performance to an independent variable, usually some physical quantity of a stimulus in a psychophysical task. We consider the peception of whole–body vibrations just with vertical sinusoidal excitations. This paper describes an integrated approach to fitting psychometric functions and assessing the goodness of fit. [DOI:10.12866/J.PIVAA.2015.06.01]