Abstract The paper examines the effect of acoustic excitation at broadband frequency range (100 - 650 Hz) on separated boundary layer developing a flat plate subjected to an adverse pressure gradient. experiment was conducted with low inlet turbulence intensity level (Tu < 1%) in order provide cleaner environment that magnifies effects frequency. It shown sound levels: SPL=125 and 135 dB, ca...

The sound pressure level (SPL) of vowels received by a listener reflects several non-linguistic and linguistic factors: It varies as a function of distance, vocal effort, and vowel quality. Increased vocal effort involves, in addition to an increase in SPL, an emphasis of higher frequency components and increases in F0 and F1. This should allow listeners to distinguish it from decreased distanc...

sound pressure level (SPL) directly; however, in certain populations (such as infants and children) the probe tube may not be tolerated for extended periods of time. An alternative is to derive (sometimes called “predict”) the real-ear SPL by adding an individually measured acoustic transfer function to both, the audiometric and electroacoustic data. The acoustic transfer function in question i...

GLOSSARY OF SYMBOLS r distance from pressure sample point to center of piston a radius of circular radiator R_ dc resistance of driver voice coil ao radius of diaphragm, = _/SD/_r E surface area ay radius of circular vent, = 5/Sv/_r SD effective projected surface area of driver diaphragm c velocity of sound in air, = 343 m/s Sv cross-sectional area of vent ein voltage applied to driver input SP...

We determined the audiogram of Phyllostomus hastatus (the greater spear-nosed bat), a large, omnivorous American leaf-nosed bat native to Central and South America. A conditioned suppression/avoidance procedure with a fruit juice reward was used for testing. At an intensity of 60 dB sound pressure level (SPL re 20 microN/m(2)), the hearing range of P. hastatus extends from 1.8 to 105 kHz, with ...

The sound pressure level (SPL) of vowels received by a listener reflects several non-linguistic and linguistic factors: It varies as a function of distance, vocal effort, and vowel quality. Increased vocal effort involves, in addition to an increase in SPL, an emphasis of higher frequency components and increases in F0 and F1. This should allow listeners to distinguish it from decreased distanc...

Stimulated by a recent paper by Platt and Racine (1985), we discuss the factors that probably are involved in certain inconsistencies observed in pitch judgments of tones with different spectral composition. Typically, discrepancies reported in the literature are of the order of 10 cents in magnitude. We point out that measurement of such small pitch effects is heavily dependent on systematic i...

Ocean noise is an important component of the ocean soundscape. Due to vastness, performing accurate monitoring challenging and requires cooperation between institutions which, in most cases, use different equipment with characteristics. To ensure a valid comparison sound pressure level (SPL) outputs, careful calibration common standard absolute requirement. Throughout years several tools were d...

The human ear is a complex biomechanical system and is divided into three parts: outer, middle and inner ear. The middle ear is formed by ossicles (malleus, incus and stapes), ligaments, muscles and tendons, which transfers sound vibrations from the eardrum to the inner ear, linking with mastoid and Eustachian tube. In this work, a finite element modelling of the tympano-ossicular system of the...