Microphone was used to measure the sound pressure
level which was placed above the surface of material.
He discusses how impedance affects the propagation of sound waves; the significance and units of the other physical values of sound pressure
, speed, energy, power, and intensity; the reflection and transmission of sound waves on a discontinuous surface; how radiation, scattering, and diffraction depend on the spatial distribution of a discontinuous surface or the pattern by which an impedance mismatch is distributed in space, and how change in sound depends on the size and form of the space propagating it.
levels measured in the ear simulators of the HATS must be corrected to free field response and then A-weighted and averaged.
Its high sound pressure
levels at close range can lead to permanent hearing loss for unprotected ears after extensive exposure, with a sound pressure
of 120 dB (the threshold of pain) at one metre from the horn opening.
The initial report (1) provided the maximum instantaneous A-weighted sound pressure
level (Lmax Fast [dBA]) averaged for 2 recordings during single vuvuzela blasts at 4 distances from the bell of the vuvuzela.
If the quietest sound you can hear measures 3db, then the sound has to be twice as loud before you can hear it, because each 3db increase doubles the sound pressure
of the one below it.
They plugged their headphones into the ears of a specially designed head, which measures the sound pressure
and glows amber or red if the sound is up too loud.
I have rented high-end sound pressure
level meters for testing and have not been completely happy with the results, as they occasionally favored bows that were clearly louder--more abrasive--than other bows.
Given the high efficiency of liquid versus air we are able to turn those fans at a much lower speed, and thereby the overall acoustic and sound pressure
level is lower," said Mike Diehl, HP product manager for workstations.
Company's Digital Sound Level Meter is an easy to use instrument that can measure and monitor the sound pressure
level in a variety of industrial environments.
Table 2 presents the maximum values of each measurement of sound pressure
in decibels on an A-corrected scale, and the average noise level during the measurement period.
The peak sound pressure
level at 6 meters was 109 dB (A).