sound-pressure level

sound-pressure level

The level, 4 of sound pressure; equal to 10 times the logarithm of the sound pressure squared and averaged over a period of time, the reference pressure being 0.0002 dyne per sq cm (2 × 10–5 newton per sq m); expressed in decibels (abbr. dB).
References in periodicals archive ?
The LA3S-3ohm speaker designed for immersive sound applications improves our LA3S lineup, achieving a lower impedance that in turn allows a greater sound-pressure level (SPL) from the same amplifier.
We converted individual measurements of sound-pressure level to power levels (W) before performing statistical analyses because intensity (dB) is measured on a logarithmic scale.
We recorded sound-pressure levels using a Bruel and Kjaer 2,235 sound-pressure-level meter, a type 4155 1/2", prepolarized, condenser microphone, and an UA 0237 wind screen with a flat response to 16 kHz (Bruel and Kjaer, Naerum, Denmark).
There was no statistically significant difference in calling-song parameters or sound-pressure levels between taxa (Table 1).
6 ms after exposure to recorded traffic noise during sleep, and the slowing of reaction times was directly and significantly related to increases in both the frequency and sound-pressure level of the nightly noise events.
That means that 84db, the point at which we try to limit your daily exposure, is a sound-pressure level about 251 million times higher than the best hearing capability, which, over time, permanently will damage your ears.
When the values of sound-pressure level are compared separately in the height of one and two meters (Figs.
An increase of three dB suggests that the sound-pressure level has doubled, and this is about the smallest change in sound that we can hear.
The short duration of the energy makes it easier to cut the peak sound-pressure level to an acceptable level before it gets to our ears.
Fortunately for us, air is a less than perfect medium for sound to move through, and sound-pressure levels decrease quickly as they move away from the source.
A contour plot of the sound-pressure level at 500 Hz is presented on page 84.
Subjective sleepiness was assessed using the ESS, and snoring intensity was assessed using the highest one percentile ambient sound-pressure level attained while asleep during PSG.