Figure 10 shows the correlation between shear wave velocities obtained from
ambient noise analysis and SPT-N.
* Communication plus
ambient noise. n.a.--not applicable.
Only a few studies have documented ocean
ambient noise in the Arctic (Diachok and Winokur, 1974; Lewis and Denner, 1987; Roth et al., 2012; Kinda et al., 2013; Clark et al., 2015).
"Vertical Coherence of
Ambient Noise in Shallow Water overlying a fluid seabed," in J.AcoustSoc.Am, pp: 0001-4966/97/102.
When analyzing the data contained in the Figure 4, one should note that in the reference case when the test is performed without masking
ambient noise, the average percentage rate of correct responses was the highest, which was expected.
where the terms [S[([omega]).sub.NS] and S[([omega]).sub.EW]] and [S[([omega]).sub.V]] are the ratio of the horizontal and vertical spectra of
ambient noise respectively and m is the angular frequency.
The upper two data records were made in the environment with a 55 dB SPL
ambient noise level.
In fact, our lives will be ruined by
ambient noise levels.
The system also leads to lower
ambient noise, according to LG.
The researchers suggest that mass transit riders reduce noise exposure using earplugs or earmuffs--but not headphones or earbuds, since wearers often turn up the music to drown out
ambient noise.
This is said to result in the optimum combination of warning capability and annoyance reduction, unlike the wider range of frequencies used by broadband alarms which may result in a sound that easily blends with
ambient noise and is too different to be recognized as a warning signal.
According to the company, Ultimate Ears by Logitech earphones deliver customised comfort by creating a seal between the ear and the outside world, limiting
ambient noise. Both the MetroFi 170s and the 220s provide 16 dBs of noise isolation, enabling users to hear the music clearly without being cut off from the outside world.