Noise environment

Loewen, L. and Suedfeld, P., Cognitive and arousal effects of masking office noise. Environment and Behavior 24(3), 381-395, 1992. 

Pearsons et al., 1976] Pearsons, K., Bennett, R., andFidell, S. (1976). Speech levels in various noise environments. Technical report, Bolt, Beranek, and Newman, Inc. 

Ability to detect signals and patterns in high-noise environments... 

Only Sensear s revolutionary SENS (Speech Enhancement, Noise Suppression) technology enables you to hear speech and stay protected in high noise environments while remaining aware of your surroundings. At Sensear, we are redefining the promise of Hearing Protection. 

X NRR 33 means maximum attenuation In maximum noise environments. 

Muffs Muffs are best for severe noise environments. Muffs are more effective for high frequencies than low frequencies. They have a cushion that fits against the head. There are various patented designs for attenuation. Some muffs can attach to helmets. Some manufacturers offer muffs with receivers and communication equipment built into them. That allows effective conununication among workers... 

Combination For the most severe noise environments, a combination of both muffs and plugs will achieve the greatest protection and sound attenuation. 

X With an NRR 26 rating. Pilot provides ideal hearing protection in more noise environments and more consistently for more workers. 

Cohen, I. and Berdugo, B.H., Speech enhancement for non-stationary noise environments. Signal Processing, vol. 81, pp. 2403-2418, 2001. 

Drucker, H., Speech processing in a high ambient noise environment, IEEE Trans. Audio Electroacoust., vol. AU-16, pp. 165-168, lun. 1968. 

The noise environment in most plants and communities varies from place to place and varies with time at any given location due to the composite of many noise sources. The noise... 

At any one location, a complete physical description of the noise environment might include its noise level at various frequencies as a function of time. It is common practice to simplify this multidimensional description by eliminating the frequency variable and measuring the A-weighted noise level, as observed on a standard sound level meter.The A-weighting filter emphasizes the mid-frequency components of the noise and demphasizes the low-frequency components in order to approximate the sensitivity of the human ear. 

Bobick, T., and D. Giardino. 1976. Noise Environment of the Underground Coal Mine. MSHAIR 1034. Brauer, R.L. 1990. Safety and Health for Engineers. New York Van Nostrand Reinhold. 

S.J. Chang, T.S. Shih, T.C. Chou, et al.. Hearing loss in workers exposed to carbon disulfide and noise. Environ. Health Perspect. Ill (13) (2003) 1620-1624. 

These technologies are now offering to workers an alternative that addresses the primary reasons why they have removed their hearing protection in the past Now in high noise environments workos have the ability to conduct safe convasations with thdr fellow workers eith face-to-face or via other critical commrmication devices such as two-way radios or Blrretooth cell phones. 

There are three main motivations for deploying seismometers in a downhole environment. The first is to provide quieter seismic noise environment to improve signal-to-noise ratios. The second motivation is to lower the cost of deployment of a seismic station. The third motivation is to reduce the environmental impact and land use costs by minimizing the physical footprint of a seismic station. 

The first item to consider in the selection process is the self-noise floor of the seismometer. The choice should depend on the noise environment that the sensor will be deployed in and on nature of the application. Ideally, site noise should be the limiting factor in the overall station noise, not seismometer self-noise. 

Young C, Chael E, Withers M, Aster R (1996) A comparison of the high-frequency (> 1 Hz) surface and subsurface noise environment at three sites in the United States. Bull Seismol Soc Am 86(5) 1516-1528... 

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