Posts Tagged ‘Noise’

White Noise Machine ? Achieve Better Performance and Focus With Sound

Many people have heard of white noise but few have a really, good understanding of what it is and why it is used. White noise in simple terms is a combination of all frequencies of sound audible to the human ear blended together. (Just as white light is composed of all frequencies of light). White noise sounds like a hiss, similar to radio static or the sound of rushing air when traveling by airplane.

Although there are many uses for white noise, we often see corporations using a white noise machine or system to “quiet” a department. For instance, if a company had a department full of computer operators, all clicking away at the keyboard, the sound would become overwhelming and distractive. The same would be true for a customer service department with employees all talking to customers on the phone. By using a white noise generator, sound is greatly minimized.

Millions of people around the globe struggle with getting a good night’s rest. For some, the problem is environmental, such as rooms that are too light, uncomfortable bedding etc. while for others it is merely a problem of tuning out the day’s events. Regardless, a white noise generator produces a sound that is calming. While perfect for everyone, people who work nights and sleep during the day or those in large, noisy cities, really benefit from a white noise machine by being able to block outside traffic and other unwanted sounds.

Okay, so how do white noise generators work? Random sound frequencies are produced in order to blend with the unwanted environmental noises in order to essentially mask them. The special sound created is one to three decibels above a normal conversational voice, which actually makes it nearly impossible for a human being to realize when white noise is being used. Additionally, white noise machines generate random audible frequencies that are distributed equally over the entire range of human hearing, which is what allows them to be so effective.

You will also find white noise machines used in unique situations. For new parents, getting a full night’s sleep is rare. The calming sound of white noise can often help your baby to sleep better. There are many types of sound conditioner on the market today some of which can also produce natural sounds such as waterfalls, surf, or even simulate a mother’s beating heart. Some sound conditioners offer five, ten, or more options of natural sound combined with white noise in order to create a soothing and relaxing environment that is conducive for sleep. Also, white noise generators offer a portable and compact privacy solution. Most machines are volume adjustable, and best of all, they are an easy and affordable remedy to an otherwise noisy problem.

There are many different companies that sell white noise machines. Be sure you purchase your machine from a reputable company, one that can guide you to the appropriate size and type that is suitable for your needs.

Adam Boyce writes articles on white noise machine. For more information about white noise generator, sound conditioner visit sleep sound machine.

Be the first to comment - What do you think?  Posted by admin - March 21, 2010 at 6:01 am

Categories: Audio   Tags: , , , , , , ,

Sound Absorption and the Noise Reduction Coefficient (nrc)

When sound waves travel through air and encounter another medium, the wall of a room, for instance, a portion of the sound will be absorbed by the wall while the remainder will reflect from the wall surface. Add to the mix the other surfaces reflecting sound waves in various directions within the room, and the result is a jumble of sound reflections which interfere with the clarity of the original, intended sound. The presence of numerous hard, untreated surfaces is often to blame for the heightened noise levels in busy restaurants as the voices of multiple patrons reflect and produce background noise. Acoustical improvement and sound reduction projects often involve the implementation of treatments designed to absorb sound wave reflections as a part of a comprehensive sound control plan.

Taking into consideration the tendency of sound waves to reflect from surfaces, it is apparent why the absorption of sound reflections is an important element of sound control and acoustical improvement. Capturing sound reflections becomes particularly important in environments such as auditoriums, restaurants and places of worship, where the quality of acoustics experienced within an area is fundamental to its purpose.

The reflective tendencies of the particular surfaces present within a room may contribute to the type and extent of sound absorption treatment necessary to achieve the desired result. Carpet, for instance, is more absorptive than tile, so a carpeted floor would produce less significant sound reflection than would a tile floor with other factors constant. How do we know? By performing the standard ASTM C423 test, independent labs quantify the amount of sound a particular surface material absorbs and assigns to it a value referred to as the Noise Reduction Coefficient (NRC). The NRC, calculated based on testing of a material at various frequencies within a concrete enclosure, can be interpreted as a percentage of noise that is captured and converted by a surface while the remaining portion is reflected. A NRC of 0.44, for instance, would be assigned to a surface which on average absorbs 44% of sound while reflecting the remaining 54%.

Like materials used in construction, soundproofing products are also tested for sound absorption at various frequencies and assigned a Noise Reduction Coefficient. The absorptive value exhibited by a particular sound treatment can help determine the circumstances in which the treatment should be applied. A project aimed at controlling low bass tones, for example, would call for more absorptive treatments than one targeting the higher frequencies produced by the human voice. Since each acoustical improvement solution must be tailored based on characteristics of the targeted area and frequencies to be controlled, it is advised to consult with a knowledgeable soundproofing consultant prior to implementing sound reduction treatments in order to ensure that critical variables are addressed.

About the Author: Mark Rustad is President of NetWell Noise Control, based in Minneapolis, MN. Founded in 1991, NetWell is a leading supplier of acoustic products, soundproofing treatments, sound reduction products and online acoustical consulting services. NetWell?s sound management skills are packaged into the industry?s premier website. Discover first hand why so much of NetWell?s business stems from the referrals and repeat orders they receive from satisfied clients around the world.

Be the first to comment - What do you think?  Posted by admin - March 10, 2010 at 7:56 am

Categories: Audio   Tags: , , , ,

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