Soundproofing is the process of reducing unwanted noise and noise pollution, and in preventing noise from entering or leaving specific areas. Soundproofing materials and products absorb the excess sound in rooms, chambers and around pieces of equipment in order to create quieter environments for the purposes of worker safety, product testing, audio mixing and research etc.
To avoid damage to employees, products and equipment, facilities where excessive equipment noise is a concern use soundproofing products such as acoustic flooring to absorb floor vibrations or acoustic curtains to surround equipment, absorbing their sound. Acoustical ceilings, acoustic baffles, acoustic foam and acoustic panels are also common elements of sound proofing systems as they provide large surface areas of sound wave absorbent materials to reduce the reverberations within a space. Noise reduction and sound insulation have become important elements of construction and building layout as unwanted noise can not only be physically harmful and painful, resulting in hearing loss, stress and sleep loss; it can also decrease concentration, productivity, and peace of mind. Noise pollution from heavy traffic is a major concern in some areas, and sound barriers are often erected as a response. Some specialized applications such as recording studios, acoustical research centers or equipment testing procedures require customized soundproofing solutions, and anechoic chambers, which provide essentially dead space, are one example of this.
Soundproofing is not only required for testing chambers, studios and noisy facilities, but also for smaller equipment such as computers or domestic appliances, and for consumer machines such as cars or jet skis. Mufflers, grommets, shocks and vibration isolators are examples of soundproofing applied locally to equipment. Computers contain soundproofing materials, and computer workstations in offices are often housed in soundproof or semi-soundproof rooms. Sound isolation rooms, also known as audiometric booths, are available to audiologists, doctors, hearing aid specialists and hearing clinics for hearing testing and to gather more research on the way in which sound travels and works. Federal government regulations stipulate maximum noise levels in work environments, schools, offices, airports and other public buildings, often requiring these facilities to install a certain amount of soundproofing in order to remain functional and safe.
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filtering system in a sound meter that allows the meter to disregard
- The ratio of the sound absorbed to the sound incident on the material or device.
- A determination of the level of reverberation or reflected sound in the space for which the building materials are a factor. Acoustical analyses also determine how much acoustical absorption is needed to reduce reverberation and unwanted noise.
- The material used to change a sound field by absorbing, damping or blocking acoustical energy.
- The science of sound, which includes its creation, transmission and effects.
- The uninterrupted transmission of noise into the atmosphere. Airborne noise can be controlled by absorption or by being blocked.
- The sounds within a given environment from many different sources.
- A test chamber lined with absorbent acoustical material used to eliminate sound reflections and to determine the sound radiation characteristics of equipment.
- A unit of measurement referring to sound intensity. One bel equals 10 decibels.
- The process of dissipating mechanical vibratory energy into heat. Damping materials are used to apply to vibrating surfaces in order to reduce the noise radiating from that surface.
- The rate at which sound will fade when the noise source is removed, expressed in dB/sec.
- A unit of measurement referring to sound intensity that is equal to one tenth of a Bel.
- A device inserted into air ducts or openings that reduces the noise transmitted through the ducts or openings. Noise reduction is accomplished by using internal sound absorbing materials.
- The pathway along which sound travels around the perimeter or through holes within partitions or barriers erected to reduce the sound isolation between areas. Examples of flanking paths include ductwork, piping, back-to-back electrical boxes within partitions, window mullions, etc.
- Sound from an outdoor source where no obstructions exist.
- Amount in decibels that a specified signal can exceed to cause damage to the ears of a listener.
- Sound frequency expressed by cycles per second.
- The reduction of sound power levels reached by inserting a muffler or silencer in an acoustic transmission system.
- An acoustical treatment plan for enclosed areas in which one end is highly absorbent while the other is reflective and diffusive.
- The strength of the physical resonance of a sound to sound pressure and intensity, as experienced by a listener.
- A term referring to a sound of any kind, usually in reference to unintelligible or unwanted sound.
- Sometimes referred to as "dBA levels," it is used to assess listening conditions at ear level by gauging sound levels at loudest locations in a room.
- A range of frequencies where the highest frequency of the band is double the lowest frefquency of the band.
- The process in which structure-borne vibrations are converted into airborne sound.
- Sound waves that continue to bounce off surfaces after the source ends, until the sound waves lose energy and eventually die out.
- A test chamber designed so that the reverberant sound field within the room has an intensity that should be the same in every direction and at every point. It is often used to measure transmission loss and sound absorption.
- The unit of measure used for sound absorption consisting of the number of square feet of sound absorbing material multiplied by the material absorption coefficient.
- A thin layer of material sandwiched between two layers of absorptive material that prevents sound waves from passing through the absorptive material.
- Pressure waves traveling through the air or in other elastic materials.
- The acoustical process in which sound energy is dispelled as heat rather than reflected back to the environment as sound.
- An instrument used to measure sound pressure levels. Type 1 are precision instruments, whereas Type 2 are general purpose instruments.
- A measure of the total airborne acoustic power created by any noise source; it is expressed on a decibel scale referenced to a usual standard of 10-12 watts.
- A measure of air pressure changes caused by a sound wave and expressed on a decibel scale referenced to 20µPa.
- Creating an area insulated against noise.
- The transmission of energy from vibrating structures or solids into noise.
- Like those with structure borne noise, they are the wavering of a boundary that defines the motion of a mechanical system and can be reduced by isolators or damping.
- Cubic area of a space calculated by the length x width x height of the space. Volume influences reverberation time.
- Wavelike compressions and rarefaction produced by sound passing through air. Sound waves vary with frequency.