Low-Frequency Acoustic Fire Extinguisher!

George Mason engineering students Viet Tran and Seth Robertson developed an acoustic fire extinguisher using low frequency (bass) sounds, and have released a demonstration video of their prototype extinguisher in use. From CNN.com: Boom out da fi-ya! Bass out da flames! Firefighters may be snuffing blazes with deep-toned sound, if a new device invented by two engineering students in Fairfax, Virginia, catches on. Viet Tran and Seth Robertson’s new fire extinguisher looks a little like a conventional one, but instead of a compressed air tank spewing out chemicals, theirs has a loudspeaker the size of subwoofer drumming out sound waves. It’s not much to listen to, just a low hum, but when pointed at flames, it makes them vanish. In a way, it’s like blowing the fire out, because sound waves are basically multiple, regular blasts of air. Click here to visit the original...
STC Testing to Evaluate Privacy Concerns

STC Testing to Evaluate Privacy Concerns

What is Noise Intrusion? Noise is typically defined as any unwanted sound. Unwanted sound can distract us from our daily lives (sleep, work, and personal time). While poor sound isolation is often attributed to noises we don’t want to hear, it can also result in sounds we don’t want heard. This can occur in Medical Office Buildings (MOB) where HIPAA speech privacy requirements dictate patient-doctor conversations remain private. Federal and State governments also have confidentiality requirements for specific spaces in their facilities. In residential multi-family dwellings such as apartments, condominiums, and townhomes, privacy complaints can become a problem that Homeowners Associations (HOAs) must address. Building codes also have minimum sound isolation criteria for multi-family dwellings. Wave Engineering can perform field tests on existing wall and floor-ceiling assemblies (in offices, residential units, townhomes, etc.). We then use the test data to identify the problem and recommend solutions. Sound Transmission Class – STC Tests The Sound Transmission Class (STC) is a single-number rating used to quantify the sound isolation of a wall or floor-ceiling assembly. The higher the STC, the better the partition is at reducing sound transmission between spaces. STC tests are usually performed in an acoustic laboratory. In an existing building, Apparent Sound Transmission Class (ASTC) tests are performed. ASTC tests require us to generate loud pink noise on one side of the partition, and to measure the sound level on both sides.  We must also measure reverberation time on receiving side.  A typical test takes one to two hours to complete.   For more information on the ASTC test services Wave Engineering offers, please visit our ASTC Services...