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Noise Canceling


— Automotive

GM uses active noise cancellation technology to improve fuel economy

By - September 14, 2011
Charged with the task of getting the fuel economy of the 2011 Chevy Equinox down to 32 mpg on the highway and beat out the 28 mpg-rated Honda CR-V, Toyota RAV4 and Ford Escape, GM engineers employed some rather unconventional fuel efficiency technology – active noise cancellation (ANC). By using the same technique used in noise cancelling headphones, the team was able to let the Equinox’s engine run at a more fuel efficient rpm without the associated low frequency noise and achieve what GM claims is segment-leading fuel economy. Read More
— Health and Wellbeing

Etymotic HD-15 electronic earplugs only block the loud noises

By - September 1, 2011 3 Pictures
If you work someplace where sudden loud noises frequently but intermittently occur, it can get kind of frustrating – you pretty much have to choose between protecting your hearing with ear plugs, or being able to hear what people are saying when it isn’t noisy. Your basic earplugs, unfortunately, don’t let you hear when things are quiet, but then activate when loud noises occur. Non-basic earplugs, however, do that very thing. Etymotic Research’s HD-15 High-Definition electronic earplugs contain tiny microphones, that instantaneously cause the plugs to block incoming sound waves when they detect noises over a given threshold. When the noise has ceased, the earplugs let the user hear normally again. Read More
— Electronics

RotoSub self-silencing fans promise a quieter way to keep electronic components cool

By - August 8, 2011 2 Pictures
Silicon chips shuffling all those electrons around inside modern PCs, gaming consoles and home theater systems generate a lot of heat that needs to be dissipated to stop the machines going into meltdown and ruining your day. Fans are the most common form of cooling for modern electronic devices but they can generate a lot of noise that can leave your lounge room or study sounding like an airport runway. Sweden-based company RotoSub has developed an active noise control (ANC) system that is built into the fans themselves that promises to almost eliminate the fan’s mechanical noise and leave little more than the sound of the air blowing through the fan. Read More
— Science

Acoustic diode allows sound waves to only travel in one direction

By - July 27, 2011
When it comes to the sound-proofing of buildings, most people likely think of using materials that simply absorb the sound waves in a noisy room, so they can't proceed into a neighboring quiet room. Researchers at the California Institute of Technology (Caltech), however, are taking a different approach. They have created something known as an acoustic diode, that only allows sound traveling through it to go in one direction. If incorporated into building materials, such diodes would let sound travel from the quiet room to the noisy one, but would simply block noise transmission in the opposite direction. Read More
— Automotive

Noise Snare – photo radar for loud vehicles

By - May 20, 2011 2 Pictures
It’s a situation that everyone has experienced – you’re walking down the street, when a vehicle drives by that’s so loud, people cover their ears and cast angry glances at the driver. You assume that it’s illegal to use a muffler that’s so ineffective, or to have a stereo turned up that high, but if it is ... how come so many people seemingly get away with it? Well, part of the reason is manpower. While speeders and red-light-runners can be ticketed in the thousands using automated systems, actual police officers need to go out and manually check cars and motorcycles for noise violations. The designer of Noise Snare, however, claims that his unmanned system can automatically detect and identify overly-audible vehicles. Read More
— Music Review

As BlackBox goes global, we go hands-on with its C18 earphones

By - May 4, 2011 11 Pictures
Armour Home recently announced that it has been appointed worldwide distributor of Phitek System's BlackBox range of Active Noise Rejection (ANR) headphones and earphones. Phitek says that the level of ambient background noise can reach 60dB in a busy street, 80dB in the office and up to 94dB in the cabin of a passenger jet. The company claims that its technology is capable of reducing ambient noise levels by 90 percent or more, and I've been sent some C18 in-ear phones for review. Read More
— Good Thinking

Noise-canceling device plugs into your MP3 player, removes sound of dental drill

By - January 14, 2011
Hands up, who doesn't get just the teensiest bit nervous about going to the dentist? Not many of you, I'll wager. Dentophobia – fear of dentists and dental care – is one of the most common phobias, and it's the high-pitched whine of the dentist's drill that causes most anxiety. If this applies to you, take heart. You may soon be able to relax (or at least tune out the sound of the drill) and listen to music on your own MP3 player, connected to a noise-canceling device developed by Kings College London in conjunction with Brunel University and London South Bank University. Read More
— Music

Sony's new Walkman S750 goes super-slim

By - September 21, 2010 6 Pictures
Nowadays most of us take portable media players pretty much for granted but back in the 1980s, when Sony released its first personal cassette player, they were revolutionary. Thirty years on and cassettes have all but gone and, despite numerous other worthy contenders, Apple holds the media player crown. For many, however, the Walkman is still regarded as the media player of choice and Sony has just revealed a new addition to its iconic family, the supermodel-thin S750. The audio and video player features noise canceling, audio enhancement technologies, a Karaoke mode and 50 hours of audio enjoyment on a single charge. Read More
— Wearable Electronics

QUIETPRO+ Intelligent Hearing System headed offshore

By - July 29, 2010 3 Pictures
It’s a problem as old as the protective earplug itself - if you block out the loud, harmful noises, you also block out the quieter sounds, such as peoples’ voices... that is, unless you’ve got a QUIETPRO+ Intelligent Hearing System stuck in your ears. The setup consists of a pair of fairly regular-looking in-ear plugs, wired iPod-style to a small electronic control unit. When the system detects a dangerously-loud noise, it automatically sends noise-canceling sound waves to the headset. When things are quiet, it amplifies sounds like human voices, so the user is actually able to hear better than they would without it. Read More
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