How Do Passive Noise Cancelling Headphones Work

It is quite unfortunate that for most music lovers, there is a myriad of ambient noises and sounds that can really interfere with the music coming from your earphones, Now, if you have ever once tried to listen to music on a bus, train or airplane, then you are intimately familiar with this problem. The engine’s roar and/or the incessant chatter from fellow passengers, make extremely hard to hear the sounds coming from your speakers, even if they are on or inside your ear. Fortunately, to combat this dilemma, innovators have come up with far more enjoyable way of listening to your music- Noise canceling headphones of which there are two types:

– the active- the passive types.


The simplest type of noise cancellation is the passive noise reduction, sometimes called noise isolation. From a technical perspective, just about any kind of earphones are able to provide some degree of passive noise reduction (though some are designed for it more than others). This is mostly as a result of the materials used to make the headphones which block out particular sound waves, mostly those of a higher frequency. The absolute best type of passive noise canceling headphones are however the circum-aural types which are specifically engineered to maximize the amount of noise it filters. We will take a look at this some more in a bit. Essentially, where passive noise isolation, the head phones are so designed that they will fit snugly into or around each ear. This makes it significantly harder for noise to escape and bother others in your immediate environment, and it also prevents the noise in your environment from making it hard for you to listen to your music. Passive noise cancellation earphones tend to have very large ear pieces, with large pieces of foam wrapped around them. You need to squeeze the foam into your ear which them provides a perfect seal for the ear canal, or they fit just right around your ear.

All this is saying that passive noise cancelling earphones in essence imitate what happens when you choose to cover your ears with your hands or put some ear plugs in. The excess padding is always done with materials that naturally act as sound barriers- fitting into your ear and sealing off the ambient noise.

Supra-aural headphones, which are earphones placed over and around the ear, instead of in or around it, are probably the very worst at any form of sound cancellation. They tend to be low density, small and very light, as such there is really not much padding to block and outside sound or ambient noise from entering the ear. Furthermore, because they are only placed on the ear, there is a great deal of space for any external noise to travel around them and into the ear canal. It is on very rare occasions that you actually find a top quality supra-aural earphone, because they are simply unable to provide the kind of noise cancellation that circumaural or in ear headphones provide. Supra-aural earphones are lightly manufactured and as such are usually marketed for customers who are not particularly focused on headphone quality, but mostly looking for basic functionality.

Take for instance, most desktop or video game headsets tend to be supra-aural. They are mostly preferred because they are light and as such are suitable for the long, extended hours they will be used. Additionally, in cases like these audio quality is not of great importance since it they are mostly used for spoken communication, where clarity is the focus and nothing else really matters.

When it comes to passive noise cancelling headphones, circumaural or around the ear headphones provide a significantly better noise cancellation quality. They are bigger in size and as such they include more noise reduction material. This in turn creates a far better buffer against outside noise- think beats headphones. Essentially this means that they are heavily packed with layers of high top quality high density foam,, or some other sound absorbing material. Admittedly, this then makes them a bit heavier than the average headphones, but since they completely block the ear off, they keep out up to 95% of outside noise. Well, this is assuming that the circumaural earphones you choose, fit your ears snugly. If they are either poorly designed or not the perfect fit then ambient noise will still be able to make its way in.

Would you wear sunglasses that double as headphones?

Google Glass may be on hiatus, but our appetite for high-tech spectacles endures. One of the latest efforts comes in the form of a Kickstarter campaign for a pair of sunglasses that double as wireless headphones.

Buhel’s Bluetooth SG05 SOUNDglasses obliterated their $80,000 fundraising goal a mere 48 hours after launch, ending up with more than $400,000 by the end of the campaign. “SOUNDglasses give you innovation, freedom, safety, and easier life,” Buhel promises.

Great, but how will the music sound?

Thanks to “bone conduction technology,” SOUNDglasses let users listen to music, conduct a phone conversation, or talk to computerized personal assistants like Siri without the “impediment” of earphones. Two speakers situated in the glasses near the wearer’s temples send vibrations through the bones of the head and into the inner ear. A built-in microphone picks up what the wearer says.

This isn’t exactly revolutionary. Many hearing aids transmit sound with bone conduction, as do other headphone brands. But a main complaint for these kinds of headphones is that the sound quality leaves a lot to be desired. Will these be any different?

Here’s how the creators of SOUNDglasses address that question: “We don’t pretend that Bone Conduction is your perfect HiFi music companion, but we can say that it serves a specific purpose, which increases your safety in an infinite number of situations. The military and Google chose Bone Conduction for some of their devices…They must have thought it was not that bad, and so did nature with dolphins and whales.”

Hmm. Not the most reassuring comment, is it?

Buhel is pushing the safety angle hard to make up for any lousy sound quality. Because nothing has to actually go inside the ear for this technology to work, wearers will still be able to hear the sounds going on around them. This is a plus for what seems to be Buhel’s target demographic: athletes. It would be great to be able to bike down the busy avenues of Manhattan blasting some excellent riding tunes without losing access to one of your most vital senses.

Another problem: using these headphone-less glasses to have a phone conservation could produce some funny looks from passersby. To convince people to accept this kind of public embarrassment, any headphone-glasses combo will have to be excellent in every other way. Sound quality is important, but equally essential is style.

The SOUNDglasses come in a variety of colors and lens shades, and from the outside seem no different from your average sporty shades. This is rule number one for smart glasses: they have to be something you actually want to wear in public. Google found this out the hard way. Not even its own developers wanted to wear the goofy-looking face computer. Of course, SOUNDglasses don’t actually project any visual effects into a wearer’s line of sight, which probably eliminates some of the encumbering hardware that could inhibit a sleek design.

What would make these glasses better is if they came in a variety of frame styles. Right now, the only design on offer looks best on athletes and outdoor explorers, but doesn’t have much fashionable appeal otherwise. Google Glass got a trendy redesign to provide some fancy frame options because it knew it needed to look less geeky if it wanted to be worn by anyone other than, you know, geeks. The same goes for SOUNDglasses, especially if it wants to catch on with anyone other than athletes.

The first shipment of glasses to Kickstarter backers is slated for May of 2015. If you want to wait for the first reviews to roll in before buying, they will retail for “more than $270” later in the summer.

Well if you had said to us, how about a sunglasses/headset mash-up we would have thought you were mad! but this kickstarter, using bone conductive technology, too which we have lots of knowledge about, We’re looking forward to receiving our pair when they are dispatched. This article was originally posted on this site.

Review of the Motorola DP2600 Two Way Radio

When it comes to creating of digital communications throughout your company, MOTOTRBO digital radio solutions can help keep all your employees connected. The Motorola DP2600 is a hand-held two-way radio that comes with all the latest digital technological advances. These small portables deliver on affordability and high digital quality, allowing all of your employees to speak and hear clearly regardless the working conditions.

The Motorola DP2600 display model features programmable buttons, 16 channel capacity, and water protection IP55 specifications. The volume of the radio adjusts automatically to be able to compensate for any background noises. This best-in-class technology provides a scalable solution for any communication needs within the company. The crystal clear screen allows easy navigation and install call recognition.

The reason the DP2600 is so versatile is because it is available in both VHF and UHF frequencies, with a two-line display and simple to navigate keypad that is able to handle up to 128 channels. The three programmable buttons are simple to access, the tricolor LED provides crystal clear visual feedback on the status of the operating system of the radio. The screen is easily viewable day or night, and the large textured talk button is easy to find in any conditions.

Some of the reasons the DP2600 has become one of the popular choices in the construction and assembly line industry is the compact design and the noise reduction capabilities and safety features.. The ability to switch between group or individual calls is simple, while the PTT ID is designed to simplify the system disciple and efficiency of communication. The remote monitoring system ensures employee safety while on the job by enabling quicker assessment of the remote users status.

Calls received on the DP2600 connect on the first time thanks to the unique channel scanning technology. No tools are needed to attach remote accessories to the DP2600 because it comes equipped with an accessory connector. Through the software purchase you can upgrade the radio privacy feature, transmitting interrupt, and five tone signalling. The DP2600 comes with VOX capabilities and Intelligent Audio for automatic volume adjustment to compensate for any degree of noise within the workplace that could affect sound quality.

This hand-held two-way radio IP55 sealing ensures continued operation in the harshest of working conditions. Equipped to handle multiple site coverage with the IP site connector, the DP2600 will keep everyone in the pipeline in communications with each other via the Capacity Plus and Lined capacity Plus features.