Noise Reduction Using Headphones

You can substantially reduce the sound around you with specialist noise reduction headphones. We’re Place Over Ears and here’s our helpful guide to how you can reduce the unwanted noise from your day, using a variety of headphones, including headsets that use a technology called Active Noise Cancellation (ANC) to suppress external noises and that help to keep them away from your ears.

An image of a man attempting Noise reduction in a busy subway with headphones

In busy environments you can achieve a degree of noise reduction by using specialist headphones

Why Attempt Noise Reduction?

During our day our ears are bombarded with a range of background noise; from people talking in our office, to the rumble of the train on our commute home. While we don’t actively ‘hear’ many of these noises, our brain is working behind the scenes to filter them from our attention so that we can keep typing up that report at our desk or reading our book on the train.

We know that environmental noises have a detrimental effect on our well-being when we fly.

Research in 2011, led by Dr. Brett Molesworth1 suggested that as people become exposed to (aircraft cabin) background noise for long periods while in the air, they suffer from negative effects, including;

  1. They are more likely to experience mental fatigue
  2. They have a decreased ability to recall information
  3. They experience higher levels of reported stress and they perceive their workloads as more arduous

So if we know that some types of background noise, like the drone of an airplane cabin is detrimental to our feelings of comfort and can induce stress, this might suggest why we feel distracted and more tired over long periods of time in a busy environment where we need to concentrate (to generate ideas or to check the details in an important report, for example).

If you want to relax more by reducing the working noises around you, you have two routes; either block it out by sealing your ears away noisy people and things around you or you can employ a combination of blocking out the sound and masking it with a sound processing system.

How Does Noise Reduction Happen with Headphones?

It’s important to mention here that it’s very, very difficult to completely block all noise from your ears, or completely isolate the music or movies you want to playing into them. If you are investing in some noise reduction kit, we suggest that you have three options;

An illustration of the different types of noise reduction methods

Noise reduction by headphone leaves you with three options, by ear protection, by active noise cancellation, and headphones

Ear Protection

The greatest level of noise reduction is usually offered by ear protection products like earplugs and headband ear defenders, whose primary function is to protect your ears, not to offer you the sounds from your latest Spotify playlist. They exist to fundamentally seal your ears away from all noise and while some ear defenders (like the ones worn by stage crews and racing team pit crews) are also headsets which feature sound and a microphone for radio communication. Unless you are working around a jet plane rather than sitting in it, it’s somewhat unlikely that ear defenders are going to be on your list!

Headphones

Like their distant, ear defending cousins, isolating headphones use an over-the-ear technique (pop them over your ears) or an in-ear approach (pop them in your ears) to seal noise away from your ears. All headphones could really be called noise isolating because no matter how inexpensive or beautifully packaged they were, all earphones will have some noise reduction capability (but it could be really small, like open-backed headphones) so if you want to rely on this style of earphone to block out sounds, we strongly urge you to try out a pair in a shop before you commit, because a headphone’s isolation personality is shaped by the quality of the materials used and the style of the headphone (closed back headphone, verses an open-back headphone, etc.).

Active Noise Cancellation (ANC)

Noise cancelling headphones, like the pair of Sony MDR-ZX770BNB in the picture take the best features of noise-isolation and on top of this apply an active, always on-the-go audio processor which listens to your external soundscape and reverses this sound.

A pair of Sony MDR-ZX770BNB active noise cancellation headphones

Reversing the Sound – Active Noise Cancellation

Reverse the sound? What an earth are we talking about?

Active noise cancellation headphones like our Lindy BNX-60 house an onboard audio processing circuitry that, via external microphones, listens to your surroundings, and then attempts to produce an inverted sound wave, the opposite audio picture of your environment. This blanket of negative noise is continually integrated by the headphones into their audio output. This method of noise reduction is called ‘‘destructive interference’ and presents some of the best noise cancelling advances in the world today, so good that it’s used by airline pilots to communicate with air traffic control at 32,000 ft.

Headphones like these will often quote their noise cancelling capabilities in tested environments at a specific frequency range (the type of sounds they can mask). For example, Audio Technica’s ATH-ANC9 claim 95% noise reduction at the lower frequency range of 200hz.

It’s important to remember that you shouldn’t use headphones or active noise cancelling headphones as replacements for ear protection equipment in loud environments as without sufficient protection you could damage your hearing.

Some Final Things…

  • Batteries – Active noise cancellation headphones relies on a small power source; hence these headphones either come equipped with an on-board rechargeable battery or require an alkaline battery replacement every now and then.
  • Uneasy – some people just don’t get on with ANC, there are sporadic reports that these headphones can produce sensations of being underwater or nausea, (while this is very infrequent it’s another reason to try them out first)
  • Stay safe – Noise reduction headphones don’t discriminate between noise! When you hear less around you, you could be prone to accidents or you could miss important warning sounds. Never using active noise cancellation while driving or cycling, or operating machinery that relies on audible safety warnings.

[1] Molesworth, B., Burgess, M. and Kwon, D. (2013), “The use of noise cancelling headphones to improve concurrent task performance in a noisy environment” Applied Acoustics, 74 110-115.