However, while surrounding noise is difficult to kill off entirely, it is possible to reduce its level to a great extent through the use of a clever algorythm known as active noise cancellation. This fundamental technique is used in premium noise-eliminating pairs of cans. But it is also what enables the Sony Xperia Z2 smartphone to "reduce up to 98% of the ambient noise" when paired with Sony's light and compact MDR-NC31EM earphones.
Active noise cancellation – the noise sound wave (1) is cancelled out with an inverted noise sound wave (2)
On a side note, while checking out the Sony Xperia Z2 at MWC 2014, we had the chance to personally test the effectiveness of Sony's noise cancellation tech. We can confirm that it works not only in theory, but in practice as well. Just keep in mind that results may vary depending on your environment. Noise that is too loud will be harder to reduce, and high-pitched sounds could be also tricky to eliminate.
The Sony Xperia Z2 lets you enjoy active noise cancellation with the Sony MDR-NC31EM earphones
If you're wondering how Sony has managed to put active noise cancellation in a pair of earphones so small, then allow us to elaborate on the matter. You see, a stand-alone active noise-cancelling headphone set usually has a battery and a digital signal processor built into it. These extra components, obviosly, take up some space. The Sony MDR-NC31EM earphones, on the other hand, don't have a built-in battery or any DSP circuitry inside of them – sound processing and battery power are provided by the device they are plugged into. This, supposedly, has also made the headset much cheaper to manufacture.
After reading all this, some of you are probably wondering whether or not Sony will bundle a pair of noise-cancelling earphones with each Xperia Z2 and Xperia Z2 tablet. Unfortunately, we can't give you a clear, universal answer since this will vary from one market to another. In some countries, the two devices will come with a Sony MDR-NC31EM out of the box, while in other markets, the headset will be offered as an optional accessory.
The Sony MDR-NC31EM headset provides active noise cancellation when used with the Sony Xperia Z2. It is light, compact, and wearing it won't mess up your hair