Noise Cancellation-Active & Passive
Many types of ambient sounds can interfere with or even block the sounds coming through their headphones. If you try a headphone on the plane, then you know the problem well: The roar of the engines makes it difficult to hear the music through the speakers. Fortunately, noise-cancelling headphones can provide a more enjoyable listening experience.
Noise cancellation in headphones is a system by which unwanted sound from outside does not interfere with the music being piped in by source. There is two type of noise cancellation in headphones. Passive and active noise cancellation. There is two jargon used in the headphones industry. Noise isolation headphones and noise cancelling headphones. One should understand the difference. This is what we are putting up here without involving much of technical words.
What is PASSIVE NOISE cancellation
Passive noise cancellation is also called” Noise isolation”. In such case, physically noise is stopped to come in the ear canal by using heavy sound absorbing the material. That means they are packed with layers of high-density foam or other sound-absorbing material, which makes them heavier than normal headphones. The idea here is a physical barrier between your ear and the offending sounds. It all depends on how good is a seal to stop the unwanted sound coming from the neighbourhood. Noise isolating headphones, at best, can muffle everything around you quite well. The only problem is, In-ear models, the earbuds are heavy and oversized. Such headphones with noise isolation don’t need batteries. In-Ear-Headphones and Over-the-Ear- Headphones are best in noise isolation.
What is ACTIVE NOISE cancellation
Active noise cancellation is normally called “Noise Cancelling ” headphones. Such headphones cancel most of the noise by noise isolation and also by noise cancellation. In noise cancellation, some fancy processing creates inverse waves which get fed back into the headphones. These inverse waves cancel out the ambient sound. This process is called active noise cancellation or in simple words noise cancellation. Noise cancelling works best with low droning sounds, like car engines, aeroplane engines, air conditioners, etc. But could never reduce baby cries.
What is IP78
IP refers to the International Protection Rating (Ingress Protection Rating). They are used to define levels of sealing effectiveness of electrical enclosures against intrusion from foreign bodies (tools, dirt, etc) and moisture.
First Digit 7 indicate Solid Protection
Second Digit 8 indicate Liquids Protection
IPX5 –X-No protection from dust.5- Protects from water jets in any direction