Hello guys and welcome back, today we're going to discuss the Active Noise Cancellation technology which is used in high-end headphones and earphones. In fact, the same technology is also used in smartphones because of this technology we're able to hear the crystal clear voice of the person during calls and enjoy our favorite music even in a crowded place. Many people are often get baffled whenever the term noise cancellation comes up. This particular term 'Noise Cancellation' embodies some different ideas/technologies to eliminate unwanted noise thus making your listening experience much smoother. Many people are often get baffled whenever the term noise cancellation comes up.
Today we're going to look at what active noise cancellation means? and exactly how active noise cancellation works?
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WHAT IS ACTIVE NOISE CANCELLATION?
In simple words, active noise cancellation is a technology that eliminates a particular amount of unwanted background sound. This particular noise-canceling technology, it doesn't cancel out the surrounding noise by simply blocking it. Instead, it produces an anti-noise wave of its own to neutralize the unwanted noise by using a microphone on the headset.
HOW DOES ANC TECHNOLOGY WORK?
As its name suggests this technology is designed to reduce unwanted background noise so effectively that you can have a great listening experience even in noisy environments like while walking in the busy street or traveling into the train or even in an airplane.
TYPES OF ANC TECHNOLOGY
Three types of ANC techniques are widely used for noise suppression:
1) Feed-Forward ANC
2) Feedback ANC
3) Hybrid ANC
Feed-forward ANC
In a feedforward setup, the microphone is placed outside the ear cup. The mic hears the noise before the person.
The mic monitors external noise, the Active Noise Cancellation circuit inverts it into “anti-noise,” then mixes it with audio playback to create a noise cancellation.
As the mic picks up the noise early on, it has more time to respond and generate the anti-noise. And it is good for high-frequency noise reduction.
But, during the generation of the anti-noise signal, the path traveled by the actual noise signal also needs to be considered. If the actual noise is coming from some weird angle then the path traveled by the noise will be slightly different and it will reach the user's eardrum a little delayed.
And anti-noise will not be able to cancel it completely. In some cases, if the path difference is more than that instead of canceling it, it will actually amplify the noise.
Feedback ANC
In this technique, as the mic is fitted inside the ear cup and in front of the speaker, it gets to hear the resulting signal in exactly the same way the user does. And because of that, it can adopt the variation in the noise easily.
Because the round-trip time, which includes monitoring, comparing, and creating anti-noise, is longer than that for feed-forward anti-noise, feedback type ANC is only effective for canceling low-frequency noise.
Hybrid ANC
It combines both feed-forward and feedback systems. And in this technique, the microphones are placed insides as well as outside the ear cup. And the user should receive the best noise cancellation. Also using this method, the frequency range for the noise cancellation can be enhanced. The Hybrid ANC headphones are the most expensive among the different types of ANC.
Active Noise Cancellation vs. Passive Noise Cancellation
The main difference between active noise cancellation and passive noise cancellation is that active noise cancellation technology it's trying to eliminate unwanted background noise, whereas passive noise cancellation technology it's trying to just block the ambient noise.
Active noise cancellation does this with the help of an extra microphone placed on the ear cup and electronic circuitry while on the other hand in passive noise cancellation it's trying to block out the ambient noise by the design and the fitting of the headphone.
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CONCLUSION
So this is all about what is active noise cancellation? and how do ANC headphones works? If you like what you just read then share it with your family and friends. Also if you have any questions regarding this then let me know in the comment section down below. See you next time with another interesting article till then bye.
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