What is Noise Cancellation technology?

If you’ve ever been on a long, cross-country flight, you are likely familiar with the loud hum of the jet engine throughout the journey. Luckily, the introduction of noise-cancellation technology has allowed weary travelers to rest their ears and their eyes on long flights. Likewise, daily commuters are able to use noise-cancellation to tune out the noisy chattering of a train-full of people on their way to and from work.

Yet, despite all of the benefits noise-cancellation offers for travel and daily commutes, there are still many misconceptions about noise-cancelling technology. Some mistakenly consider noise-cancellation capable of attaining complete silence, whether aboard a noisy train or walking through a construction site. The truth is that no noise-cancelling headphone, no matter how good the rating, will fully eliminate high pitch and high frequency sounds, like a jackhammer or screaming baby. Good noise-cancellation is intended to minimize ambient noise, or low frequency noises, such as the hum of a jet-engine, the steady pulse of a moving train or the sound of co-workers bustling around you during the work day.

When shopping for a pair of good noise-cancelling headphones, it’s important that you truly understand what noise-cancellation can do well, and on the other hand, what it’s not designed to do. So, let’s talk a little more about how noise-cancellation works.


Headphones contain a miniature microphone that picks up external ambient sounds. By analyzing the background noise, the noise-cancelling circuitry takes note of the frequency and emulates a sound to cancel out the noise. This “destructive interference” allows you to stay focused on the audio you want to hear. This sound reduction technology, however, doesn’t work on all frequencies. While every manufacturer is slightly different, all noise-cancelling headphones operate to reduce low frequency sounds! It’s a case of using fire to fight fire – in this case – using noise to fight noise!


These headphones do not use any electronic sound reduction technology and as a result, do not isolate lower frequency sound. Just like wearing earmuffs or putting your fingers in your ears decreases the ability to hear, the materials of the headphones themselves block out some sound waves and decibels (which is a unit of measurement for sound intensity). Passive noise-cancellation can minimize some high frequency sound, however, it will only be muffled depending on the thickness and composition of the material in the ear-cups.

To sum it all up, noise-cancelling headphones are most successful at reducing low frequency background noises, such as commuter and travel interference. You’ll find yourself needing them on planes, crowded offices or anywhere you just want to lessen the noise around you. With so much ambient noise surrounding us, it’s become difficult to enjoy the music-listening experience when dealing with the environmental fracas of our everyday lives. This is why the need for a pair of noise-cancelling headphones has become essential for the modern audiophile and in 2020, the ability to work from home when the whole family is around.

Number of wireless headset in a given area!!

So as to know the upper most figures of wireless headsets, which can be connected in the office, there are quite a few factors that you would have to consider:

  • Number of headset users for wireless connections that work simultaneously.
  • Design & layout of the office.
  • The kind of technology for wireless headset to be applied (DECT 6.0-1.9Ghz, 900mhz or Bluetooth-2.4Ghz).

DECT 6.0, 900mhz & Bluetooth (2.4ghz) all use entirely diverse working frequencies plus none cause interference to one another.

DECT 6.0 (1.9Ghz) Wireless Headsets CS540, Savi 7210, Savi 7220.  70 is the maximum you should have in the same office or call center.

900Mhz Wireless Headsets: Plantronics CS540-XD, Plantronics CS510-XD, Plantronics CS520-XD, Plantronics CS545-XD , Savi 7310 , Savi 7320. 70 is the maximum you should have in the same office or call center.

Bluetooth Wireless Headsets(2.4Ghz): Poly Voyager 4210 Office, Poly Voyager 4220 Office, Voyager 5200 Office , Poly Voyager 4245 .  70 is the maximum you should have in the same office or call center.

In theory you can have up to 210 wireless headsets without serious problems.  Problems like loss in sound quality, loss in wireless distance, etc.

As an alternative, the new Jabra Engage series wireless headsets  (Engage 65, Engage 75) allows up as many as 120 users using the same headset in the same office.

There happen to be a lot of interconnected things that come into play while influencing wireless headsets numbers deployment in general so to get to a conclusive number is highly difficult.


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How to pick your next Headphones

Here are some steps to consider when selecting one.

1. Determine the specific use of the headphones

The first thing to consider when purchasing a product or service is to determine its purpose. The same applies to a pair of headsets. 

For instance, do you want a pair of headphones you’ll be using while working out in the gym? Or will you use them to listen to music while in bed, at the office, or doing some gardening work? Doing so reduces the scope of your search. 

2. Select your kind of headphone type

There are three main types of headphone sets in the market. There is the in-ear type, on-ear type, or over-ear type.

Each one of them has its good and bad sides, as mentioned earlier in the article.

3. Choose between the open-back or closed-back headphones

Depending on your intended use, taste, or comfort levels, you can choose between the following two versions: 

The closed-back model — This type is designed without any vents or holes on their outer shells. The model is standard among the in-ear, on-ear, and over-ear headsets. 

Open-back model — On the contrary, this kind has holes and vents on their earpieces. This allows sound and air to get in and out of your ears, giving you an illusion of a standard radio or soundstage. 

4. Choose between the wireless and wired headphones

Next, you’ll decide on whether to purchase the traditional wired headphones or their contemporary wireless counterparts. 

Each of them has its own advantages and disadvantages, which leaves you with the option of selecting what works for you. 

For instance, wired headphones will provide you with consistent high-quality audio regardless of the existing conditions besides having a better battery life compared to other wireless types. However, they will require you to carry along your gadget. 

On the other hand,  wireless headphones will allow you to move within a particular radius without your phone or music player allowing you to answer phone calls or listen to music. A  downside would be, they lose function once the battery runs out of charge. Sound clarity and quality can be affected or stop working if you move too far away. 

5. Noise cancellation

Another thing to decide on is whether to have a headset with the noise cancellation feature or not. Nonetheless, this technology enables you to cut off any noise when using a pair of headphones. They can be a good fit for several experts such as transcribers who require a noise-free environment. 

The only caveat here is that they are pricier compared to other types.

What is bluetooth?

Bluetooth is a wireless technology standard used for exchanging data between fixed and mobile devices over short distances using UHF radio waves in the industrial, scientific and medical radio bands, from 2.402 GHz to 2.480 GHz, and building personal area networks. It is a specification (IEEE 802.15.1) for the use of low power radio communications to link phones, computers and other network devices over short distance without wires.

Just like every other wireless technology it requires a transmitter and receiver. The Bluetooth RF transceiver (or physical layer) operates in the unlicensed ISM band centered at 2.4 gigahertz (the same range of frequencies used by microwaves and Wi-Fi). The core system employs a frequency-hopping transceiver to combat interference and fading.

These devices are manager using topology names Star Topology (Piconet). These group of devices creates a network that may contain one master and upto seven active slaves. In this network a physical radio channel is shared among all the devices which are synchronized to a common clock and frequency-hopping pattern.  With master device providing the synchronization details.

Let’s say you want to wirelessly print a picture from your mobile phone to a nearby printer. In this case, you go to the picture on your phone and select print as an option for sending that picture. The phone would begin searching for devices in the area. The printer (the scanning device) would respond to the inquiry and, as a result, would appear on the phone as an available printing device. By responding, the printer is ready to accept the connection. When you select the Bluetooth wireless printer, the printing process kicks off by establishing connections at successively higher layers of the Bluetooth protocol stack that, in this case, control the printing function.

Like any successful technology, all of this complexity goes on without the user being aware of anything more than the task he or she is trying to complete, like connecting devices and talking hands-free or listening to high-quality stereo music on wireless headphones.



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