How do noise cancelling headsets work?
There are several components required to achieve this effect:
A microphone placed inside the ear cup “listens” to external sounds that cannot be blocked passively.
The noise cancelling electronics are fitted discretely in the ear-cup. They sense the input from the m/c and generate a “fingerprint” of the noise, noting the frequency and amplitude of the incoming signal. Then they create a new wave that is 180 degrees out of phase with the waves associated with the noise.
The “anti sound” created in the noise cancelling headsets is fed into the headsetsâ€™ speakers along with the normal audio; the anti-sound erases the noise by destructive interference, but does not affect the transmission of the callerâ€™s or userâ€™s speech.
The term “active” refers to the fact that energy must be added to the system to produce the noise cancelling function. The source of that power is a rechargeable battery.
Using these constituents, noise cancelling headsets are able to provide a reduction in noise of 20 decibels. That means about 70% of ambient noise is effectively suppressed, making noise cancelling headsets ideal for travel, open office environments or other locations with a high level of background noise.
Call us on 0800 652 8052 where our advisors can help you select the most cost-effective noise cancelling headsets for your use.