| The main purpose of Noise cancelling earphones is to | | | | the listening experience and sometimes also damage |
| reduce the undesired ambient or acoustic sounds | | | | the ear drums if they were too sensitive. The new |
| through the ANC or active noise control method. The | | | | models of headphones incorporate battery in their |
| circuitry uses the earphones electronic signal to | | | | existing space but this does not reduce the weight of |
| produce anti-noise signals. This results in a sort of | | | | the headphones. This problem is solved by using |
| destructive interference which results in the cancelling | | | | earphones which support the noise cancelling features. |
| of the ambient noise which is heard in an earphone. | | | | Leading earphone (and other audio devices) |
| These earphones can be very needy for a passenger | | | | manufacturers are now producing earphones which |
| who wants to sleep in noisy vehicles such as subway | | | | have the ANC (active noise control) feature |
| cars or airplanes. It also helps the people who want to | | | | embedded with the help of microphones. These |
| enjoy the music from their iPods or phones without | | | | microphones do not take up any additional space and |
| feeling the need to raise excess volume. | | | | are a part of the circuits main body itself. These |
| The ANC (active noise control) method used by noise | | | | earphones take power from the mp3 players or |
| cancelling earphones cancels the lower-frequency | | | | mobiles they are attached along with and many |
| segment of the noise and higher frequency noises are | | | | companies produce noise cancellation earphones that |
| prevented by the soundproofing techniques. The ANC | | | | are self-powered and do not require any compatible |
| method does not affect the high frequencies much | | | | phones or players to work with. Most manufacturers |
| and soundproofing reduces the need of complicated | | | | offer the user both noise cancellation headphones as |
| circuitry. These work very well when the user is | | | | well as noise cancelling earphones. The headphones |
| alongside a continuously humming refrigerator or the | | | | provide around the ear coverage and can be used for |
| cabin of an airplane but their effectiveness can be | | | | desktop use. The earphones can be used for |
| reduced during quickly changing audio frequencies such | | | | cancelling unwanted noises while traveling. |
| as speeches. Earlier, these noise cancellation qualities | | | | Many earphones come with added noise cancellation |
| used to come in headphones only which would help | | | | switches which can be adjusted according to the |
| airline passengers or helicopter pilots while flying. But | | | | users wish. They do increase the bulk of the earphone |
| these used to involve lots of circuitry which would | | | | but offer the owner a choice to use them only when |
| increase the size and weight of the headphones. | | | | they are desired. Some earphones have a drawback |
| Many headphones consumed power supplied by | | | | against many ANC featured headphones which can |
| batteries which had to be occasionally either | | | | also provide bass support. But, this disadvantage is |
| recharged or replaced. Also, the quality of noise | | | | removed by modern earphones which are more |
| cancellation decreased with the decrease in the | | | | costly but provide quality bass in addition to noise |
| battery life. Earlier models also used to produce | | | | cancellation. |
| additional noises such as hisses which would disrupt | | | | |