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Headphones (or head-phones within the youth of telephony and radio) traditionally ask a pair of small loudspeaker drivers worn on or round the head over a user’s ears. they’re electroacoustic transducers, which convert an electrical signal to a corresponding sound. Headphones let one user hear an audio source privately, in contrast to a loudspeaker, which emits sound into the outdoors for anyone nearby to listen to . Headphones also are referred to as earspeakers, earphones or, colloquially, cans. Circumaural (‘around the ear’) and supra-aural (‘over the ear’) headphones use a band over the highest of the top to carry the speakers in situ . Another type, referred to as earbuds or earpieces contains individual units that plug into the user’s auditory meatus . a 3rd type are bone conduction headphones, which usually wrap round the back of the top and rest ahead of the auditory meatus , leaving the auditory meatus open. within the context of telecommunication, a headset may be a combination of headphone and microphone.
Headphones hook up with a sign source like an amplifier , radio, CD player, portable media player, mobile , computer game console, or electronic instrument , either directly employing a cord, or using wireless technology like Bluetooth, DECT or FM radio. the primary headphones were developed within the late 19th century to be used by telephone operators, to stay their hands free. Initially the audio quality was mediocre and a breakthrough was the invention of hi-fi headphones.
Headphones are made during a range of various audio reproduction quality capabilities. Headsets designed for telephone use typically cannot reproduce sound with the hi-fi of pricy units designed for music listening by audiophiles. Headphones that use cables typically have either a 1/4 inch (6.35mm) or 1/8 inch (3.5mm) telephone jack for plugging the headphones into the audio source. Some stereo earbuds are wireless, using Bluetooth connectivity to transmit the audio signal by radio waves from source devices like cellphones and digital players. thanks to the spread of wireless devices in recent years headphones are increasingly employed by people publicly places like sidewalks, grocery stores, and transportation system . Headphones also are employed by people in various professional contexts, like audio engineers mixing sound for live concerts or sound recordings and DJs, who use headphones to cue up subsequent song without the audience hearing, aircraft pilots and call centre employees. The latter two sorts of employees use headphones with an integrated microphone.