In computing, a headset is a peripheral output device used to listen to audio from an electronic device. Also called hearing aid. In English: headphone.
The headphones clip onto the head or ears and allow users to privately listen to audio. Some headsets have a built-in microphone. The devices that allow the audio to be heard in the general environment are called loudspeakers or loudspeakers.
They are usually connected by USB port, by jack connector or wirelessly.
Most headphones can withstand up to 100 dB (decibels) or in some cases more, which can cause permanent damage to human hearing.
In computers it is considered an output device or peripheral.
headphone history
The first headphones made it possible to listen to electronic audio signals before the existence of amplifiers. The first really successful headset was developed in 1910 by Nathaniel Baldwin (1878-1961), who crafted it in his kitchen and sold it to the US Navy.
The first highly sensitive headphones, like those developed by Brandes in 1919, were generally used in early radio work.
These early headphones used iron conductors. The high sensitivity requirement meant no damping was used, so the sound quality was coarse. They also had no padding, so they often clung annoyingly tightly to their wearer’s head. Its variable impedance; earphones used in telegraph and work phones had an impedance of 75 ohms. Those used in early wireless radios had more sensitivity and were made with more turns of finer wire. Impedances of 1,000 to 2,000 ohms were common.
In early powered radios, the headphones were part of the vacuum tube plate circuit and carried dangerous voltages. They were usually connected directly to the positive high voltage on one battery terminal and the other battery terminal was safely grounded. The use of bare electrical connections meant that the user could be electrocuted if he touched the bare connections of the handset.
In 1943, John C. Koss of Milwaukee produced the first stereo headphone.
Still the most widely used to this day, the 3.5mm radio and telephone jack has been used since at least the Sony EFM-117J radio released in 1964. It became extremely popular with the release of the Walkman in 1979.
Headset Operation
According to the operating principles of the headset, they can be classified into:
– Electrodynamic: these are the most widely used headphones, with good treble reproduction, in addition to being extremely economical.
– Electrostatic: with good frequency response.
– Piezoelectric: they are used for small devices, such as those used by people with hearing disabilities
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