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What is Headphone?

Sometimes referred to as earphones, headphones are a hardware output device that either plug into your computer line out or your speakers to privately listen to audio without disturbing others. Which also include a microphone and a popular solution for computer gaming.

Headphones (or head-phones in the early days of telephony and radio) are a pair of small listening devices that are designed to be worn on or around the head over a user's ears. They are electroacoustic transducers, which convert an electrical signal to a corresponding sound in the user's ear. Headphones are designed to allow a single user to listen to an audio source privately, in contrast to a loudspeaker, which emits sound into the open air, for anyone nearby to hear. Headphones are also known as ear speakers, earphones or, colloquially, cans.


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History of Headphone:-

Headphones originated from the earpiece, and were the only way to listen to electrical audio signals before amplifiers were developed. The first truly successful set was developed in 1910 by Nathaniel Baldwin, who made them by hand in his kitchen and sold them to the United States Navy.

Some very sensitive headphones, such as those manufactured by Brandes around 1919, were commonly used for early radio work. These early headphones used moving iron drivers, with either single ended or balanced armatures. The requirement for high sensitivity meant that no damping was used, thus the sound quality was crude. These early models lacked padding, and often produced excessive clamping forces on the wearer's head. Their impedance varied; headphones used in telegraph and telephone work had an impedance of 75 ohms. Those used with early wireless radio had to be more sensitive and were made with more turns of finer wire. Impedance of 1000 to 2000 ohms was common, which suited both crystal sets and triode receivers.

In early powered radios, the headphone was part of the vacuum tube's plate circuit and carried dangerous voltages. It was normally connected directly to the positive high voltage battery terminal, and the other battery terminal was securely grounded. The use of bare electrical connections meant that users could be shocked if they touched the bare headphone connections while adjusting an uncomfortable headset.

In 1958, John C. Koss, an audiophile and jazz musician from Milwaukee, produced the first stereo headphones. Previously, headphones were used only by telephone and radio operators, and individuals in similar industries.

The 3.5 mm radio and phone connector, which is the most commonly used in portable application today, has been used at least since the Sony EFM-117J radio which was released in 1964. It became very popular with its application on the Walkman in 1979.


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Side effects of Headphone:-

1. When you use headphones or earphones, the direct audio goes into your ears. Volume exceeding 90 decibels can result in hearing complication and even hear loss. All those who wear earphones and headphones are at higher risk of hearing loss and even complications in hearing. If anyone listens at more than 100 decibels for even 15 minutes, he can face hearing loss.

2. We all once in a while share our earphones and headphones with friends and family. This sharing can easily result in Ear infections. Bacteria from ears of different people can easily travel through your headphones.

3. Recent studies have shown that people who use earphones or headphones most of the time in the day to hear loud music has felt numb ears. Their hearings abilities get numb for a while and then come back to normal. This numbness of hearing can be dangerous and lead to deafness.

4. People using earphones and headphone; usually complain of pain in the ears. Some strange sound buzzing inside or ears or a sharp pain in a certain point of ear.

5. The Electromagnetic waves produced by earphones and headphone can cause serious dangers for your brain. People who are daily users of Bluetooth, headphones and earphones have been found more prone to brain related problems.


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