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The iPod Touch is a hand-held touchscreen media player, Wi-Fi Internet device and personal digital assistant (PDA). It is developed, manufactured and marketed by Apple Inc. The iPod Touch launched in September 2007. The second generation became available in September 2008. more »
Years ago I used to work on a popular law enforcement reality show where we followed police as they served and protected us. Although there was a separate sound man and cameraman with a microphone each, and the show advised that it was shot in stereo, the soundtrack rarely delivered it, because stereo is more than having two audio... more »
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From the time they were invented in 1910 by Nathaniel Baldwin, headphones have been a staple of communication across the globe. Of course, as with any technology, they have gone through design changes, new applications have been devised for the them, and they have been manufactured in many different ways.
The very first headphones... more »
MP3 players have become very popular. These mini players compress audio files using less than...
Having evolved from clunky, low-quality headphone substitutes in the 1990s to a sleek and modern way to experience sound, ear buds have become the... more »
When you are listening to music on planes or other crowded, loud places it is often difficult to hear your music over the noise. Regular headsets... more »
A Bluetooth headset is fast becoming a mandatory accessory for any cell phone user. The market for Bluetooth headsets, which are capable of... more »
If you use a headset frequently, it's important to change the ear cushion periodically. Ear cushions absorb a lot of sweat, dirt and makeup and... more »
There are many different kinds of earphones available on the market today. Aside from the choices of brands, earphones can also function in... more »
Headphones are a pair of small loudspeakers, or less commonly a single speaker, with a way of holding them close to a users ears and a means of connecting them to a signal source such as an audio amplifier, radio or CD player. They are also known as earphones, earbuds, stereophones, headsets or, informally cans. In the context of telecommunication, the term headset is used to describe a combination of headphone and microphone used for two-way communication, for example with a telephone.
History
The telephone earpiece such as the one pictured at the right was common around the turn of the 20th century. From the earpiece developed the headphones. Sensitive headphones were the only way to listen to audio signals before amplifiers were developed.
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, either single ended or balanced armature. The requirement for high sensitivity meant no damping was used, thus the sound quality was crude. They also had very poor comfort compared to modern types, usually having no padding and too often having excessive clamping force to the head. 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 1,000 to 2,000 ohms was common, which suited both crystal sets and triode receivers.
In early powered radios, the headphone was part of the vacuum tubes plate circuit and had dangerous voltages on it. It was normally connected directly to the positive high voltage battery terminal, and the other battery terminal was securely earthed. The use of bare electrical connections meant that users could be shocked if they touched the bare headphone connections while adjusting an uncomfortable headset.
Applications
Headphones can be used both read more at » http://en.wikipedia.org/wiki/Headphones
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