Headphones are a pair of small loudspeakers, or less commonly a single speaker, with a way of holding them close to a user’s 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, colloquially 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 messenger telephone.
Types of headphones:
There are many different types of headphone designs, with the listening situation and the needs of the listener determining what type of headphone will be used.
Earcup headphones
Earcup headphonesEarcup or on-ear headphones rest on the exterior of the ear and were the earliest headphone form designed. The housing, or earcup, of an earcup headphone will be either open or closed. Open headphones, sometimes marketed as “open air” headphones, have an open grille on the back of the earcup, exposing the driver to the outside and allowing sound waves to propagate away from the ear freely. This backing type does not isolate the listener from outside sounds; in addition, sound through open headphones can be heard by others in the vicinity of the user. They usually have less distortion due to the lack of earcup resonance. Closed headphones have a sealed backing, which attenuates sound waves propagating away from the ear. As a result, listeners away from the headphones cannot hear the produced sound easily. In addition, sound from outside is attenuated by the sealed backing, providing a level of isolation to the listener. A sealed chamber is often claimed to have the negative effect of distorting sound in certain frequencies due to resonances within the earcup housing, however, bass frequencies are stronger in a sealed chamber headphone design.
In-ear headphones/Earbuds
Earbuds / earphones Earbuds or earphones are headphones of a smaller size that are placed directly outside of the ear canal, but without fully enveloping it. They are generally inexpensive and are favored for their portability and convenience. However, due to their inability to provide isolation, they are not capable of delivering the same dynamic range offered by many full-sized headphones and canalphones for a given volume level. As a result, they are often used at higher volumes in order to drown out noise from the user’s surroundings, which increases the risk of hearing-loss. During the 1990s and 2000s, earbuds became a common type bundled with personal music devices.
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Headset (telephone/computer)
High Quality Sound Technology. High Definition and Dynamic Sound with Micro-HD Driver Unit.
Typical example of a headset used for voice chats. A headset is a headphone combined with a microphone. Headsets provide the equivalent functionality of a telephone handset with hands-free operation. Headsets typically have only one speaker like a telephone, but also come with speakers for both ears. They have many uses including in Call centres and other telephone-intensive jobs and for personal use at the computer to facilitate comfortable simultaneous conversation and typing.
Headsets can come in single-earpiece and double-earpiece designs. Single-earpiece headsets are known as monaural headsets. However, double-earpiece headsets come in both stereo type (two channels of audio signal, one for each earpiece) or binaural type (the same audio channel for both ear-pieces).
The microphone arm of headsets comes in external microphone type and voicetube type. External microphone designs have the microphone housed in the front end of the microphone arm, inside a microphone capsule. Voicetube designs are also called internal microphone design, and have the microphone housed near ear-piece. The sound travels through the tube to the hidden microphone.
Telephone headsets
The Phonapart Telephone recorder (Auomatic 2 WAY )simply plugs into any phone line.
Telephone headsets connect to a fixed-line telephone system. A telephone headset functions by replacing the handset of a telephone. All telephone headsets come in a standard 4P4C commonly called an RJ-9 connector.
For older models of telephones, the headset microphone impedance is different from that of the original handset, requiring a telephone amplifier to pair with the telephone headset. A telephone amplifier provides basic pin-alignment similar to a telephone headset adaptor, but it also offers sound amplification for the microphone as well as the loudspeakers. Most models of telephone amplifiers offer volume control for loudspeaker as well as microphone, mute function and headset/handset switching. Telephone amplifiers are powered through batteries or AC adaptors.
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