A moving coil microphone functions on the basic principle of Electromagnetic induction. It has a copper wire coil, which when moves in the magnetic field a voltage is generated. Then it is induced in the coil in proportion to its amplitude of vibration, which, in turn, depends on the sound pressure. A moving coil microphone contains a diaphragm, which is exposed to sound waves. The diaphragm carries a coil placed in the magnetic field.

Moving coil microphones are cheap and forceful and they are famous for their excellent performance in live presentation and touring. They are especially suited for the close miking of Bass and Guitar speaker cabinets and Drum kits. They are also ideal for live vocals as they have a resonance peak of around 5k hz, providing an inbuilt boost, which on the other hand improves speech, or singing brilliantly.

You will find there are many kinds of moving coil microphones. One of them is the Shure SM58, which is a classic microphone. This is an industry standard microphone designed mainly for live performances. They are strong and yet they do not require high power. However, the drawback of these microphones is that the coil reduces the high frequency response. Therefore, they are not much suitable to be used in the studio applications, where the main focus is on the quality and subtlety. These are of the basic importance, including, high quality vocal recording or acoustic instrument mic voicing. But they are used in some cases in studios for instrument recordings. Moving coil microphone is also the first choice for the snare drums, and also very popular on electric guitar amplifiers.

One of the biggest advantages of a moving coil microphone is the rugged construction of these microphones for rough use. They are also ideal as they have high sound pressure level. It is a strong device and it is impossible to break one without intentionally doing so. They are durable and can withstand pressure of any kind.

Because of these advantages and basic features moving coil microphones are commonly found in road cases of touring set ups. These devices are designed in such a simple design and the production of moving coil microphones are at a great number, therefore, the cost of these microphones is fairly affordable.

Even though these microphones are commonly used for various live performances and they are ideal device for it, yet they do have their disadvantages too. One of the major disadvantages of this microphone is that the coil is relatively heavy and makes it difficult to move quickly. And as a result it makes it difficult to get a high frequency response from these kinds of microphones. Similarly, since the output of the coil is dependent on its velocity, very low frequencies will result in little output as well.

When you look into the above mentioned advantages and disadvantages, you can find the disadvantages are outnumbered by the advantages; then you can say this is mainly the reason for the moving coil microphones becoming a famous device. They are ideal for musical instruments pickups and vocals. And they are also ideal for live sound reinforcement.

About the Author: Victor Epand is an expert consultant for music gear, speakers, and microphones. You can find the best marketplace for music gear, speakers, and microphones at these 3 sites: music gear, music equipment, speakers, and voice recorder, acoustic equipments.
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Microphones are used in many applications such astelephones, tape recorders, hearing aids, motion picture production, live and recordedaudio engineering, in radio and television broadcasting and in computers for recording voice, VoIP, and for non acoustic purposes such as ultrasonic checking.

A microphone is a device made to capture waves in air, water or hard material and translate them into an electrical signal. The most common method is via a thin membrane producing some proportional electrical signal. Most microphones in use today for audio use electromagnetic generation are dynamic microphones, capacitance change condenser microphones or piezoelectric generation to produce the signal from mechanical vibration.

Uses of different kinds of microphones
Condenser microphones span the range from cheap instruments to high quality instruments. They generally produce a high quality audio signal and are now the popular choice in laboratory and studio recording applications. They require a power source, provided generally from microphone inputs from a small battery.

Professional microphones often sport an external power supply for reasons of quality perception. Power is necessary for establishing the capacitor plate voltage, and is also needed for internal amplification of the signal to a useful output level. Condenser microphones are also available with two diaphragms, the signals from which can be electrically connected such as to provide a range of polar patterns such as cardioid and omnidirectional.

Carbon microphone, formerly used in telephone handsets, is a capsule containing carbon granules pressed between two metal plates. The carbon microphone can also be used as a type of amplifier, using a small amount of sound energy to produce a larger amount of electric energy. Carbon microphones were used as early telephone repeaters, making long distance phone calls possible in the era before vacuum tubes.

Crystal microphones used to be commonly supplied with vacuum tube or valve equipment such as domestic tape recorders. Their high output impedance matched well to the high input impedance of the vacuum tube input stage. They were difficult to match to early transistor equipments and were quickly supplemented by dynamic microphones for a short while, and later small eletret condenser devices. The high impedance of the crystal microphone made it very susceptable to handling noise, partly from the microphone itself, but also from handling of the connecting cable.

Shotgun microphones are high directional microphones. They have small lobes of sensitivity to the left, right, and rear but are significantly more sensitive to the front. This results from placing the elements inside a tube with slots cut along the side and wave cancellation eliminates most of the off axis noise. Shotgun microphones are commonly used on TV and film sets, and for field recording of wildlife.

Conclusion
The microphone is a ubiquitous piece of equipment and comes in a number of models. Found in everything from telephones to computers to recording studios, microphones are part of our daily life. It is perhaps the most critical part of the audio chain. A good quality microphone will provide the basis for excellent audio, whereas a poor quality will mean poor quality audio, no matter how good the rest of the system is.

About the Author: Victor Epand is an expert consultant for music gear, speakers, and microphones. You can find the best marketplace for music gear, speakers, and microphones at these 3 sites: music gear, music equipment, speakers, and different microphone models.
Source: http://www.articlesbase.com

All microphones convert sound energy into electrical energy, but there are many different ways of doing the job, using electrostatics, electromagnetism, piezo electric effects or even the change in resistance of carbon granules. Microphones are used in many applications such as telephones, tape recorders, hearing aids, motion picture production, live and recorded audio engineering, in radio and television broadcasting and in computers for recording voice, VoIP, and for non-acoustic purposes such as ultrasonic checking.

When it comes to microphones used in music recording or live performance the vast majority of microphones used are either capacitor or electrostatic or dynamic or electromagnetic models. Both types employ a moving diaphragm to capture the sound, but make use of a different electrical principle for converting the mechanical energy into an electrical signal. The efficiency of this conversion is very important, because the amounts of acoustic energy produced by the voices and the musical instruments are so small.

Dynamic Microphones
Dynamic microphones work via electromagnetic induction. They are robust, relatively inexpensive and resistant to moisture, and for this reason they are widely used on stage by singers. There are two basic types. The moving coil microphone and the ribbon microphone.

Dynamic microphones have the advantages of being relatively inexpensive and hard wearing, and they do not need a power supply or batteries to make them operate. A lightweight diaphragm, usually made of plastic film, is attached to a very small coil of wire suspended in the field of a permanent magnet. When a sound causes the diaphragm to vibrate, the whole assembly works as a miniature electricity generator, and a minute electric current is produced. Because the electrical output is so very small, it has to be amplified using a microphone preamp. Dynamic microphones are most effective when working with relatively loud sound sources that do not contain a lot of very high frequency details.

Capacitor Microphones
Capacitor microphones have been around for several decades, and although modern ones do incorporate a few small technical improvements, the sound character has actually changed very little. Some of the best sounding capacitor ones were designed over 20 years ago. The main part of the capacitor microphone contains a pair of conducting plates, one fixed and the other in the form of a moving diaphragm. When the spacing between the plates changes the capacitance varies, and if a fixed electrical charge is applied to the capacitor, an electrical signal is produced, which faithfully represents the diaphragm vibration.

Capacitors are more expensive than their dynamic counterparts, but they are also much more sensitive, and can capture high frequency detail much more accurately. Furthermore, the capacitor principle, unlike the dynamic principle, lends itself easily to the production of microphones with switchable pickup patterns, although the cheaper models tend to offer just a fixed Cardioid pattern.

Electret Microphones
An electret is a ferroelectric material that has been permanently electrically charged or polarized. An electret microphone is a relatively new type of capacitor microphone invented at Bell laboratories in 1962. A static charge is embedded in an electret by alignment of the static charges in the material, much the way a magnet is made by aligning the magnetic domains in a piece of iron. They are used in many applications, from high quality recording and lavalier use to built in microphones in small sound recording devices and telephones.

About the Author: Victor Epand is an expert consultant for music gear, speakers, and microphones. You can find the best marketplace for music gear, speakers, and microphones at these 3 sites: music gear, music equipment, speakers, and dynamic microphones, capacitor microphones, electret microphones.
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