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20.02.2014 admin
A microphone is a device which takes varying pressure waves and converts them into varying electrical signals.
There are several technologies dealing with how a microphone makes this conversion from air waves to electric signals. Let’s see the basic types of modern microphones.Dynamic microphonesA dynamic microphone uses the electromagnetic technology. The audio signal is generated when a conductor moves within the magnetic field (a lightweight diaphragm moves according to the sound pressure causing a magnet or a coil of wires to move). In response to its movement, the electromagnet generates an electric signal which flows into the wire. Because of this technology, dynamic microphones are a bit less sensitive to high frequencies and pressure levels compared to other types such as condenser microphones described below.
They are not too competitive for voice recording but are very good for other purposes such as electric guitars or bass drums. Dynamic mics are the best when the sound source is close and loud enough.Condenser microphonesThis type is very popular nowadays.

The condenser microphone is basically a capacitor where one plate is moving according to the sound waves’ intensity. When the capacitor is provided with electric power (from a battery or other source), the diaphragm vibrates according to the air pressure.
They are utilized in cell phones, hands-free devices, personal computers, laptops, etc… The operating principle is similar to condenser microphones, with the difference they don’t use an external charge source – it is replaced with an electret. An electret is a permanently polarized component used as a power supply for the microphone.Ribbon microphonesThey are bi-directional microphones. The working principle of a ribbon mic is based on a duraluminium or aluminum-made ribbon suspended in a magnetic field. Nowadays, they are mainly used for exterior recording.USB microphonesThe USB microphone is a recent advancement in the microphone technology.
With these two elements, the microphone no longer needs to be connected to an external power supply and it can be plugged directly into the computer’s USD port. The sound fidelity is good enough for quick recordings.Crystal MicrophonesAs we know, when changing their shapes, crystals also change their electrical features.

When a diaphragm is attached to a crystal, it will create an electrical signal once a sound hits the diaphragm.
This is a relatively new technology but with good premises for the sound recording industry.A post by Kidal Delonix (1515 Posts)Kidal Delonix is author at LeraBlog. Chief editor and author at LERAblog, writing useful articles and HOW TOs on various topics. Particularly interested in topics such as Internet, advertising, SEO, web development and business.Do you like this post?

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