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A microphone, sometimes referred to as a mic or mike ( ), is an acoustic-to-electric transducer or sensor that converts sound into an electrical signal. 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.

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Wikipedia about microphone

A microphone, sometimes referred to as a mic or mike ( ), is an acoustic-to-electric transducer or sensor that converts sound into an electrical signal. 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.

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Condenser, capacitor or electrostatic microphones

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In a condenser microphone, also known as a capacitor microphone, the diaphragm acts as one plate of a capacitor, and the vibrations produce changes in the distance between the plates. There are two methods of extracting an audio output from the transducer thus formed: DC-biased and RF (or HF) condenser microphones. With a DC-biased microphone, the plates are biased with a fixed charge (Q). The voltage maintained across the capacitor plates changes with the vibrations in the air, according to the capacitance equation (Q = C \ V), where Q = charge in coulombs, C = capacitance in farads and V = potential difference in volts. The capacitance of the plates is inversely proportional to the distance between them for a parallel-plate capacitor. (See capacitance for details.)

A nearly constant charge is maintained on the capacitor. As the capacitance changes, the charge across the capacitor does change very slightly, but at audible frequencies it is sensibly constant. The capacitance of the capsule and the value of the bias resistor form a filter which is highpass for the audio signal, and lowpass for the bias voltage. Note that the time constant of a RC circuit equals the product of the resistance and capacitance. Within the time-frame of the capacitance change (on the order of 100 μs), the charge thus appears practically constant and the voltage across the capacitor changes instantaneously to reflect the change in capacitance. The voltage across the capacitor varies above and below the bias voltage. The voltage difference between the bias and the capacitor is seen across the series resistor. The voltage across the resistor is amplified for performance or recording.

RF condenser microphones use a comparatively low RF voltage, generated by a low-noise oscillator. The oscillator may either be frequency modulated by the capacitance changes produced by the sound waves moving the capsule diaphragm, or the capsule may be part of a resonant circuit that modulates the amplitude of the fixed-frequency oscillator signal. Demodulation yields a low-noise audio frequency signal with a very low source impedance. This technique permits the use of a diaphragm with looser tension, which may be used to achieve better low-frequency response. The RF biasing process results in a lower electrical impedance capsule, a useful byproduct of which is that RF condenser microphones can be operated in damp weather conditions which would effectively short out a DC-biased microphone. The Sennheiser "MKH" series of microphones use the RF biasing technique.

Search results for Microphone

The Museum of Russian microphones: ribbon, valve, solid-state.

Russian vintage microphones: ribbon, valve, solid-state. LOMO, Oktava, RTT, Nevaton ... Welcome to Russian Microphone Muzeum! ...microphones.ru/index.htm

Studio Microphone: Buying Guide

Understanding microphone diaphragm sizes ... What's a USB Microphone? ... Dynamic Microphone ...www.sweetwater.com/shop/studio/studio-microphones/buying-gui...

Microphones Products - zZounds.com

Buy Microphones products and other great brand-name products at zZounds.com. More for your music at zZounds.www.zzounds.com/cat--Microphones--2821

Wireless microphone - Wikipedia, the free encyclopedia

Each of the principal players/singers had their own microphone/transmitter. ... Modern wireless microphone technology, which for the first time offered ...en.wikipedia.org/wiki/Wireless_microphone

Table of Contents

Microphones used in broadcasting and music recording ... AKG Model C 414 B-ULS Multi-Directional Condenser Microphone ... 639B Dynamic and Ribbon Microphone ...www.coutant.org/contents.html

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News about Microphone

Dakich to host radio talk show

The Times of Northwest IndianaINDIANAPOLIS | Former IU interim basketball coach Dan Dakich, an Andrean grad, is going behind the radio microphone.http://www.nwitimes.com/articles/2008/09/16//updates/breakin...

Built-in mic for iPods

The Courier MailWHEN is an iPhone not an iPhone? When it's an iPod Touch that has microphone capabilities and the option of using it as an internet phone.http://couriermail.news.com.au/story/0,20797,24355122-8362,0...

Slam poetry, rowdy and growing

City Pages The poet takes the stage with a roll- ing swagger and flashes a grin to a friend in the front row. He's got the brazen look of a boxer entering the ring, and he cracks his neck before grabbing the microphone to speak. But what comes out of his mouth isn't a poem drenched in testosterone; it's not...http://www.citypages.com/2008-09-17/news/slam-poetry-rowdy-a...

Winter Gloves

MuchMusic.comWinter Gloves began as one guy's way of figuring out how to plug himself into life in the big city. It was a single microphone and minimal equipment gathered into Charles F's downtown Montreal apartment to piece together all the distances he'd covered up until then.http://www.muchmusic.com/music/artists/index.asp?artist=2180

Sony HCB-108 Bluetooth Car Speaker Has Longest Standby, Talk Times [Sony]

GizmodoYeah, I know: Bluetooth car speaker/microphone systems blah blah... but this one's got a such a battery lifespan it's a bit different. Clipped to your car's sun visor (or on your desk as a...http://gizmodo.com/5050397/sony-hcb+108-bluetooth-car-speake...

News about Microphone

NutriSystem, Inc. to Report Third Quarter 2008 Financial Results on ...

MSN MoneyCentralPlease click on Investor Relations at the bottom of the home page and then click on the microphone icon on the Investor Relations home page. About NutriSystem, Inc. Founded in 1972, NutriSystem NTRI is a leading provider of ... http://news.moneycentral.msn.com/provider/providerarticle.as...

Law experts: Fla. conviction possible without body

International Herald TribuneDuring the grand jury proceedings on Tuesday, a microphone was inadvertently left open, broadcasting a feed that television trucks were able to pick up. Chief Circuit Court Judge Belvin Perry warned that anyone who relayed the information could be ... http://www.iht.com/articles/ap/2008/10/15/america/Missing-Fl...

Adobe patches Flash clickjacking and clipboard-poisoning bugs

ComputerworldThis update helps prevent a clickjacking attack on a Flash Player user's camera and microphone," the advisory said. Last week, Adobe warned users that attackers could use recently reported clickjacking tactics to trick them into giving a malicious ... http://www.computerworld.com/action/article.do?command=viewA...

Lip service - the next karaoke craze

StuffGood singing fills up a gauge that eventually allows players to earn bonus points for crowd-pleasing gestures, such as simple taps or swinging the microphone over your head. Anyone can pick up a microphone, give it a jiggle, and then instantly join in ... http://www.stuff.co.nz/4729245a28.html

RSS Feed: Local News

Tracy PressPeyton Davis takes her turn at the microphone to try and spell the word correctly. Glenn Moore/Tracy Presshttp://tracypress.com/content/view/16105/2268/

Search results for Microphone

Amazon.com: microphone

A community about microphone. Tag and discover new products. Share your images and discuss your questions with microphone experts.http://www.amazon.com/tag/microphone

Adobe - Flash Player : Help - Microphone settings

What are microphone settings? What happens if I do nothing? What can I change here? What if Flash Player doesn't find a microphone? How do I test my speakers? How can ... http://www.macromedia.com/support/documentation/en/flashplay...

Microphone Reviews

Microphone Reviews at MicrophoneReviews.com ... High End Quality from a Midrange Microphone Awesome Condenser Microphone Stylish, Sensitive Studio-to-Stage Microphone ... http://www.microphonereviews.com/

Microphone Data

Microphone Data Book - the definitive guide to microphones. ... Home. Microphone Data is the successor to the original Microphone Data Bookhttp://www.microphone-data.com/

Microphone Exchange

general site description. ... Forgot your password? Click here to retrieve your login informationhttp://microphoneexchange.com/
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Videos found for Microphone

DMX Cable Vs Microphone Cable - Wha...

DMX Cable Vs Microphone Cable - What's The Difference?In this video, I try to explain some of the basic differences between DMX and standard Microphone or Audio cable. I don't explain ALL of the differences, but I try to give some...Flash - Video

Mr. Microphone

Mr. MicrophoneHey good looking, we'll be back to pick you up later!Flash - Video

Laser Espionage Microphone (how-to)

Laser Espionage Microphone (how-to)Listen inside of a building hundreds of yards away using a laser. Please rate, comment, and digg!! Ranked 4.18 / 5 | 10,936 views | 16 comments Click here to watch the video...Flash - Video

German Priest Accidentally Blesses ...

German Priest Accidentally Blesses People with MicrophoneThat's one holy microphoneFlash - Video

Behind The Microphone

Behind The MicrophoneLarry King's producers take you behind the scenes. Find out what happened when we took our cameras to a polygamist ranch.Windows Media - Video

Videos found for Microphone

Labtec Pc microphone User Review 18...

Labtec Pc microphone User Review 1857skype certified microphone by labtec, small, easy to use, good quility. Videopinions are product reviews and demonstrations by the people who use them - in full motion video. Go to Expo TV at www.exp...flash: 0 MB w:400px - h:300px

microphone_kazoo.wmv

microphone_kazoo.wmvBaby Keyboard (July 2005) 6) Baby Scootie Bootie (July 2005) 7) Microphone/Kazoo Practice (July 2005) 8) Pop (July 2005) 9)msmedia: 4.5 MB w:320px - h:240px

Logitech Noise-Canceling PC Headset...

Logitech Noise-Canceling PC Headset with Microphone User Review...Review of a Logitech Headset Videopinions are product reviews and demonstrations by the people who use them - in full motion video. Go to Expo TV at www.expotv.com to find more video product reviews ...flash: 0 MB w:400px - h:300px

Using Microphone.wmv

Using Microphone.wmv* Setting up your Microphonemsmedia: 0.9 MB w:640px - h:480px

Microphone.MPG

Microphone.MPGmicrophone array system. In this demo, the audience general shot is disabled. What the system tries to do here is to locate me and put me in the center of a shot, then broadcast that shot. How accurat...mpeg: 6.7 MB w:176px - h:112px

Answers for Microphone

Matt

What is a good yet cheap microphone amplifier brand, and where should I get it from?

Matt
KitKatQueen_96

How do I get my microphone to work on my dell laptop?

KitKatQueen_96
The Computer Guy

How to operate hand radios and microphone sets?

The Computer GuyThey should teach you how to use the radio. They may have different frequencies for different things or other things like that. A radio is easy to use. Turn it on, check to make sure it's on the ri...
extremelyradicalman

What is the best remote podcast recorder and microphone?

extremelyradicalmanThe Edirol R-09 is a nice one. The M-Audio MicroTrack II and Zoom H2 are also nice ones. They all have their pros and cons so it's best to compare them based on what's important to you: size of mics, ...
percussiondavid

What kind of microphone should I use with a portable mini-disc player?

percussiondavidYou are limited by the player itself on what mics you can use because of the tiny mic connectors most small recorders have. If the recorder has a standard 3.5mm mic connector (like a headphone jack) ...

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