Monday, March 29, 2010

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Sunday, March 28, 2010

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How Does a Microphone Work?

Microphone was devised to intensify and amplify small sounds, making them more distinctly audible and comprehensible, thereby facilitating long distance communication. The first microphone was invented and developed to be used as a telephone voice transmitter. The word microphone is taken from two Greek words. They are micro, which means small, and phone, which means communication.

A microphone is a form of a transducer that changes sound from one form to another. It converts sound waves, existing as patterns of air pressure, into electric signals and eventually back to sound waves through speakers. There are several techniques that can be employed in constructing a microphone but the most commonly used technique is the magneto dynamic design.

In a dynamic microphone, sound waves emitted from a source cause movements in a thin metallic diaphragm and an associated coil of wire. A magnetic field is developed around the coil with the help of a magnet and as the coil moves within this field under the effect of the sound waves, it produces an electric current. The amount of current produced depends on the velocity of that motion, so it is velocity sensitive.

The dynamic microphones are of two different types, ribbon microphones and moving coil microphones. A ribbon microphone consists of a metal ribbon which is thin. And it is balanced in a magnetic field. The ribbon is connected electrically to the output of the microphone. The vibration of the ribbon within the magnetic field generates the electrical signal.

The moving coil microphone is something different. Here a small movable coil is placed inside the magnetic field. There is a diaphragm with which the coil is attached. Sounds enter there through a windscreen. And then the diaphragm is moved by the sound waves. With the vibration of the diaphragm, the coil moves and produces a current there through electromagnetic induction.

The other popular type of microphones is the condenser type. Here the diaphragm is mounted close to a rigid back plate and a battery is connected to the plate, thereby creating an electric charge between them. The amount of charge depends upon the voltage of the battery, the respective surface area of the diaphragm and the back plate, and on the distance between them. The distance between them changes in accordance with the movement of the diaphragm in response to the sound.

The sensitivity of a microphone depends on how much electric output is produced by a given sound. Any microphone will produce distortion. If it is overdriven by loud sounds such sustained overdriving can have the effect of causing permanent distortion of the diaphragm. This affects the performance and quality of sound even at ordinary sound levels.

The distortion characteristic of the device is what determines its price, and it depends on the amount of care taken in constructing and mounting the diaphragm.

What you have read is only a very simple explanation of how a microphone works. Though this is not comprehensive information about microphones it will give you some idea about the functioning of them.

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Saturday, March 27, 2010

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Karaoke Microphone Technique

Your Karaoke host may be skilled at setting up the sound system, but there is a limit to what they can do! If you aren't aware of how to handle a microphone correctly (and a lot of Karaoke singers aren't) then you are really going to struggle if you actually care about sounding good.

This article covers basic microphone technique. Following this advice and practicing until it becomes natural to you will give you a great chance of sounding as good as possible next time you are singing at a Karaoke. Once you get the microphone technique right, it's down to your KJ to get the sound system setup correctly and, of course, let's not forget your singing talent!

Microphones

A "Dynamic" microphone will typically be first choice for singers and Karaoke hosts. Generally they are of a sturdy construction, can handle high volume levels and are relatively inexpensive to buy (all essential features for a Karaoke mic!).

Something all singers should be aware of with these kinds of microphones is that they pick up sound better from in front of the microphone than from the rear & sides. Also, the closer the microphone is to the sound source (ie. the mouth) the louder and more dominant the bass tones will be.

Microphone Positioning

Therefore the positioning of the microphone is important when you are singing to ensure the best possible tone is produced by the mic. There are two essential elements to this:-

1) the angle at which the head of the microphone is held

2) the distance between the microphone and your mouth

The head of the microphone should be pointing towards your mouth with the microphone held at a slight downward angle, say around 30 degrees.

The distance between the microphone and your mouth must be adjusted depending on how you are singing at any particular time during a song. Positioning may need to change from phrase to phrase, or even word to word. If you are singing softly, the microphone will need to be brought in closer to your mouth, just as if you are singing loudly the microphone needs to be held further away, moving closer again as the volume subsides.

This may sound rather obvious, but there is a definite technique to it which does take practice to acquire. It can take quite a while until it comes naturally to you. Keep the microphone at the correct angle and experiment with the distance from your mouth as you sing quiet & loud phrases.

Common Mistakes

You will see many karaoke singers holding the microphone too far away or right upto (and sometimes almost in) their mouths. If the mic is too far away then you'll either not be heard or the Karaoke host will need to add so much volume and gain to the microphone to try and hear you that you'll just end up with feedback. If the mic is too close then the bass tones will dominate the sound resulting in an unclear, muffled, deep bass sound. So learning good microphone technique is an important skill if you want to give yourself the best chance of sounding good!

Another common problem when holding a microphone close are 'pops' (the loud and unpleasant popping type sound when 'b's and 'p's are pronounced) and the over-emphasis of sounds such as 'ch' and 'sh', for example. Although this has much to do with singing technique too, to help reduce the effect if you find it happening during your next karaoke performance, try holding the microphone a little further away and angling it a little more to try & reduce the effect.

Sounding Good

So, have fun trying to remember all this next time you're singing on karaoke. It might seem awkward at first thinking about this technique whilst also thinking about your singing and watching the words, but it will come naturally after a while and you will sound much better for it!

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Friday, March 26, 2010

Microphone Technique

Although it sounds strange to you, to hear your own voice over the P.A, in fact it doesn't sound any different to the audience than if you were talking to them in normal conversation.

The trick here is to be Yourself, if you haven't got the skill to project a warm friendly personality at the functions where ice breaking is required then being an entertainer isn't for you. The trick is to find a balance, most people would simply hire the gear - saving around 50% of a D.J's booking fee and throw a NOW Cd on - if human input and personality wasn't important to them. At some functions, if they pay for an entertainer and get a human jukebox who doesn't own a mic and just sits there playing music then they occasionally feel cheated!.

I can't stress the "BE YOURSELF", advice enough, don't put on a radio style zany DJ voice - that will sound false and doesn't fool anybody. If you are lucky enough to have a D.J training you, or are a young person helping an older mentor D.J then DON'T be tempted to become a clone of him or her. Adopt your own mic style (not a false voice), use your own tag lines but don't rely on the same cliche's 20 or 30 times a night - this becomes boring and predictable.

Don't rely on "that was", "This is" introductions all night. At some functions going out with a Radio Mic and creating banter with your audience is a great way to break the ice at the beginning of difficult, non formal functions - and a good way of enouraging them onto the dancefloor early on. You can relax the mic work and the frquency of them - once the dancefloor is filling.

Of course there are always going to be functions where you need more mic work than the last, and other functions where it is going to be little mic use, but the key is to develop a style and strength and confidence in your mic working ability and not to rely on non stop music alone to do the work for you.

Just be yourself, and talk normally into the microphone. The thing to work on is to speak confidentally and clearly and try to pace yourself. Speaking too fast will make what you are saying sound garbled, speaking too slow will make you sound like you are addressing a bunch of village idiots . Pretty soon, with a little time and practice you'll develop your own individual skill and style and that is the most important aspect, don't try to copy anybody else or put on a different voice, it will sound false and make learning and maintaining the technique a lot more difficult.

If being a comedian is not you, then avoid the jokes unless you are good at this sort of thing , forced comedy can sound false and you may find yourself laughing alone, after all the Client has booked a Mobile Disco and not a stand up comedian!. One of the best pieces of advice I was given my the D.J who trained me, was to "Stick at doing what you are good at and have been booked for, and if in any doubt then leave it out".

Spontaneous one liners are another matter, if something amusing happens, then share it - use the mic to get requests, make a fuss over other people celebrating birthdays / anniversaries - people like to have their 30 seconds of glory and hearing their name mentioned, over the mic

My advice to those nervous about public speaking for the first time, is not to be frightened of the mic or avoid using one - its your closest and most useful ally, at all functions. Don't talk all over the track, learn to pace yourself over the outro of the previous track and any intro of the next track - don't gabble - talk clearly into the microphone as if you were talking to a friend. With time you should be able to familiarise yourself with how themore popular tracks end and finish, this way you can talk upto the vocal, similar to how they do on the radio - stopping your banter at the moment the vocal on the next track starts. Don't rush to perfect this or gabble to do so, it all comes with time and practice. Keep it simple to start off with.

Start with the easy stuff first, just introducing tracks, and buffet announcements. Once you've built up a bit of confidence, you'll move on from the 'That was..... this is....' routine. Try and include your audience, invite requests, make them feel welcome. Even if you are having a difficult gig don't take it out on the audience and try and look like you are enjoying yourself, even if it's not going to plan. Don't worry about making mistakes on the Mic, we all do from time to time, but don't draw attention to it, or dwell on it it'll just make it worse - besides making mistakes shows that you are human and not a pre-programmed jukebox

Keep key information on the gig, such as the Bride & Grooms' names, Best Man Name etc on a piece of paper on the mixer, so that you can casually glance down if you have a sudden memory blank, but don't write your links down as a speech, otherwise it will sound like you are reading from a script and less natural.

Remember that once the dancefloor is full, you can ease off the mic a little, but keep doing the requests and don't forget that it exists. Learn to find the balance, too much talking can bore the pants of your audience, too little mic work can make people think that you aren't earning your keep!. There are functions where you have a full Dancefloor and it would be obtrusive to chat all over the music when people want to dance, equally there are more formal functions where there isn't the room or inclination to dance, and so a bit of light hearted banter to break the ice and the empathsis on the entertainment side of being a DJ is required rather than just continuous music

All of this will take some time, don't expect to develop a mic technique overnight just take it one gig at a time.

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Thursday, March 25, 2010

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Wednesday, March 24, 2010

How a Microphone Works

Microphones are transducers, devices that change information from one form to another. They detect sound information as air pressure patterns, which they interpret and "translate" into electric current patterns. The accuracy of this transformation provides a better or worse sound. Magneto dynamic microphones have a thin metallic surface (like a diaphragm) and a coiled metal wire attached to it. When the coil is in motion, due to the magnetic field surrounding the coil, current flow is facilitated. The amount of current is determined by the frequency and speed of the motion of the diaphragm, caused by the incoming air patterns. These groups of microphones are known as velocity sensitive devices. Here are some of the most important characteristics involved in making the microphone work:

The microphone sensitivity

This measures the amount of electrical output that is produced by a particular sound. Low and short sounds cannot be recorded unless the sensitivity levels are high enough to capture them. Quiet sounds and musical instruments require higher sensitivity microphones. Otherwise you have to increase microphone gain levels and the sound receives a certain amount of distorting noise.

Microphone overload

When loud sounds overdrive a microphone, a sound distortion will be noticed. With dynamic microphones, the magnetic field loses contact with the coil and the diaphragm may be permanently damaged if loud sounds are consistently recorded. If the microphone is placed to close to a musical instrument, for example, overload is likely to happen

Distortion characteristics

The amount of noise distortion varies from one microphone to another, even when they are the exact same model produced by the same manufacturer. The level of distortion depends on the precision of the alignment and arrangement of the diaphragm. Although a completely linear diaphragm is unlikely to be found, the best thing is to choose a low distortion and, if possible, one that complements the sound and style of your recordings.

Frequency response

Flat frequency responses are the most accurate and produce the best sound quality. Modern microphones offer very high quality levels for front emitted noises.

Microphone noise

The electrical currents produced by the microphone are very low, since they need to be sensitive enough to capture all the sound fluctuations. In order to make this weak electrical impulse readable by any electronic equipment (such as recording devices) it has to be amplified. This means that the noise emitted by the electrical current will also get amplified. While this was a problem with older microphones, modern ones are essentially noise free.

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Misuse of Shotgun Microphones

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Glitter (Gold) Microphone

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Tuesday, March 23, 2010

Choosing A Microphone For Podcasting

If you're reading this article then I don't suppose I have to tell you that in recent years there has been a massive rise in the number of voice-overs for internet purposes such as Podcasts, You-tube etc and the quality of these is often poor. This is pretty unforgivable nowadays, given the low cost of good quality microphones and improvements in sound card technology.

Microphone Choice

To get a good voice recording you don't need to spend a fortune on a microphone for this type of work. You can use any type i.e. Dynamic, Ribbon, Condenser or Electret since the frequency range of the human voice is not that great and normally you'll be positioning the microphone fairly close to the person doing the commentary, so microphone sensitivity is not an issue.

Acoustic Considerations

By getting the microphone close to the commentator you reduce the effect of room acoustics and any background noise such as computer fans.

It's best to use a cardioid pattern microphone to help reject such noises. Place the microphone about six inches from the commentator's mouth, this is more important for dynamic vocal microphones such as the Shure SM58 which is designed for very close up work. If it's too far away its lack of sensitivity and tailored frequency response will give a thin sound and require more gain at the mixer which means more electronic noise/hiss.

If acoustic noise is still a problem then consider hanging duvets in front of and behind the commentator (or even all around) to help soak up the noise.

Windshield considerations

Microphones may have an integral windshield but they're often not capable of completely eliminating wind noise, so it's advisable to invest in a separate windshield to mount between the commentator and the microphone. The commentator can go right up to the windshield and the microphone can be a few inches behind it (particularly the dynamic vocal type).

The reason for getting a windshield is because the spoken word is more prone to wind blasts than when singing and the spoken word is more exposed than a lead vocal in a music track. By placing the microphone above the commentator (looking down at the mouth) you can get rid of wind noise but often they will raise their head to talk into the microphone naturally (even when you say otherwise) and cause you problems, so it's probably easier to just get a windshield.

Voice recording as a job

If you're really serious about doing lots of voice-over recordings (on a commercial basis) then you'll need to invest in sound-proofing your recording room and the voice-over room and you'll need to spend money on getting a natural sounding acoustic i.e. fairly dry and not boxy sounding (this often occurs when you have a small room).

You'll need a script stand, so it's best to keep the microphone out of the voice-over's eye line. Therefore the best microphone type will be a Condenser with a cardioid pattern selected (hanging above the artiste's head) in order to get the best sensitivity (i.e. less noise/hiss) when you place the microphone further away from the voice-over artiste.
If the microphone is below the artiste (looking up at the mouth) then you will get a different 'nasal' tone.

If a cardioid or figure of eight microphone is used very close to the mouth you will get a 'proximity' effect i.e. a more bassy sound.

Experiment with different microphones and placement to get the sound you are looking for.

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MAKE Volume 14

Keep an eye-out for Make Vol. 14, which has a special section on optics. You'll learn how to make an inexpensive but powerful digital microscope that will allow you to display bacteria colonies on a video monitor, a vintage-looking opaque projector that can display artwork from books onto a wall, a model of a crazy-angled room that makes things appear to change size, and a cool kaleidoscope. Also in the issue, we'll show you how to build the following: a mesmerizing taffy pulling machine, a remote control dune buggy with a built in video camera, a dollar-store parabolic microphone, and many more fun and fascinating projects.

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Monday, March 22, 2010

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Thursday, March 18, 2010

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Wednesday, March 17, 2010

Earthy Beginnings Microphone, 4 Years

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Tuesday, March 16, 2010

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Monday, March 15, 2010

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Sunday, March 14, 2010

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Saturday, March 13, 2010

Glitter Microphone

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Friday, March 12, 2010

Things to Look for When Buying a Computer Microphone

Computer microphones are a valuable addition to any PC and they greatly increase interactivity and communication levels. You can use a microphone for performing various tasks, both business and fun related. For example, you can hold a conference with your business partners, over the Internet, or you can chat with your friends online, instead of doing that on the phone. Of course, in order to enjoy accurate and high quality communication, you have to choose a good PC microphone. There is a huge variety of models on the market, ranging from microphones that you can buy for a few dollars and going all the way to expensive, high tech desktop microphones. So which PC microphone is right for you?

Price Vs Quality

You can pay $5 for a microphone, or you can pay $50. So where's the difference, apart from the price? Well, cheap microphones have low prices for some good reasons: they offer average to low quality sound, they break down more easily and you can't use them successfully in all applications that support a microphone. The materials they are manufactured from have to be cheap, which eliminates the idea of high quality, so the end product is of lower reliability. And at this price, you can be sure bulk manufacturing is present and quality tests are quick and far from rigorous. Microphones that come for a higher price have, in most cases, better sound quality and more features. Such microphones will have noise canceling filters, which help diminish background noise. Distortion filters and integrated circuits also help keep voice sounds clear and accurate. The materials used for more expensive microphones also last longer - plastic doesn't crack so easily and if you drop it on the floor you know that the internal components are well protected.

Choosing the right computer microphone

Determining what price range you are in and what model to purchase depends heavily on the purpose you have in mind for the microphone. Are you going to use it just to chat with friends online? In that case, spending a lot of money on a professional computer microphone is not justified. Do you plan to hold business conferences over the Internet? Then maybe you should get a better microphone that will allow the discussion to be continuous and clear, without noise distortion. Giving vocal commands to your computer or dictating to word processing software with speech recognition capabilities is another use for desktop microphones. Quality should be first here - speech recognition software is very sensitive and demands a high quality microphone and sound card. Recording your voice and inserting it into music tracks is possible, but a high quality microphone is absolutely essential in this case.

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Thursday, March 11, 2010

Wireless Microphone System and Multimedia

Description of Wireless Microphones
A computer wireless microphone is a microphone with no tangible cable and is directly connected to the sound recording (sound card) of a computer. Its hands-free feature allows for multitasking.

The wireless microphone technology is now being incorporated in technologies like the mouse, speaker, printer, scanner, and digital cameras. Audio applications include speech recognition, speech dictation, computer telephony, video conferencing, and internet telephones.

The sound card is typically included as package on personal computers and is attached to the motherboard of the PC. It is usually coupled with built-in microphone and line level ports that work in the analog audio signal input and output of the audio data.

One advantage of the wireless microphone system is being able to customize a loud speaker for various modes like speakerphone mode or non-speaker audio mode. These microphones are often joined to the head set and permit you to have the benefit of better quality of music and sounds. The head set microphones also let you move freely in all directions without the risks of possible stumbles or trips.

Nowadays, there are different standards, frequencies, and transmissions of modern devices being used to replace the conventional microphone's cable connection and turn it into wireless. Wireless microphone can be transmitted in radio waves using UHF or VHF frequencies, AM or FM frequencies or any other digital software scheme. Low cost microphone models make use of an infrared light. To avoid interference, most advanced variations of this device operate selected frequency to facilitate the adoption of several computer programs simultaneously.

The Modern models of computer wireless microphone transmit clear reception. The two separate receiver modules with antennae reduce dead spot in sound waves.

Two Types of Most Frequently Used Digital Transmission Scheme
The Digital Hybrid System uses an FM analog audio signal to combine with Digital Signal Processing (DSP). It enhances the audio spectrum to make it easier to get the right frequency. DSP reduces noise and eliminates undesirable effects. This wireless microphone operates on a high level bandwidth of 200 to 500 kHz.

On the other hand, the Pure Digital System is a frequency-hopping spread technology. It requires more bandwidth than an FM signal and operates at 900 MHz or 2.4 GHz bandwidth.

Where to Use the Computer Wireless Microphone System
Computer Wireless Microphone System is substantially versatile. It can be applied in vehicles associated with cellular phones, transportable video cameras, and other multimedia device. In addition, these device systems can be use in concert halls, live stages, radio stations, or wayside recording. These wireless microphones can function well in other two-way communication devices such as aircraft headsets.

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Wednesday, March 10, 2010

Weekend Project: Parabolic Microphone

Here's a an easy to make, dollar store DIY spy microphone that lets you listen from afar and bring the sounds up close. Credit for the original project goes to Jim Lee. From Make Magazine Volume 14.

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