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Mic Makes Right

Good audio begins with a good microphone

By Ken Kerschbaumer -- Broadcasting & Cable, 7/26/2004

Sidebars:
No Strings Attached

No matter how much money is invested in the console, audio effects or other aspects of audio postproduction, it's the microphone that does the heavy lifting. Picking the right one is critical.

When it comes to finding the right mic, the job dictates the decision. Typically, handhelds work for field reporting; reporters can also attach the mic flags that identify the station or network. Headsets are generally best when a mic must stay in front, no matter which way a user turns. Lavaliers are suitable for newscasts.

Michael Pettersen, director, applications engineering, for microphone manufacturer Shure, states the obvious when he says good sound should be the biggest consideration. But that isn't the only factor. "It's also important that it is rugged and has good shock value," he says. "Interview mics take a beating."

Reporters' handheld mics are brutalized in the field, so sturdiness is a factor. In addition, Pettersen says, a good mic has an internal shock mount to minimize hand noise if, for example, the reporter is nervous. Shure's SM63 mic, he says, has a rubber-like donut on which the microphone floats inside.

Inside the newsroom, lavalier mics continue to be the top choice for newscasts and studio programs; art directors like them, too. They're compact and discreet, but don't expect them to get any smaller. Lavalier-mic technology must remain practical to use.

"We're actually getting into the limitations of the size of the human fingers," Pettersen says. "If it's much smaller, people won't even be able to put it on themselves."

As for headsets, they continue to get more lightweight and comfortable, which is helpful for announcers covering a five-hour golf tournament. And they've come a long way from the early days. "Today, art directors like the way they look, the talent likes them because they're comfortable, and the audio guy likes it because it tracks the mouth," says Pettersen. "Everybody wins."

Simply put, the goal should be a mic that delivers natural speech. Other things to look for include resistance to some wind for outdoor needs and the ability to withstand shock.

Once the type of mic to use is decided, the next choice is the one that sounds the best. Unfortunately, that part of the decision is completely subjective. "Asking someone what kind of mic they should use is like asking an artist what color you should use to paint a sky," says Pettersen. "It depends on what kind of effect you want to get."

 

No Strings Attached

Tripping over wires and cords gets old fast. Wireless mics are one way to cut out the clutter. But buying a new system can be tricky. Here's a guide to figuring out what will work best for you.

First, the basics of how wireless mics work: You speak into an input device, and it takes the sound of your voice, turns it into an electrical signal, and then sends that to the transmitter. The transmitter turns the electrical signal into a radio signal and sends it to the receiver. The receiver then takes the radio signal and converts it back into an audio signal, then feeds it into the sound system.

When it comes to wired vs. wireless, it's the radio signal that makes the difference. Conventional wired microphones send an electronic signal from the transmitter to the receiver, and that signal has to travel through a cord. But, when the transmitter emits a radio signal, wires become obsolete. The advantage to this is obvious: Imagine Britney Spears with a snake and a corded microphone.

There are two types of wireless transmitters. For clip-on mics, a "belt-pack" transmitter can be attached to clothing or worn in a mic belt (about the size of a pack of cigarettes). Handheld mics have the transmitters built into the bottom of the mic. As for receivers, there are single and diversity types. The latter uses two antennas and provides better signal integrity in case of interference.

Once you find a system you like, it's time to put it through its paces and see how it performs. The car-key test determines how well the system can handle high-frequency signals. Set up a wireless system at a relatively high level without feedback and the input gain at a normal level with an average speaking voice. Jingle your keys into the microphone and then, still jingling the keys walk away slowly, about 10 feet. If your car keys still sound like car keys, good. If they sound like crunching potato chips, get a new system.

Or try the "bump test." In a setting with minimal background noise, with the system set at the levels described above, pound (softly) on a table with the outside of your fist. Listen to how much background noise is sent through the system. It should sound like a "bump," not a "whoosh" or a "swish."—Abbie Jean Sparks

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