Shure M367 Especificações descarregar pdf (Página 8)

Double-miking with lavalier microphones is usually achieved with a

special tie clip or bar that holds two microphones. (Note: When wireless

microphones are used, each lavalier mic must be connected to its own body-

pack transmitter. These two transmitters must be on different operating

frequencies, and their signals must be picked up by two different receivers,

as discussed later.)

Surface Mount — These microphones are designed to work on a flat

surface. They are usually physically contoured to look less intrusive on a

conference table or desktop. The microphone element is located very close

to (but not touching) the surface, so that sound waves reflected from the

surface arrive at the mic element at the same time as the direct sound. This

effectively doubles the sensitivity of the microphone compared to a free-

standing handheld type at the same distance. (This sensitivity boost

assumes that the surface is sufficiently large to reflect even low-frequency

sound waves.)

Tips on Using Surface Mount Mics: Surface mount microphones work

best when positioned on a smooth, flat surface, such as a table or desk. If

table vibrations are a problem, try putting a very thin piece of soft foam

rubber underneath the mic. (A computer mouse pad with a hard top surface

often works well.) In some situations, surface mount mics can even work

well when mounted on a wall. Keep in mind that the sound quality of this

type of microphone is affected by the size of the surface on which it is

placed. For best results, use a surface at least 3 feet square; using a smaller

surface will tend to reduce pickup of low frequencies. The effect on speech

frequencies is usually mild, and may actually improve intelligibility of very low

voices by reducing boominess.

Shotgun — The shotgun microphone is so named because the long,

slotted tube in front of the microphone cartridge makes it resemble a

shotgun. This “interference tube” helps reject sounds coming from more

than about 30 degrees off to the sides, while still picking up sounds from the

front. This extremely directional pickup pattern (called a line/gradient

pattern) makes shotgun mics popular for TV news and movie sets.

Shotgun microphones are not telephoto lenses for sound. They do not

allow you to zoom in on a conversation from 100 feet away. Here’s a much

more accurate analogy: imagine looking through a long tube at a person

standing 20 feet away. The person’s image does not appear to be any larger

or closer, but is somewhat easier to see, because the eye is not distracted

by things happening off to either side. This is exactly what shotgun mics do

best - screen out sounds coming from the sides. In practice, a shotgun

microphone can typically be placed at four to five times the acceptable

distance for a standard omnidirectional microphone. Keep in mind that the

shotgun mic will also pick up sounds coming from behind the subject.

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Shure M367 Especificações Página 8