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Encyclopedia > Parabolic microphone

A parabolic microphone uses a parabolic reflector to collect and focus sound waves onto a microphone receiver, in much the same way that a parabolic antenna (e.g. satellite dish) does with radio waves. Typical uses of this microphone, which has unusually focused front sensitivity and can pick up sounds from many meters away, include nature recording, eavesdropping, law enforcement, and even espionage.


Parabolic microphones are generally not used for standard recording applications, because they tend to have poor low-frequency response as a side effect of their design. This is a direct result of the physical laws that govern sound waves. Sound entering the parabolic dish from the front axis is reflected into a sphere around the "focus" of the dish, where the microphone element is located. The higher the frequency of the sound, the smaller the size of this sphere. Thus, high frequency sounds tend to be more concentrated onto the pickup element, while low-frequency sounds are "diluted" across a larger volume of space.


See also: Microphone


  Results from FactBites:
 
Parabolic Microphones (292 words)
A parabolic microphone is an ordinary microphone mounted inside a sound-reflecting dish having a parabolic cross section.
Sound waves passing straight into the parabolic reflector are focused by it on the microphone; sounds entering the reflector dish from other angles impinge directly on the microphone, but are not focused on it by the reflector.
In a parabolic microphone system, the microphone is placed at this point; sound waves entering the dish parallel to the axis are focused on the microphone and, thus, amplified.
Parabolic (352 words)
A Parabolic Microphone uses a parabolic reflector (or dish) to collect and focus sound waves onto a microphone receiver, in much the same way that a parabolic antenna (e.g.
Parabolic Microphones are generally not used for standard recording applications, because they tend to have poor low frequency response as a side effect pf their design.
The means and uses of the Parabolic Mics are far and wide, however it is up to the Investigator to put it to the test and use it under a controlled environment (interior).
  More results at FactBites »


 

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