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Posted by Rick Merrill on 09/29/13 11:38
Richard Crowley wrote:
> "Bailey The Dog" wrote ...
>
>>Actually the sound detected by a shotgun along its length is
>>used only for noise canceling, thus rejecting the side noise.
>>This characteristic is exactly what we desire in a parabolic
>>situation as the result is a highly focused sound source with
>>excellent side rejection.
>
>
> Actually ALL the sound is collected along the length of a
> "shotgun" microphone. Many (most?) shotgun microphones
> have no opening at all in the end that points at the source.
> Many have a fake grill there to prevent disorienting users who
> don't understand how line-gradient microphones work.
>
> They work by keeping the sound in-phase which enters along
> the length of the tube, while mixing out-of-phase (thus cancelling)
> sound that arrives from other angles. Of course this is possible
> only down to a few hundred Hz, below that they are designed
> to behave as conventional cardioid (or hyper-cardioid) micro-
> phones. There is an interesting discussion of shotgun micro-
> phones currently running over on news:rec.audio.pro, and they
> are discussed quite regularly over on
> news:rec.arts.movies.production.sound
>
> I started experimenting with parabolic reflectors for light and
> sound as a child and learned early on that the sound/light is
> concentrated at the focal point. If you are making a parabolic
> microphone, you want a small omnidirectional microphone at
> the focal point. Take a look at any modern satellite antenna to
> see how the principles still apply today.
>
> Putting the end of a shotgun microphone at the focal point of a
> parabolic reflector will theoretically yield no sound at all, but in
> the real world, you will hear some sound, but it will be very
> poor quality compared to using an omni at the same point.
>
>
>>Please reference the following article
>>
>>http://www.nrgresearch.com/microphonestutorial.htm
>
>
> Interesting article, but doesn't actually mention how a line-
> gradient ("shotgun") microphone works.
>
>
Awesome! Thanks to all for the explanation(s). Can a shotgun mic
pick up 'useful' stereo?
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