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Shotgun Microphone

A type of microphone characterized by an extremely directional polar pattern. Shotgun mics may be condenser or dynamic, but are almost always built with a long (8 to 24 inch) tube protruding from the front. This tube has a series of holes or slots along the side, which act as a phase canceling device for sounds coming from the rear of the microphone. Sounds coming from directly in front of the mic enter each of the holes or slots in succession and therefore add in phase by the time they reach the diaphragm. Sounds from the rear enter in reverse order and thus are out of phase when they reach the diaphragm, resulting in little or no output. The longer the tube the more directional the microphone becomes. These properties make them ideal for pinpointing and capturing the audio of something from far away without capturing as much of all the ambient (or surrounding) sound. Shotgun mics are sometimes called Line Microphones.

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