This is usually known as a shotgun or rifle mic because of its similarity in appearance to a gun barrel.
The slots in the barrel allow off-axis sound to cancel giving a highly directional response.
The longer the mic, the more directional it is.
The sound quality of these microphones is inferior to normal mics so they are only used out of necessity.
A close relation of the interference tube microphone is the parabolic reflector mic.
This looks like a satellite dish antenna and is used for recording wildlife noises, and at sports events to capture comments from the pitch.
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