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directional microphone
di·rec·tion·al mi·cro·phone (plural di·rec·tion·al mi·cro·phones)


noun 
Definition:
 
microphone dependent on its direction: a microphone whose output depends very strongly on the direction in which it is pointing
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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