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Line Microphones

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1 Author(s)
Olson, Harry F. ; RCA Manufacturing Company, Inc., Camden, N.J.

A line microphone with useful directivity normal to the line axis is described. Several types of line microphones with useful directivity along the line axis are described as follows: A simple line, a line with progressive delay, two simple lines and a pressure-gradient element, two lines with progressive delay, and a pressure-gradient element. An ultra-directional microphone employing line elements exhibits uniform directional characteristics over the range from 85 to 8000 cycles.

Published in:

Proceedings of the IRE  (Volume:27 ,  Issue: 7 )