A Cardioid Directional Microphone

A microphone is described which has uniform directivity over a wide frequency range. This is made possible by placing in a single instrument a dynamic type pressure microphone element and a ribbon type “velocity” element, and electrically equalizing the outputs before combination. The resultant directional pattern is a heart-shaped curve or cardioid, giving a fairly wide pick-up zone in front and a substantial dead zone at the back of the instrument. Because of the unusually rugged ribbon employed, the new microphone is much less susceptible to wind noise than ordinary ribbon types. Housed in an aluminum case, the microphone weighs only 3¼ lbs. High output level, low impedance, and high quality, together with the excellent directivity, promise to make the cardioid microphone an important tool for the motion picture sound engineer.

Print ISSN

0097-5834

Published

1939-09

Content type

Original Research

DOI

10.5594/J11953