Title :
An acoustic lens as a directional microphone
Author_Institution :
Bell Telephone Laboratories, Inc., Murray Hill, N.J.
Abstract :
An acoustic lens combined with a conical horn can be used to obtain a highly directional microphone without some of the disadvantages of the parabolic microphone. The directional characteristics can be calculated satisfactorily if one assumes that the horn provides uniform flooding of the lens aperture.
Keywords :
Acoustic beams; Acoustic transducers; Apertures; Bars; Floods; Frequency; Lenses; Microphones; Microwave devices; Telephony;
Journal_Title :
Audio, Transactions of the IRE Professional Group on
DOI :
10.1109/T-SP.1954.28212
