Microphones for use in noisy places, e.g., military aircraft, have always been a headache for acoustic engineers. If placed close in front of the mouth, they pick up a great deal of "ambient" noise, as well as sounds that come from the wearer's breathing. Throat microphones are noisy, too, and not ideally intelligible. Both types can be a nuisance to the wearer and interfere with other equipment.
At Ohio State University, Drs. Henry M. Moser, John J. Dreher and Herbert Oyer, backed by the Air Force, are trying to develop a special ear microphone. They have found that when a speaker's mouth...
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