The larynx microphone , which is worn directly on the outside of the larynx , is also used for voice communication in conjunction with protective suits, helmets and oxygen masks in extremely noisy surroundings.
In the technical sense, it is a pickup and not a microphone , since structure-borne sound and not air- borne sound is converted. For this reason, the larynx microphone does not pick up any ambient sound (from the surrounding air). Typical is the construction with a pair of sound sensors, each one rests at an angle on one side of the larynx.
Inadequate speech transmission results from the fact that, among other things, sibilants cannot be reproduced adequately.
Larynx microphones are available in different versions: With older versions, the microphone is attached with the help of a stretch band that is placed around the entire neck so that it rests on the larynx. The younger versions often have side pickups similar to earphones or padded plastic hangers that are placed around the neck.
Larynx microphones were already used in World War II , e.g. B. from tank crews .
A related design is the skull microphone integrated in protective helmets , which also uses structure-borne noise.
- Fritz Kühne: mono, stereo and transistor microphones. 7th edition, Franzis Verlag, Munich, 1966