DIRECTIONAL ACOUSTIC DEVICE

A directional acoustic device that has an acoustic source or an acoustic receiver, and a conduit to which the acoustic source or acoustic receiver is acoustically coupled and within which acoustic energy travels in a propagation direction from the acoustic source or to the acoustic receiver, the con...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	JANKOVSKY, Joseph, ICKLER, Christopher, B, COFFEY, Joseph, A
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	DEAF-AID SETS ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKEACOUSTIC ELECTROMECHANICAL TRANSDUCERS PUBLIC ADDRESS SYSTEMS
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