PORTABLE ACCOUSTIC APPARATUS

A portable acoustic apparatus in which a sound emitting hole (3) is made in the front wall (61) of the case (6) thereof, an acoustic conversion element (1) is supported and secured such that a front air chamber (2) is formed between the front wall (61) and an acoustic conversion element (1) and a ba...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	MIZUTANI, YASUTAKA, MATSUOKA, BUNKEI
Format:	Patent
Sprache:	eng ; fre ; jpn
Schlagworte:	DEAF-AID SETS ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKEACOUSTIC ELECTROMECHANICAL TRANSDUCERS PUBLIC ADDRESS SYSTEMS TELEPHONIC COMMUNICATION
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