ELECTROACOUSTIC CONVERSION SYSTEM

PROBLEM TO BE SOLVED: To give phone-like acoustic feeling and deep feeling by improving the acoustic characteristic (efficiency, flatness) of a speaker system with a usual sounding tube. SOLUTION: This system is provided with a closed side wall 32 including at least a parabolic curved face or an ell...

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Bibliographische Detailangaben
1. Verfasser:	ATOJI NOBUHISA
Format:	Patent
Sprache:	eng
Schlagworte:	DEAF-AID SETS ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKEACOUSTIC ELECTROMECHANICAL TRANSDUCERS PUBLIC ADDRESS SYSTEMS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To give phone-like acoustic feeling and deep feeling by improving the acoustic characteristic (efficiency, flatness) of a speaker system with a usual sounding tube. SOLUTION: This system is provided with a closed side wall 32 including at least a parabolic curved face or an elliptic curved face between a mutually confronting pair of mutually confronting flat side walls 30 and 31, and the sounding tube 29 which is provided with a thin and long opening part 33 in the expanding and opening direction of this closed side wall 32 to acoustically open one end. Then a throat hole is opened at a part where axes passing through in the neighborhood of the focus of the sounding tube of either of a pair of flat side walls cross, and a speaker unit is fixed to cover the throat hole to improve efficiency by utilizing the resonant sound pressure peak according to a rule (λ/4).