Electrical audio signal processing systems and devices – Hearing aids – electrical – Specified casing or housing
Patent
1987-09-28
1989-07-11
Hix, L. T.
Electrical audio signal processing systems and devices
Hearing aids, electrical
Specified casing or housing
381193, 181163, 181165, 181170, 181172, 181174, 181166, H04R 906
Patent
active
048479080
ABSTRACT:
An electrodynamic loudspeaker (1) has a diaphragm comprising a central part (2) and a peripheral part (3), and a voice-coil device (9, 10) coupled to the central part (2). The surface ratio S.sub.2 /S.sub.1 complies with the relationship 0.5.ltoreq.S.sub.2 /S.sub.1 .ltoreq.6, where S.sub.1 and S.sub.2 are the surface areas of the central part (2) and the peripheral part (3) respectively. The mass ratio m.sub.2 /m.sub.1 complies with the relationship 0.5.ltoreq.m.sub.2 /m.sub.1 .ltoreq.8 where m.sub.1 and m.sub.2 are the mass of the central part (2) and the voice-coil device (9, 10) and the mass of the peripheral part (3) respectively. Further, the stiffness imposed on the diaphragm by the space (6, 6') defined by the diaphragm (2, 3) and the chassis (4) and/or the magnet system (7) is smaller than the stiffness of the diaphragm itself. Thus it is possible to derive a car loudspeaker which has a specific dip in its frequency response characteristic P (FIG. 2a), measured in an anechoic room.
REFERENCES:
patent: 2863520 (1958-12-01), Manley et al.
patent: 4057694 (1977-11-01), Obuchi
John Carter, "Digital Simulator for Automotive Sound System Design", Audio Systems Publication, 142, pp. 31-34, Feb. 1984.
Ludwig Klapproth, "Acoustic Characteristics of the Vehicle Environment", Preprint No. 2185 (C-3) of the 77th AES Convention in Hamburg, Mar. 1985.
Bax Johannes W. T.
de Haas Franciscus C. M.
Kamphues Johannes J. M.
Nieuwendijk Joris A. M.
Brown Brian W.
Franzblau Bernard
Hix L. T,.
U.S. Philips Corp.
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