Electrical audio signal processing systems and devices – Circuitry combined with specific type microphone or loudspeaker
Patent
1989-10-05
1991-05-07
Isen, Forester W.
Electrical audio signal processing systems and devices
Circuitry combined with specific type microphone or loudspeaker
381190, 381202, H04R 300
Patent
active
050143212
ABSTRACT:
The invention relates to a wide passband omnidirectional loudspeaker which has particular application to high fidelity sound reproduction. The loudspeaker has a rigid, magnetostrictive, spherical diaphragm (3), a medium and high frequency electric control means connected to two terminals (4,5) located at two diametrically opposite points of the diaphragm for creating in the vicinity thereof a homogeneous magnetic field with respect to an electric signal applied to the terminals (4,5) of the control means after filtering (2) for eliminating the low frequencies, and a d.c. polarization means (11,12) for the diaphragm. The loudspeaker also has another low frequency electric control means (14) receiving the electric signal after filtering for eliminating the medium and high frequencies. This low frequency electric control means extends longitudinally along an axis (X'X) of the diaphragm and has two ends (16,17) respectively joined to two opposite zones of the diaphragm (3) traversed by axis (X'X).
REFERENCES:
patent: 4742499 (1988-05-01), Butler
GB-A-1 124 127 (Gunnar Magnus Bergstrand).
EP-A-0 177 383 (Commissariate A L'Energie Atomique) Revendications Figures.
EP-A-0 075 911 (S. Klein) Revendications; Fig. 3; p. 8, ligne 20-p. 10. ligne 6.
EP-A-0 063 094 (S. Klein) En entier.
FR-A-862 867 (M. Compare) En entier.
FR-A-1 146 757 (A. Dodinet) Figures.
Commissariat a l''Energie Atomique
Isen Forester W.
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