Electrical audio signal processing systems and devices – Loudspeaker feedback
Reexamination Certificate
2007-08-21
2007-08-21
Chin, Vivian (Department: 2615)
Electrical audio signal processing systems and devices
Loudspeaker feedback
C381S096000, C381S401000, C381S396000, C335S231000, C336S200000
Reexamination Certificate
active
10270733
ABSTRACT:
The invention relates to an improved electro-dynamic loudspeaker. The electro-dynamic loudspeaker comprises (a) a voice coil for generating an acoustic waveform, the voice coil being longitudinally movable from an initial rest position to generate the acoustic waveform; (b) a second element of the loudspeaker, the second element being stationary relative to the voice coil; (c) an inductance-affecting core mounted on the voice coil for movement therewith, the inductance-affecting core having a length and a variable inductance-affecting capacity; (d) at least one inductor adjoining the inductance-affecting core and mounted on the second element, the at least one inductor having an associated length shorter than the length of the conductor core such that only a variable portion of the inductance-affecting core adjoins the inductor, the variable portion having a variable average inductance-affecting capacity and a portion length substantially equal to the associated length of the at least one inductor; and, (e) a position sensor circuit connected to the at least one inductor for providing a variable signal based on the variable average inductance-affecting capacity of the variable portion of the inductance-affecting core adjoining the at least one inductor. The variable average inductance-affecting capacity of the variable portion varies with the degree of deflection of the voice coil relative to the second element to vary the variable signal.
REFERENCES:
patent: 3047681 (1962-07-01), Winker
patent: 3647969 (1972-03-01), Korn
patent: 3798374 (1974-03-01), Meyers
patent: 3821473 (1974-06-01), Mullins
patent: 3889060 (1975-06-01), Goto et al.
patent: 3941932 (1976-03-01), D'Hoogh
patent: 4176305 (1979-11-01), Cuno
patent: 4180706 (1979-12-01), Bakgaard
patent: 4207430 (1980-06-01), Harada et al.
patent: 4229618 (1980-10-01), Gamble
patent: 4243839 (1981-01-01), Takahashi et al.
patent: 4256923 (1981-03-01), Meyers
patent: 4276443 (1981-06-01), Meyers
patent: 4395588 (1983-07-01), Franssen et al.
patent: 4395711 (1983-07-01), Ward
patent: 4488012 (1984-12-01), Matsuda et al.
patent: 4550430 (1985-10-01), Meyers
patent: 4573189 (1986-02-01), Hall
patent: 4592088 (1986-05-01), Shimada
patent: 4609784 (1986-09-01), Miller
patent: 4709391 (1987-11-01), Kaizer et al.
patent: 4727584 (1988-02-01), Hall
patent: 4821328 (1989-04-01), Drozdowski
patent: 5086473 (1992-02-01), Erath
patent: 5181251 (1993-01-01), Schultheiss et al.
patent: 5185805 (1993-02-01), Chiang
patent: 5197104 (1993-03-01), Padi
patent: 5408533 (1995-04-01), Reiffin
patent: 5418860 (1995-05-01), Daniels
patent: 5438625 (1995-08-01), Klippel
patent: 5533134 (1996-07-01), Tokura et al.
patent: 5542001 (1996-07-01), Reiffin
patent: 5771300 (1998-06-01), Daniels
patent: 6104817 (2000-08-01), Ding
patent: 6404319 (2002-06-01), Iida et al.
patent: 6694037 (2004-02-01), Robinson et al.
patent: 0134092 (1985-03-01), None
Wolfgang Klippel, The Mirror Filter—A New Basis for Reducing Nonlinear Distortion and Equalizing Response in Woofer Systems, J. Audio Eng. Soc., Sep. 1992, 675-691, vol. 40.
P.G.L. Mills and M.O.J. Hawksford, Distortion Reduction in Moving-Coil Loudspeaker Systems Using Current-Drive Technology, J. Audio Eng. Soc., Mar. 1989, 129-148, vol. 37.
D.R. Birt, Nonlinearities In Moving-Coil Loudspeakers With Overhung Voice Coils, J. Audio Eng. Soc., Apr. 1991, 219-231, vol. 39.
Jonathan Scott, Jonathan Kelly and Glenn Leembruggen, New Method of Characterizing Driver Linearity, J. Audio Eng. Soc., Apr. 1996, 258-265, vol. 44.
Wolfgang Klippel, Nonlinear Large-Signal Behavior of Electrodynamic Loudspeakers at Low Frequencies, J. Audio Eng. Soc., Jun. 1992, 483-496, vol. 40.
Johan Suykens, Joos Vandenwalle and Johan Van Ginderdeuren, Feedback Linearization of Nonlinear Distortion in Electrodynamic Loudspeakers, J. Audio Eng. Soc., Sep. 1995, 690-694, vol. 43.
Audio Products International Corp.
Bereskin and Parr
Chin Vivian
Tran Con P.
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