Smart amplifier for loudspeaker motional feedback derived from l

Details Smart amplifier for loudspeaker motional feedback derived from l Smart amplifier for loudspeaker motional feedback derived from l

1994-12-06

1996-07-30

Kuntz, Curtis

Electrical audio signal processing systems and devices

Loudspeaker feedback

381194, 381199, H04R 300

Patent

active

055420010

ABSTRACT:
A motional feedback loudspeaker system provides acceptable bass performance even with inexpensive speakers by the reduction of nonlinear distortion with the use of feedback derived from the back emf signal generated by the motion of the voice-coil within the magnet field. A novel linearizing circuit corrects the nonlinearity of the back emf signal due to the falloff of the BL factor as a function of cone displacement. The linearizing circuit is a recursive feedback loop comprising a multiplier for multiplying the back emf signal by a corrective function which is the inverse of the BL nonlinearity so as to provide a velocity signal linearly proportional to the cone velocity, an integrator for integrating the velocity signal to generate a displacement signal linearly proportional to the cone displacement, and a correction generator comprising a nonlinear curve shaper responsive to the displacement signal to generate said corrective function.

REFERENCES:
patent: 4369412 (1983-01-01), Sakano
patent: 4379209 (1983-04-01), Sakano
patent: 4387270 (1983-06-01), Sakano et al.
patent: 4488012 (1984-12-01), Matsuda et al.
patent: 4908870 (1990-03-01), Nagi
patent: 5009281 (1991-04-01), Yokoyama
patent: 5181251 (1993-01-01), Schultheics et al.

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