Speaker excursion control system

Details Speaker excursion control system Speaker excursion control system

1994-10-18

1996-08-20

Isen, Forester W.

Electrical audio signal processing systems and devices

Audio transducer protection circuitry

381100, 381 86, H03G 1100

Patent

active

055486509

ABSTRACT:
A speaker excursion control circuit for driving relatively small diameter speakers at their maximum output while assuring minimum distortion of acoustical output from such transducers detects signals which may cause over excursion and dynamically controls the amplitude of signals applied to the power amplifier coupled to the speakers. In one embodiment of the invention a single state-variable filter is employed with a voltage controlled amplifier controlled by a low pass output of the state-variable filter to provide the speaker signal control. In another embodiment, a pair of state-variable filters are employed with the first of such filters defining a model for the speaker cone excursion and providing control output signals to a second state-variable filter which dynamically shifts its filtering characteristics causing increased signal attenuation when the control signals indicate that speaker over excursion may occur.

REFERENCES:
patent: 3544720 (1970-12-01), Corderman
patent: 3890465 (1975-06-01), Kaizu
patent: 3925708 (1975-12-01), Picciochi
patent: 3962607 (1976-06-01), Burns
patent: 4122507 (1978-10-01), Queen
patent: 4296278 (1981-10-01), Cullision et al.
patent: 4327250 (1982-04-01), von Recklinghausen
patent: 4583245 (1986-04-01), Gelow et al.
patent: 4987564 (1991-01-01), Yokoyama

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