Voice coil excursion and amplitude gain control device

Details Voice coil excursion and amplitude gain control device Voice coil excursion and amplitude gain control device

1993-05-10

1995-05-23

Kuntz, Curtis

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Having electrostatic element

381 59, 381 96, H04R 2500

Patent

active

054188601

ABSTRACT:
An active and passive loudspeaker voice coil excursion and amplitude gain control device is disclosed. The excursion and amplitude gain control device is utilized in connection with a voice coil actuator having a case, a coil and a coil carrier having an extreme downward position contacting the case. The excursion and amplitude gain control device includes a restraining member mounted to the coil carrier, wherein the restraining member is positioned on the carrier such that during downward movement of the coil carrier, the restraining member contacts the case before the coil carrier reaches the extreme downward position. A proximity sensor is mounted to the coil carrier, wherein the proximity sensor produces a proximity signal varying proportional to the distance of the sensor from the extreme downward position. When the proximity signal exceeds a threshold level, a feedback attenuation signal is fed to an electrical circuit that, in response to the proximity signal, sends an attenuation signal to the driving amplifier to limit the amplitude gain of the input signal. Limiting the amplitude gain of the input signal, in turn, limits the excursion of the voice coil and prevents the voice coil from reaching the extreme downward position.

REFERENCES:
patent: 3047661 (1962-07-01), Winker
patent: 4598178 (1986-07-01), Rollins
patent: 4607382 (1986-08-01), Dijkstra et al.
patent: 4821328 (1989-04-01), Drozdowski

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