Negative impedance driving apparatus having temperature compensa

Details Negative impedance driving apparatus having temperature compensa Negative impedance driving apparatus having temperature compensa

1989-10-13

1990-12-25

Isen, Forester W.

Electrical audio signal processing systems and devices

Loudspeaker feedback

381 59, H04R 300

Patent

active

049809202

ABSTRACT:
A driving apparatus for negative-impedance driving a speaker as a load, comprises a detection element, a positive feedback circuit, a temperature compensation circuit, a sensor element, a control circuit, and an input f characteristic control circuit. The resistor as the detection element connected in series with the load detects a current flowing through the load. The feedback circuit feeds back a detection output of the detection element to an input side of the driving apparatus. The temperature compensation circuit controls the negative-impedance driving state to compensate for an increase in load impedance upon an increase in temperature of the load. The sensor element detects that a temperature of the load reaches a predetermined value. The control circuit stops temperature compensation of the temperature compensation circuit or decreases a degree of temperature compensation in accordance with an output from the sensor element. The input f characteristic control circuit controls frequency characteristic of an input signal in accordance with an output from the control circuit.

REFERENCES:
patent: 4387270 (1983-06-01), Sakano et al.
patent: 4395588 (1983-07-01), Franssen et al.
patent: 4550430 (1985-10-01), Meyers
patent: 4573189 (1986-02-01), Hall
patent: 4614914 (1986-09-01), Hofer
patent: 4837832 (1989-06-01), Fanshel

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