Protective circuit for electroacoustic transducer with hall elem

Details Protective circuit for electroacoustic transducer with hall elem Protective circuit for electroacoustic transducer with hall elem

1977-09-20

1979-07-31

Stellar, George G.

179 1A, 179 1VL, H04R 300

Patent

active

041631196

ABSTRACT:
The output signal of an l-f (low-frequency) power amplifier is supplied to an electroacoustic transducer, through an inductive element for preventing parasitic oscillation, to cause the inductive element to generate a magnetic flux whose density depends on the output current signal of the power amplifier while a current according to the magnitude of the output voltage signal of the power amplifier is supplied to the current input terminals of a Hall-effect element disposed in the magnetic field induced by the inductive element, so that a voltage according to the output power of the l-f power amplifier is taken out of the output terminals of the Hall-effect element. When the voltage exceeds a predetermined level, the l-f signal supplied to the electroacoustic transducer is attenuated by a signal attenuating circuit so that the transducer is prevented from being damaged.

REFERENCES:
patent: 3284726 (1966-11-01), Kotecki
patent: 3370246 (1968-02-01), O'Brien
patent: 3373330 (1968-03-01), O'Brien
patent: 3388318 (1968-06-01), O'Brien
patent: 3408575 (1968-10-01), Petrocelli et al.
patent: 3551706 (1970-12-01), Chapman
patent: 3935513 (1976-01-01), Suzuki
The Right Angle, Feb. 1964, vol. 11, No. 3, pp. 4 & 5, "Audio Frequency Power Measurements Using the Hall Effect", J. W. Sauber.
National Technical Report, (Japan) vol. 16, No. 3, Jun. l970, pp. 377-389, "Temperature Rise of Loudspeaker Voice Coil and Design of Loudspeaker", N. Atoji et al.

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