Electrical audio signal processing systems and devices – Audio transducer protection circuitry
Patent
1995-06-26
2000-12-19
Chang, Vivian
Electrical audio signal processing systems and devices
Audio transducer protection circuitry
381111, H03G 1100
Patent
active
061636134
ABSTRACT:
A loudspeaker driver of the dynamic type is designed to be as efficient as possible within only the constraints of cost and material limitations. The resistance of the speaker's voice coil is designed to have only a portion of the total resistance. An external resistor is wired in series with the voice coil to optimize the speaker for use in systems for sound reproduction. The external resistor is placed so that heat dissipated in the external resistor cannot significantly influence the temperature of the voice coil. The external resistor can be made of pure metal, alloys, carbon or use a temperature-dependent diode for the resistor. Different advantages are found in each embodiment. The invention reduces the effects of voice coil heating, inductance and the negative effects of interaction between voice coil and currents in the central pole piece of the loudspeaker. The separate resistor can be used in conjunction with other resistors and/or reactors placed in parallel with the separate resistor to overcome dips in the speaker's frequency response. Loudspeakers made in accordance with the invention have a perceived quality equal to or better than other types, for example electrostatic, ribbon or planar array, that are normally considered to be superior to the dynamic loudspeaker. The usual advantages obtained with the electro-dynamic speaker of small size, dynamic quality and good efficiency are retained in speakers using the invention.
REFERENCES:
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patent: 3697692 (1972-10-01), Hafler
patent: 4093822 (1978-06-01), Steinle
patent: 4593405 (1986-06-01), Frye et al.
patent: 4912086 (1990-03-01), Enz et al.
patent: 5357586 (1994-10-01), Nordschow et al.
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