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专利名称：Protective circuit for electroacoustic
transducer with hall element and voice coiltemperature rise time constant circuit
发明人：Tatsuo Baba,Yoshito Ohmura,Hiroshi
Fukushima,Hideo Fukuma
申请号：US05/834901申请日：19770920公开号：US04163119A公开日：19790731
摘要：The output signal of an l-f (low-frequency) power amplifier is supplied to anelectroacoustic transducer, through an inductive element for preventing parasiticoscillation, to cause the inductive element to generate a magnetic flux whose densitydepends on the output current signal of the power amplifier while a current according tothe magnitude of the output voltage signal of the power amplifier is supplied to thecurrent input terminals of a Hall-effect element disposed in the magnetic field inducedby the inductive element, so that a voltage according to the output power of the l-fpower amplifier is taken out of the output terminals of the Hall-effect element. Whenthe voltage exceeds a predetermined level, the l-f signal supplied to the electroacoustictransducer is attenuated by a signal attenuating circuit so that the transducer isprevented from being damaged.
申请人：HITACHI LTD
代理机构：Craig and Antonelli
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