发明名称 |
Protective circuit for electroacoustic transducer with hall element and voice coil temperature rise time constant circuit |
摘要 |
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.
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申请公布号 |
US4163119(A) |
申请公布日期 |
1979.07.31 |
申请号 |
US19770834901 |
申请日期 |
1977.09.20 |
申请人 |
HITACHI LTD |
发明人 |
BABA, TATSUO;FUKUMA, HIDEO;FUKUSHIMA, HIROSHI;OHMURA, YOSHITO |
分类号 |
H03F1/52;H02H1/00;H03F1/42;H04R3/00;(IPC1-7):H04R3/00 |
主分类号 |
H03F1/52 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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