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公开(公告)号：US5012890A
公开(公告)日：1991-05-07
申请号：US323667
申请日：1989-03-15
申请人： Katsuo Nagi , Kazunari Furukawa
发明人： Katsuo Nagi , Kazunari Furukawa
CPC分类号： H04R1/2826 , H04R3/002
摘要： In an acoustic apparatus in which a vibrator is arranged in a Helmholtz's resonator having an open duct port, and the vibrator is driven to radiate a resonant acoustic wave, a duct resonance absorbing means is provided to the open duct port constituting the Helmholtz's resonator so as to remove an unnecessary resonant sound other than a Helmholz's resonant sound caused when the Helmholtz's resonator is driven, thereby removing noise in a radiated acoustic wave and improving distortion characteristics.
摘要翻译： 在具有开口管口的亥姆霍兹共振器中设置有振子的声学装置中，驱动该振动体以辐射共振声波，在构成亥姆霍兹共振器的开口管道上设置管道共振吸收装置， 以除去在亥姆霍兹共振器被驱动时引起的赫尔姆霍尔斯共振声音以外的不必要的共振声音，从而消除辐射声波中的噪声并改善失真特性。
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2.发明授权Driving apparatus, and control information storage body and protection circuit therefor 失效驱动装置及控制信息存储体及其保护电路
公开(公告)号：US5014320A
公开(公告)日：1991-05-07
申请号：US353444
申请日：1989-05-17
申请人： Katsuo Nagi , Kazunari Furukawa
发明人： Katsuo Nagi , Kazunari Furukawa
摘要： A driving apparatus for driving an electro-acoustic transducer comprises a main body portion and a control information storage body which is arranged independently of the main body portion and is selectively separated from or coupled to the main body portion, as needed. The control information storage body stores a real circuit or information for setting electrical characteristics of the driving apparatus.A driving apparatus further comprises a protection circuit for preventing a disadvantageous result of the driving apparatus and a load caused by an unstable operation and the like when the control information storage body is attached/detached to/from the main body portion or when an inappropriate control information storage body is loaded onto the main body portion.
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公开(公告)号：US4908870A
公开(公告)日：1990-03-13
申请号：US249383
申请日：1988-09-26
申请人： Katsuo Nagi
发明人： Katsuo Nagi
摘要： A motional load driver for driving a motional load having a motional impedance includes an amplifying section for amplifying an input signal and supplying the input signal to a motional load such as a loudspeaker, a current detecting section for generating an output signal corresponding to a current flowing through the motional load, and a load impedance cancellation current generating section for generating a current corresponding to a magnitude of the output signal generated by the current detecting section and positively feeding back the current to the amplifying section. The current detecting section includes, for example, an impedance element such as a resistor series-connected to the motional load. A voltage between both the terminals of the resistor is converted into a current by a voltage/current converter arranged in the impedance cancelation current generating section, and the current is fed back to the amplifying section. With this arrangement, the motional load can be driven without being influenced by a potential difference between the input and output ground points of the amplifying section.
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