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1. 发明授权

US3895309A Sub networks for filter ladder networks 失效
标题翻译：滤波梯形网络的子网络
公开(公告)号：US3895309A
公开(公告)日：1975-07-15
申请号：US43217674
申请日：1974-01-10
申请人： POST OFFICE
发明人： ROLLETT JOHN MORTIMER , WISE DAVID RICHARD
IPC分类号： H03H11/08 , H03H11/12 , H03F1/36
CPC分类号： H03H11/12
摘要： The invention concerns a subnetwork of a filter circuit which is useful for detecting the dialing tone used in a telephone system. The arrangement employs active devices such as operational amplifiers in circuit with passive resistive and capactive elements to simulate an inductance S. Although it is known to modify a gyrator circuit to produce a 1/s2 function it has hitherto been considered that the use of such simulated functions in a ladder filter network would produce an unstable arrangement. It has been found that the combination of a 1/s2 element in series with a simulated 1/s element is stable and suitable for use in ladder filter networks.
摘要翻译：本发明涉及一种用于检测在电话系统中使用的拨号音的滤波器电路的子网络。该装置采用诸如运算放大器之类的有源器件，具有无源电阻和有源元件的电路以模拟电感S.尽管已知修改回转器电路以产生1 / s2功能，但迄今为止已经认为使用这种模拟梯形滤波器网络中的功能将产生不稳定的布置。已经发现，与模拟1 / s元件串联的1 / s2元件的组合是稳定的并且适用于梯形滤波器网络。

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