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: ''For the wave filter invented by Zobel and sometimes named after him see m-derived filters.'' Zobel networks are a type of filter section based on the image-impedance design principle. They are named after Otto Zobel of Bell Labs, who published a much-referenced paper on image filters in 1923.〔Zobel, O. J., ''Theory and Design of Uniform and Composite Electric Wave Filters'', Bell Systems Technical Journal, Vol. 2 (1923), pp. 1–46.〕 The distinguishing feature of Zobel networks is that the input impedance is fixed in the design independently of the transfer function. This characteristic is achieved at the expense of a much higher component count compared to other types of filter sections. The impedance would normally be specified to be constant and purely resistive. For this reason, they are also known as constant resistance networks. However, any impedance achievable with discrete components is possible. Zobel networks were formerly widely used in telecommunications to flatten and widen the frequency response of copper land lines, producing a higher-quality line from one originally intended for ordinary telephone use. However, as analogue technology has given way to digital, they are now little used. When used to cancel out the reactive portion of loudspeaker impedance, the design is sometimes called a Boucherot cell. In this case, only half the network is implemented as fixed components, the other half being the real and imaginary components of the loudspeaker impedance. This network is more akin to the power factor correction circuits used in electrical power distribution, hence the association with Boucherot's name. A common circuit form of Zobel networks is in the form of a bridged T. This term is often used to mean a Zobel network, sometimes incorrectly when the circuit implementation is, in fact, something other than a bridged T. ==Derivation== The basis of a Zobel network is a balanced bridge circuit as shown in the circuit to the right. The condition for balance is that; : If this is expressed in terms of a normalised ''Z''0 = 1 as is conventionally done in filter tables, then the balance condition is simply; : In other words, is simply the inverse, or dual impedance of . The bridging impedance ''Z''''B'' is across the balance points and hence has no potential across it. Consequently, it will draw no current and its value makes no difference to the function of the circuit. However, its value is often chosen to be ''Z''0 for reasons which will become clear in the discussion of bridged T circuits. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Zobel network」の詳細全文を読む スポンサード リンク
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