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In telecommunications, insertion loss is the loss of signal power resulting from the insertion of a device in a transmission line or optical fiber and is usually expressed in decibels (dB). If the power transmitted to the load before insertion is ''P''T and the power received by the load after insertion is ''P''R, then the insertion loss in dB is given by, : ==Electronic filters== Insertion loss is a figure of merit for an electronic filter and this data is generally specified with a filter. Insertion loss is defined as a ratio of the signal level in a test configuration without the filter installed (|''V''1|) to the signal level with the filter installed (|''V''2|). This ratio is described in dB by the following equation: : Note that, for most filters, |''V''2| will be smaller than |''V''1|. In this case, the insertion loss is positive and measures how much smaller the signal is after adding the filter. 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「insertion loss」の詳細全文を読む スポンサード リンク
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