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Transmission loss (TL) in general describes the accumulated decrease in intensity of a waveform energy as a wave propagates outwards from a source, or as it propagates through a certain area or through a certain type of structure. It is a terminology frequently used in optics and acoustics. Measures of TL are very important in the industry of acoustic devices such as mufflers and sonars. ==Measurement== Measurement of transmission loss can be in terms of decibels. Mathematically, transmission loss is measured in dB scale and in general it can be defined using the following formula: : where: * is the power of incident wave coming towards a defined area (or structure); * is the power of transmitted wave going away from the defined area (or structure). Transmission loss may refer to a more specific concept in one of the field below. 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「transmission loss」の詳細全文を読む スポンサード リンク
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