5.35 transmission loss; propagation loss. Reduction in magnitude of some characteristic of a signal between two stated points in a transmission system.
Annotation 1 The characteristic is often some kind of level, such as power level or voltage level; in acoustics the characteristic that is commonly measured is sound pressure level. Thus, since the levels are expressed in decibels, transmission loss should likewise be expressed in decibels.
Annotation 2 It is imperative that the characteristic concerned (such as sound pressure level) be clearly identified because in all transmission systems more than one characteristic is propagated.
Annotation 3 See 10.46 for transmission loss in architectural acoustics.
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