transmission loss

10.46  transmission loss; sound insulation. Of a partition, for a specified frequency or frequency band, difference in decibels between the average sound pressure levels in the reverberant source and receiving rooms, plus ten times the logarithm to the base ten of the ratio of the area of the common partition to the total Sabine absorption in the receiving room. Unit, decibel (dB); abbreviation, TL.

Annotation              See also 5.35.

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  • transmission loss
    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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