ACOUSTIC TRANSMISSION COEFFICIENTS ACCORDING TO ISO 16283 STANDARD
They are used to measure the soundproofing effectiveness of artifacts used in the construction of buildings, such as walls, windows, doors, etc.
They are various and adaptable to different situations:
Dw - Weighted Difference level
R - Sound Reduction Index
R' - Apparent Sound Reduction Index
Dn - Normalized Level Difference
DnT - Standardized Level Difference