trace wavelength

10.62  trace wavelength. The projection of the impinging wave’s airborne wavelength onto the...

coincidence effect

10.61  coincidence effect. Greater sound transmission when sheet material bending (flexural) wave wavelength equals wavelength of airborne sound waves of the same frequency and incident at an acute angle as projected onto the sheet...

limp wall

10.60  limp wall. Panel or wall whose sound transmission properties are determined by the mass per unit area of the panel without...

mass-law sound transmission loss

10.59  mass-law sound transmission loss. Phenomenon whereby doubling the mass per unit area of a panel, or doubling the frequency for a given mass per unit area, increases the sound transmission loss by six...

impact insulation class

10.58  impact insulation class. Single-number rating of impact sound insulation derived by fitting a reference rating curve to the normalized impact sound pressure level values measured for the 16 contiguous one-third octave frequency bands with nominal...