sound diffraction
Sound diffraction is commonly understood as the bending of sound around objects (shadow zone) but, in fact, it is governed by the same physical process as is the scattering of sound due to an obstacle or an inhomogeneity in its path. Therefore, it denotes the scattering of sound both in the illuminated and shadow zones of an obstacle.
Excess Attenuation (EA) is the spectrum of the ratio of the total sound level at a receiver to the direct sound that would be present in the absence of an object(s) or environment. One may think of it as, how the environment alters direct sound.
EA = 10log |pto/ptd|2 [dB]
pto = total sound level [dB]
ptd = direct sound level [dB]
Excess Attenuation (EA) is the spectrum of the ratio of the total sound level at a receiver to the direct sound that would be present in the absence of an object(s) or environment. One may think of it as, how the environment alters direct sound.
EA = 10log |pto/ptd|2 [dB]
pto = total sound level [dB]
ptd = direct sound level [dB]
insertion loss (IL)
Insertion Loss (EA) is the spectrum of the ratio of the total sound level at a receiver with a sound barrier inserted into the environment, to the total sound level at a receiver without one. It is expressed in dB.
EA = 10log |ptwo/ptw|2
ptwo = total sound level without barrier, [dB]
ptw = total sound level with barrier, [dB]
EA = 10log |ptwo/ptw|2
ptwo = total sound level without barrier, [dB]
ptw = total sound level with barrier, [dB]
excess attenuation
Excess Attenuation (EA) is the spectrum of the ratio of the total sound level at a receiver to the direct sound that would be present in the absence of an object(s) or environment. It is expressed in dB.
EA = 10log |pto/ptd|2
pto = total sound level, [dB]
ptd = direct sound level, [dB]
EA = 10log |pto/ptd|2
pto = total sound level, [dB]
ptd = direct sound level, [dB]