Unlike the uniform theory of diffraction (UTD), BTM does not make the high frequency assumption (in which edge lengths and distances from source and receiver are much larger than the wavelength).
[1] The impulse response according to BTM is given as follows:[2] The general expression for sound pressure is given by the convolution integral where
represents the impulse response at the receiver position.
The BTM gives the latter in terms of as an integral over edge positions
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