A closed-form analytical impulse solution of diffraction by a rigid wedge is interpreted from the point of view of discrete Huygens wavelets emanating from the crest of the wedge. The strengths of these secondary sources and the impulse field diffracted over a second wedge are calculated. Digital Fourier transformation is then used to determine the spectral loss during double diffraction. The technique is applied to a thick plate, an angled wide barrier, and a strip; successful predictions of laboratory experiments are achieved. In principle, the method may be used for any number of diffractions by straight line segments of an extended barrier or scattering surface.