The problem of sound screening by a wedge shaped barrier is addressed. Assumption is made on the position of the receiver to be in the shadow of the sound source field. For an ideally hard wedge several reliable models exist for a point-like sound source. For an absorbing wedge a recently published model adopted for a cylindrical wave incidence is presented. Numerical calculations show that the amplitude of the edge diffracted field is larger for increasing flow resisitivity of the wedge impedance and for increasing wedge angle. Consequently, the noise shielding performance for an impedance barrier diminishes for increasing value of the barrier's top angle. Experiments at the scale model level give a further evidence to these findings.
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