Active cancellation of pressure at a point in a pure tone diffracted diffuse sound field

Abstract In this paper the extension of the average zones of quiet produced in a diffuse acoustic field is studied when the acoustic is cancelled at a point near a reflecting surface by using a remote secondary source. Analytical expressions for the extension of the zones of quiet generated when the cancellation point is close or on the surface of a rigid sphere, a wall, a two-wall edge and a corner have been derived. These theoretical results are compared with simulation results for the pressure in the vicinity of the cancellation point, and show good agreement.