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We investigate time domain boundary element methods for the wave equation in R3,with a view towards sound emission problems in computational acoustics.The Neumann problem is reduced to a time dependent integral equation for the hypersingular operator,and we present a priori and a posteriori error estimates for conforming Galerkin approximations in the more general case of a screen.Numerical experiments validate the convergence of our boundary element scheme and compare it with the numerical approximations obtained from an integral equation of the second kind.Computations in a half-space illustrate the influence of the reflection properties of a flat street.