Showing papers by "A. J. Berkhout published in 1980"
TL;DR: In this article, an omnidirectional loudspeaker is used which is driven by an amplified sweep: a signal containing all frequencies of interest smeared out in time, and an almost perfect pulse is obtained with a high peak pressure and a short effective duration.
Abstract: A new method is proposed to acquire impulse responses in concert halls with large signal‐to‐noise ratios and with a high resolution. In our proposal an omnidirectional loudspeaker is used which is driven by an amplified sweep: a signal containing all frequencies of interest smeared out in time. By using a deconvolution technique, an almost perfect pulse is obtained with a high peak pressure and a short effective duration. Measurements were made in two different concert halls to illustrate the practical implications of the new technique.
60 citations
TL;DR: In this paper, it was shown that the Kirchhoff-summation operator is of a very wideband nature and even contains an evanescent part, which may cause serious aliasing errors, particularly for small extrapolation steps.
Abstract: It is shown that the so-called Kirchhoff-summation operator is of a very wide-band nature and even contains an evanescent part. As a consequence, discretization may cause serious aliasing errors, particularly for small extrapolation steps. It is proposed to use in all practical cases band-limited versions of the summation operator, the spatial cut-off frequency being determined by the spatial Fourier spectrum of the coherent noise.
13 citations