@conference {3234, title = {Approximating Measured Reverberation Using A Hybrid Fixed/Switched Convolution Structure}, booktitle = {Proc. 13th Int. Conf. Digital Audio Effects (DAFx-10)}, year = {2010}, note = {\ }, month = {09/2010}, address = {Graz, Austria}, abstract = {
An efficient reverberator structure is proposed for approximatingmeasured reverberation. A fixed convolution matching the early\ portion of a measured impulse response is crossfaded with a switched\ convolution reverberator drawing its switched convolution section\ from the late-field of the measured impulse response. In this way,\ the early portion of the measured impulse response is precisely reproduced, and the late-field equalization and decay rates efficiently\ approximated. To use segments of the measured impulse response,\ the switched convolution structure is modified to include a normalization filter to account for the decay of the late-field between the\ nominal fixed/switched crossfade time and the time of the selected\ segment. Further, the measured impulse response late-field is extended below its noise floor in anticipation of the normalization.\ This structure provides psychoacoustically accurate synthesis of\ the measured impulse response using less than half a second of\ convolution, irrespective of the length of the measured impulse response. In addition, the structure provides direct control over the\ equalization and late-field frequency dependent decay rate. Emulations of EMT 140 plate reverberator and marble lobby impulse\ responses are presented.
}, keywords = {artificial reverberator}, author = {Lee, Keun Sup and Nicholas Bryan and Jonathan Abel} }