Paper: On Fractional Delay Interpolation for Local Wave Field Synthesis

At the 24th European Signal Processing Conference (EUSIPCO) conference we presented the contribution

Winter, F.; Spors, S. (2016): “On Fractional Delay Interpolation for Local Wave Field Synthesis.” In: Proc. of the 24th European Signal Processing Conference (EUSIPCO), 2016.

Additional Material can be found here.


Wave Field Synthesis aims at the accurate reproduction of a sound field inside an extended listening area which is surrounded by individually driven loudspeakers. Recently a Local Wave Field Synthesis technique has been published which utilizes focused sources as a distribution of virtual loudspeakers in order to increase the reproduction accuracy in a particular local region. Similar to conventional Wave Field Synthesis, this technique relies heavily on delaying and weighting the input signals of the virtual sound sources. As these delays are in general not an integer multiple of the input signals’ sample rate, delay interpolation is necessary. This paper analyses in how far the accuracy of the delay interpolation influences the spectral properties of the synthesised sound field. The results show, that an upsampling of the virtual source’s input signal is an computationally efficient tool which leads to a significant increase of accuracy.

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