Vesa Välimäki1 and Timo I. Laakso2

1 Helsinki University of Technology, Laboratory of Acoustics and Audio Signal Processing, P.O. Box 3000, FIN-02015 HUT, Espoo, Finland
2 Helsinki University of Technology, Signal Processing Laboratory, P.O. Box 3000, FIN-02015 HUT, Espoo, Finland


In numerous applications, such as communications, audio and music technology, speech coding and synthesis, antenna and transducer arrays, and time delay estimation, not only the sampling frequency but the actual sampling instants are of crucial importance. Digital fractional delay (FD) filters provide a useful building block that can be used for fine-tuning the sampling instants, i.e., implement the required bandlimited interpolation. In this paper an overview of design techniques and applications is given.

Keywords: Digital filter design, digital signal processing, fractional sample delay, interpolation, allpass filter.

This paper was published as an Invited Paper in the Proceedings of the 2000 IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP'00), vol. 6, pp. 3870-3873, Istanbul, Turkey, June 5-9, 2000.

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Last modified: 11 August 2000
Author: Vesa Välimäki