Efficient Fractional Delay Hilbert Transform Filter in the Farrow structure

In this paper the design and application of a Fractional delay Hilbert transform filter (FDHTF) into an adaptive sub-sample delay estimation between two separated sinusoidal signals is considered. The FDHTF incorporates the functions of Hilbertian and variable fractional delay filtering of the incoming signal simultaneously, in one stage. In traditional approach each of these operations was performed separately. Obtained value of delay is utilized for steering the adaptive FDHTF. Efficiency of this filter was enhanced by using the Farrow structure.