This letter addresses the problem of adaptive, computationally inexpensive
fractional sample delay estimation using the well-known explicit time delay
estimator technique. The Farrow structure approximation for fast filter re
alisations is suggested which is then used to derive closed form update equ
ations for arbitrary filter designs, with much reduced computational comple
xity. (C) 1999 Published by Elsevier Science B.V. All rights reserved.