### Fractional Delay Filters

In *fractional-delay filtering*
applications, the interpolator
typically slides forward through time to produce a time series of
interpolated values, thereby implementing a non-integer signal delay:

*delay line*in order to implement an

*interpolated delay line*(§4.1) that effectively provides a continuously variable delay for discrete-time signals.

The *frequency response* [449] of the fractional-delay
FIR filter is

**Next Section:**

Lagrange Interpolation Optimality

**Previous Section:**

Interpolation of Uniformly Spaced Samples