Digital filtering via block recursion
H. Voelcker, E.E. Hartquist · IEEE Transactions on Audio and Electroacoustics · 1970
Digital filters which have poles in their transfer functions are usually implemented by various direct feedback arrangements. Such filters can also be synthesized in a form amenable to implementation via the FFT. The key feature of this procedure is block feedback through a special finite-response filter. Although the procedure appears to offer few immediate practical advantages, its asymptotic properties are interesting. It also provides a useful conceptual link between recursive and nonrecursive filtering techniques.