An efficient approach to noncausal filtering
Chok-Ki Chan, Chih-Fan Chen · IEEE Transactions on Acoustics Speech and Signal Processing · 1984
A new method for designing digital noncausal filters is introduced. The design is based on well developed analog filter approximations and their Wiener-Lee decomposition forms. The resulting filter is linear phase in the passband and suitable for sample-by-sample processing. Comparing with conventional two-pass noncausal recursive filters, the proposed filter has the advantages of a small basic group delay and a small memory size requirement. Moreover, the magnitude and phase responses are exactly known.