Transform domain IIR filtering

The paper provides a generalization on the concept of the transform domain filtering (TDF). TDF is block-based filtering, or vector-filtering, applied to transform domain data to get the effect of desired time domain filtering. The result is transform domain IIR filtering (IIR-TDF) and it takes in the existing TDF, or FIR-TDF, as its special case. The resulting structures are two-fold-direct I form and direct II form-and are both block-filtering structures.<
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