The LOT: a link between block transform coding and multirate filter banks

The lapped orthogonal transform (LOT) is a novel transform for block signal processing with overlapping basis functions. The LOT can also be viewed as an efficient quadrature-mirror-filter bank in which the analysis and synthesis filters have identical FIR (finite-impulse-response) responses. The author shows that the LOT filter bank leads to perfect signal reconstruction with a relative low level of spectral images. The main advantages of the LOT filter bank are its short filter lengths (twice the number of bands) and its fast algorithm, based on the fast discrete cosine transform.<<ETX>>