Title :
The LOT: a link between block transform coding and multirate filter banks
Author :
Malvar, Henrique S.
Author_Institution :
Dept. of Electr. Eng., Brasilia Univ., Brazil
Abstract :
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
Keywords :
digital filters; encoding; filtering and prediction theory; signal processing; transforms; FIR responses; LOT transform; analysis filters; block signal processing; block transform coding; digital filters; fast algorithm; fast discrete cosine transform; finite-impulse-response; lapped orthogonal transform; multirate filter banks; overlapping basis functions; perfect signal reconstruction; quadrature-mirror-filter bank; short filter lengths; synthesis filters; Channel bank filters; Delay; Discrete cosine transforms; Filter bank; Finite impulse response filter; Image coding; Image reconstruction; Matrices; Signal synthesis; Transform coding;
Conference_Titel :
Circuits and Systems, 1988., IEEE International Symposium on
Conference_Location :
Espoo
DOI :
10.1109/ISCAS.1988.15054
