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Title: New filtering scheme for split-band voice coding
Authors: Lim, Y.C. 
Koh, S.N.
Ko, C.C. 
Issue Date: Mar-1989
Citation: Lim, Y.C.,Koh, S.N.,Ko, C.C. (1989-03). New filtering scheme for split-band voice coding. Journal of Electrical and Electronics Engineering, Australia 9 (1-2) : 27-34. ScholarBank@NUS Repository.
Abstract: This paper presents a new filtering scheme for spliting speech signals into sub-bands which results in no aliasing problem when the sub-band signals are sub-sampled and recombined. The high-pass and low-pass filters are an odd-length complementary linear phase filter pair. As a consequence, the high-pass output can be obtained by subtracting the low-pass filter output from the appropriately delayed input. This produces a factor-of-two reduction in the computation load when compared to the conventional even-length quadrature mirror filter. Another factor-of-two saving in computation load can be gained by using half-band low-pass filters whose every other coefficient is zero. Furthermore, the filters can be designed using well-known minimax optimisation techniques such as the Remez exchange algorithm and integer programming.
Source Title: Journal of Electrical and Electronics Engineering, Australia
ISSN: 07252986
Appears in Collections:Staff Publications

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