Dr Ko Chi Chung
Dr. Lim Yong Ching
Dr. Koh Soo Ngee

A New Filtering Scheme for Split-band Voice Coding

Abstract >> This paper presents a new filtering scheme for splitting speech signals into sub-bands whichresults in no aliasing problem when the sub-band signals are sub-sampled and recombined. The high-pass andlow-pass filters are an odd-length complementary linear phase filter pair. As a consequence, the high-passoutput can be obtained by subtracting the low-pass filter output from the appropriately delayed input. This produces a factor-of-tvo reduction in the computation load when compared to the conventional even-lengthquadrature mirror filter. Another factor-of-two saving in computation load can be gained by using half-bandlow-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 IREE Norman Hayes Memorial Award, by the Information, Telecommunications & Electronics Engineering Society, Australia [1990] For the most meritorious paper published in the IREE Journal of Electrical and Electronics Engineering, Australia in 1989.

Journal of Electrical and Electronics Engineering, Australia
— IE Aust. & IREE Aust.
Publication Date: March/June 1989
Volume: 9, Issue 1/2 on page(s): pp. 27-34

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For further information, please contact:
Dr. Ko Chi Chung
Email: elekocc@nus.edu.sg
Telephone: 6516 4490