M. Djamah and D. O'Shaughnessy (Canada)
Fast search, LSF, speech coding, MELP coder, tree structured vector quantization.
Vector quantization (VQ) is widely used in speech coding applications. In real-time applications, the reduction of encoding complexity is important. In this paper, a fast search encoding algorithm using multistage tree structured vector quantization (MTVQ) is proposed for quantization of line spectral frequencies (LSF’s). The proposed method is compared to the multipath sequential tree-assisted search (MSTS) and to the well known multipath sequential search (or M-L search) algorithms. The Federal standard MELP coder is modified by replacing the original LSF quantizer with a MTVQ using the proposed fast search procedure and an evaluation of the produced speech quality is given.
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