Sixth European Conference on Speech Communication and Technology
(EUROSPEECH'99)

Budapest, Hungary
September 5-9, 1999

Low Bit-Rate Speech Coding Using Quantization of Variable Length Segments

R. Mayrench, D. Malah

Department of Electrical Engineering Technion, Haifa, Israel

This paper describes a new segmentation and quantization technique for low bit-rate speech coders. Bit-rate reduction is achieved by combining segmentation and quantization, where a segment consists of one or more adjacent frames. The algorithm for selecting and quantizing segments from a pre-determined number of frames extends the frame-based trellis techniques. It models the input speech as a sequence of variable length segments with the option to interpolate frames in skipped segments. The new algorithm, denoted as Trellis Segmentation-Quantization (TSQ), reduces the bit-rate needed for spectral envelope representation, with only a small degradation in log-spectral distance values. Experimental results show that TSQ achieves a lower spectral distance than alternate frame transmission, matrix quantization and trellis based frame selection and interpolation.


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Bibliographic reference.  Mayrench, R. / Malah, D. (1999): "Low bit-rate speech coding using quantization of variable length segments", In EUROSPEECH'99, 1459-1462.