Third European Conference on Speech Communication and Technology

Berlin, Germany
September 22-25, 1993


A 5600 BPS VSELP Speech Coder Candidate for Half-Rate GSM

Ira A. Gerson, Mark A. Jasiuk

Corporate Systems Research Laboratories, Motorola Inc., Schaumburg, IL, USA

The bit rate for the speech and channel coder for the half-rate GSM channel is 11400 bps. A 5600 bps VSELP speech coder designed for this application is described. This speech coder is one of two candidates being considered by GSM for the half-rate channel. It employs a novel strategy for vector quantization of the reflection coefficients (ri), which combines high coding efficiency, low codebook search complexity, and low storage requirements. A computationally streamlined version of a zero-pole spectral noise weighting function is implemented. An adaptive pitch prefilter and an adaptive spectral postfilter are used to improve the speech coder's performance for both the tandemed and non-tandemed cases.

Full Paper

Bibliographic reference.  Gerson, Ira A. / Jasiuk, Mark A. (1993): "A 5600 BPS VSELP speech coder candidate for half-rate GSM", In EUROSPEECH'93, 253-256.