The bit rate for the speech and channel coder for the haprate GSM channel is 11400 bps. A 5600 bps VSELP speech coder designed for this application is &scribed. 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 refection 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 prej5lter and an adaptive spectral jwsgfilter are used to improve the speech coder's performance for both the t&rnedandnon-&medcases.
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