CELP Base-Band Coder For High Quality Speech
Ahmet M. KONDOZ, B.G. Evans · 1988
y CELP [l] has proved that it is possible to use vector ions as large as 40 or more samples long and still maingh quality. This is achieved by error minimization n the original and the synthesized vectors, rather than inimization between the residual vectors and code-book in earlier VQ designs. The CELP design however, is ex and its quality is affected very much by the n error of the LPC parameters [2] making it difficult new vector quantized and easily implementer (CELP-BB) which was originally proposed below 4.8 Kb/s in [3]. Because most of the rformed on the base-band which is decimated, and that during code-book search only the pitch filter response -BB is very much less affected by LPC quantLP. CELP-BB can proo the original) down to ty starts to deteriorate natural and intelligible