Predictive quantization of spectral amplitudes for harmonic coders
R. Prased, Wui-Yip Chan · 2002
We present a novel predictive vector quantization scheme for coding the variable-dimension spectral amplitude vectors produced by harmonic coders. The scheme has a safety-net prediction structure, but it uses analysis-by-synthesis codebook search. A "closed-loop" codebook design algorithm is devised. Significant improvement over conventional predictive VQ design methods is obtained.