两种可分级语音编码器的量化器

G.718
ISF MSVQ multi-stage vector quantization
shape-gain VQ
shape: Multi-Rate Lattice Vector Quantization
G.729.1
TDBWE Layer 3
mean-removed split vector quantization
TDAC Layer 4~12
MDCT spectral envelope gain-shape vector quantization
gain : log_rms
shape: embedded(split) spherical vector quantization