Analysis/Synthesis and Analysis by Synthesis Schemes - Introduction to Data Compression - page 611

Pre−

processing

LP Analysis

Quantization

Interpolation

Fixed

codebook

G

C Synthesis

filter

Adaptive
codebook

G

P

Pitch
analysis

Perceptual

weighting

Fixed
codebook
search

Gain Parameter

Encoding quantization

F I GU R E 18 . 11 Steps in the encoding of speech for the ITU-T G.729 encoder.

first subframe are taken to be the average of the LSP values computed for this frame and the
LSP values computed for the previous frame.