SPEECH CODING APPARATUS

摘要

SPEECH CODING APPARATUS A speech coding apparatus including multipliers and prediction filters which successively process a plurality of signal vectors obtained from an index 2M and dimension N code book to obtain a reproduced speech signal; error detectors which find the error between the input speech signal and reproduced speech signal; and evaluators which calculate the optimum signal vectors giving the smallest errors, wherein the multipliers are connected to a reduced code book, which reduced code book is constituted of n number of code book blocks of index 2M/n and dimension N/n (where n is an integer of two or more) and wherein there are n number of multipliers, n number of prediction filters, n number of error detectors, and n number of evaluators corresponding to the code book blocks.