ITU-T G.728 PDF

Introduction

This Recommendation contains the description of an algorithm for the coding of speech signals at 16 kbit/s using low-delay code excited linear prediction (LD-CELP). This Recommendation is organized as follows.

In clause 2 a brief outline of the LD-CELP algorithm is given. In clauses 3 and 4, the LD-CELP encoder and LD-CELP decoder principles are discussed, respectively. In clause 5, the computational details pertaining to each functional algorithmic block are defined. Annexes A, B, C and D contain tables of constants used by the LD-CELP algorithm. In Annex E the sequencing of variable adaptation and use is given. Finally, in Appendix I information is given on procedures applicable to the implementation verification of the algorithm.

Under further study is the future incorporation of three additional appendices (to be published separately) consisting of LD-CELP network aspects, LD-CELP fixed-point implementation description, and LD-CELP fixed-point verification procedures.