Test verification of LD-CELP: an objective measurement approach for a non-bit exact standard

2 January 2003

conference paper
Published by Institute of Electrical and Electronics Engineers (IEEE)

p. 1714-1718
https://doi.org/10.1109/glocom.1992.276678

Abstract

A verification test procedure for the low-delay code-excited linear predictive (LD-CELP) speech coder which is expected to be adopted as CCITT Recommendation G.728 for universal applications of speech coding at 16 kb/s is presented. Unlike previous CCITT G-Series Recommendations, LD-CELP is not a bit exact specification. It is written for implementation in 32 bit floating point arithmetic on any of a number of commercially available floating point digital signal processor chips or for simulation in a high-level language such as C or Fortran. In spite of the differing precision of these implementations and simulations, it has been possible to achieve interoperability with a high degree of fidelity among all of them. The motivation for creating an objective measure-based verification procedure, the methodology for creating test vectors, and some results for the test vector set created when applied to five different implementations or simulations are discussed.

Keywords

This publication has 2 references indexed in Scilit:

Code-excited linear prediction(CELP): High-quality speech at very low bit rates
Published by Institute of Electrical and Electronics Engineers (IEEE) ,2005
A low-delay CELP coder for the CCITT 16 kb/s speech coding standard
IEEE Journal on Selected Areas in Communications, 1992