Contrast Study on Speech Coding Techniques Between 3GPP AMR-NB and ITU-T G.729A Standards
Hao Xu · Audio Engineering · 2009
The characteristics of AMR-NB and G.729A speech coding standards and their own algorithms are introduced, then 4 aspects of LP(Linear Prediction) analysis, pitch detection, searching of algebraic codebook and quantization of gains in both the standards are compared. In the LP analysis, the differences in the windows, the quantization and interpolation of LSP(Linear Spectral Pairs)are mainly described. In the comparison of pitch detection, the differences between open-loop and close-loop pitch detection of the two standards are analyzed. Besides, the differences in the structure of codebooks and searching algorithm as well as the quantization of gains are betrayed. Finally, the results of performance tests of speech quality, computational and space complexity of the two standards are given.