Analysis and quantization procedures for a real-time implementation of a 4.8 kb/s CELP coder
Francisco Javier Casajus-Quiros, Luis A. Hernández Gómez, Carmén García Mateo · International Conference on Acoustics, Speech, and Signal Processing · 2002
The main results from work on analysis techniques and quantization procedures for real-time implementation of the Proposed Federal Standard 1016 4800-b/s voice coder developed by the US DoD and AT&T Bell Laboratories are presented. Reduced search procedures are described for the adaptive and stochastic codebooks, two basic functions in code-excited linear predictive coders (CELPs), where great computational effort is required. An efficient procedure for the joint computation and quantization of the line spectrum pair (LSP) is also proposed. Details about a preliminary real-time implementation on a commercial board with a single DSP32C processor are described.>