Comparison of intraframe and interframe LSF quantization in packet networks

The standard ITU-T G729 coder uses an interframe quantization of the LSF parameters which causes error propagation to the next frames. We propose the use of intraframe quantization schemes to overcome this problem. We give a performance comparison between intraframe and interframe quantization methods of LSF parameters for ITU-T G729. Simulations results show that our intraframe quantization method achieve smaller average spectral distortions than interframe quantization embedded in the G729. Spectral distortion, Enhanced modified bark spectral distortion (EMBSD) and PESQ tests under various packet loss conditions confirm that the proposed methods are superior to the interframe algorithm embedded in the G729.