Spectral distortion in G.729 due to LPC quantization
G. Radha Krishna, M. Banerjee, B.A. Vani · 2003
In the G.729 speech coder, linear predictive coding (LPC) parameters are converted into line spectral frequencies (LSF) and then quantized. Spectral distortion, due to quantization error at various stages is calculated by using the log spectral distortion (LSD) measure.