A long history quantization approach to scalar and vector quantization of LSP coefficients

LHQ (long history quantization), when applied in conjunction with scalar quantization for the coding of LSP (line spectrum pair) coefficients in a CELP (code excited linear prediction) system, offers transparent quantization at an average bit rate of 25 bits/frame. Certain improvements to the LHQ-scalar quantization scheme are presented which further reduce the average LSP bit rate to about 22 bits/frame. In addition, a novel LHQ-vector quantization scheme is proposed, which allows the transparent quantization of LPC coefficients with only 19 bits/analysis frame.<>