Multicodebook vector quantization of LPC parameters

This paper presents a novel and efficient variable bit rate LPC quantization approach. The proposed MCVQ framework allows a dynamic programming based minimum quantization distortion partitioning and quantization process to be performed on input LSP vector tracks in time. Variable duration segments of LSP vector tracks are classified into one of a finite number of language related events. Specific codebooks, designed optimally for each event type, are then employed to vector quantize the individual LSP vectors of a given segment. “high quality” LSP quantization can be easily achieved at an average of 700 bits/sec while “transparent” performance is obtained at an average rate of 800 bits/sec