Efficient block coding methods for LPC information play an essential role in very-low-rate speech coding systems. The subject of this contribution is a suboptimal matrix quantization scheme for LPC parameters, called matrix product quantization (MPQ), operating at bit rates between 300 and 750 b/s. In fixed-rate coding systems for mobile communication, MPQ achieves a very high coding efficiency at a low coding delay. Moreover, this paper shows that MPQ is an excellent candidate for mobile speech communication systems in terms of complexity and bit error sensitivity.
Bibliographic reference. Bruhn, Stefan (1995): "MATRIX PRODUCT QUANTIZATION FOR VERY-LOW-RATE MOBILE SPEECH COMMUNICATIONS", In EUROSPEECH-1995, 1053-1056.