METHOD AND DEVICE FOR SPEECH scalable coding, resistance to frame loss, With multi-pulse excitation and variable bit rate packet switching for networks

摘要

FIELD: information technology.;SUBSTANCE: in the method for multilevel frequency band and transmission speed scalable speech encoding based on "synthesis analysis", parameters of the multipulse excitation source and the synthesis filter are encoded for each speech frame or subframe. The method involves encoding the base level and encoding one or more enhancement levels. Parameters of the synthesis filter are determined only once at the analysis step when encoding the base level, and these parameters are then encoded such that only the base part of the speech signal can be reconstructed with given quality in a defined limited part of the frequency band of the signal, and on at least one subsequent encoding enhancement level, said part of the frequency band is expanded.;EFFECT: high speech quality and providing tolerance to loss of speech frames transmitted in a packet switched network.;9 cl, 10 dwg