Method for quantifying an ultra low-rate speech encoder

Abstract From the Canadian patent

The inventive method for speech encoding and decoding for voice communications uses an ultra-low rate vocoder comprising an analysing section for encoding and transmitting speech signal parameters such as vocalising information by a subband pitch, gains, LSF special parameters and a synthesis section for receiving and decoding transmitted parameters and reconstructing the speech signal. Said method consists in assembling vocalisation parameters pitch, gains, LSF coefficients on N consecutive frames for forming a super frame in carrying out a vector quantification of vocalising information during each super frame by producing a classification using information chain in vocalisation terms …