Patent ID: 7716045
Filing Date: 2010-05-11
Classification: G10L

Abstract:
1. A method of coding and decoding speech for voice communications using a vocoder with very low bit rate comprising an analysis part for the coding and the transmission of the parameters of the speech signal, such as the voicing information per sub-band, the pitch, the gains, the LSF spectral parameters and a synthesis part for the reception and the decoding of the parameters transmitted and the reconstruction of the speech signal comprising executing the following steps on an audio processor: grouping together the voicing parameters, pitch, gains, LSF coefficients over N consecutive frames to form a superframe, performing a vector quantization of the voicing information for each superframe by formulating a classification using the information on the chaining in terms of voicing existing over a sub-multiple of N consecutive elementary frames, the voicing information makes it possible specifically to identify classes of sounds for which the allocation of the bit rate and the associated dictionaries will be optimized, the classification is performed on voicing classes over a horizon of 2 elementary frames, the classes are 6 in number and include: coding the pitch, the gains and the LSF coefficients by using the classification obtained.