System for embedded coding of speech signals

Details System for embedded coding of speech signals System for embedded coding of speech signals

G - Physics

10

L

G10L 19/12 (2006.01) G10L 19/00 (2006.01)

Patent

CA 2057384

Embedded coding within coded speech signals of a signal flow having a lower bit rate is provided for signals produced by analysis-by-synthesis coding systems such as CELP. The excitation chosen for coding at a transmitter has contributions provided by several excitation branches, a first of which provides a contribution allowing transmission at a minimum bit rate, whilst the other branches provide contributions permitting successively higher bit rates. During coding, only the excitation from the first branches is filtered taking into account the coding of previous frames, and the contributions from different branches are inserted into different distinguishable packets. During transmission through a network, any necessary packet dropping is implemented first in relation to packets containing the contribution permitting the highest bit rate, and then on packets containing contribution necessary for successively lower bit rates, but always leaving the packets containing the contribution from the first branch. During reception, the excitation submitted to the filter for decoding includes contributions from a first excitation branch corresponding to the first branch at the transmitting, and from other branches corresponding to contributions represented in the received packets if received at a rate permitting more than the minimum bit rate. Again, only the filtering of the continuation from the first excitation branch taken into account the results of filtering of preceding claims.

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