METHOD AND APPARATUS FOR DETECTING VOCAL DATA FLOW IN A PACKET DATA FLOW

摘要

The invention concerns a method and an apparatus for detecting vocal data flow in a packet data flow characterised by at least two measurable variables (X5Y). A distribution function (P{x l C}, P{ y I C}) is provided of the values of each variable (X5Y) in a vocal data flow, and the values (x,y) of each variable (X,Y) are measured in order to obtain a sequence of measured values (x^(k), y ^(k)) on a number (k) of blocks. Each measured value (x ^(k), y ^(k)) is therefore applied to the respective distribution function (P{x l C}, P{ yI C}) in order to generate a sequence of likelihood values Formula (I) from which respective average likelihood values (E [B_x ],E[B_y]) are generated. The average values are processed in order to generate a reference likelihood value (B ) which, when compared with a threshold likelihood value (B_min) enables the presence of vocal data flow in a packet data flow to be detected.