method and device for determining the gradient of a sprachparameters, for example the fundamental frequency in a speech signal.

摘要

In a method and system for determining the variation of a speech parameter, for example the pitch, in a speech signal, values ms(i,j) and coupling vectors v(i,j) are calculated for time instants i and a number of values j of the speech parameter fj for each time instant i by means of an optimisation algorithm. Of the values ms(m,j) associated with the last time instant i=m, the optimum (that is to say the smallest or, on the contrary, the largest) value is determined. By means of the coupling vectors, the variation of the speech parameter as a function of time can be obtained by means of back-tracking. In the calculation of the values ms(i,j), inter alia, a cost parameter k is taken into account which is a measure of the deviation of the speech parameter fj(i) at the time instant i with respect to a predicted value for the speech parameter at that time instant i.