The speech parameter characteristic is divided into successive segments, with a value for the basic frequency within each segment provided using an arrange magnitude difference function. The periodic characteristic for the sequence of diagonally adjacent speech parameters with individual values close to the extreme values is obtained and the min sum of the individual values is provided for each sequence. The sum is increased for diagonal or vertical sections to obtain a horizontal characteristic under the control of fixed values controlling the smoothing of the characteristic. 
VERFAHREN ZUR BESTIMMUNG DES ZEITLICHEN VERLAUFS EINES SPRACHPARAMETERS UND ANORDNUNG ZUR DURCHFUEHRUNG DES VERFAHRENS.