Abstract: An error concealment method is for improving the speech signal quality at the receiving end in speech transmission systems is described particularly, it relates to a method of receiving speech signals which have been encoded through speech parameters before transmission via a transmission channel, the method comprising an error detection step, using parameter statistics, of detecting corrupted parameters among received parameters and a speech decoding step of decoding the received parameters and retrieving the transmitted speech signal. Depending on the calculation process performed by the speech coder for generating the speech parameters, a pitch doubling/halving of the parameter values may occur during speech parameter coding. Although this phenomenon has no consequence for the received signal quality, it may cause a misdetection by error concealment methods using parameter statistics.