Robust speaker recognition

The techniques described herein compensate for effects which arise from the usage of different compression techniques. A database is provided which stores a mean error signal for each of different compression techniques which may have been applied to a source signal. When an input signal stemming from a certain source signal and coded according to a certain compression technique is received, said certain compression technique is identified and an input pattern signal is determined from the received coded input signal. Then, the stored mean error signal of the recognized compression technique is added to the determined input pattern signal, thereby obtaining an enhanced input pattern signal.